{"id":1616,"date":"2025-03-24T08:50:15","date_gmt":"2025-03-23T23:50:15","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1616"},"modified":"2025-03-24T08:50:15","modified_gmt":"2025-03-23T23:50:15","slug":"c%e3%83%9e%e3%83%83%e3%83%97%e3%82%92%e5%ae%8c%e5%85%a8%e7%90%86%e8%a7%a3%ef%bc%81%e5%9f%ba%e6%9c%ac%e3%81%8b%e3%82%89%e5%ae%9f%e8%b7%b5%e3%81%be%e3%81%a7%e8%a7%a3%e8%aa%ac%e3%81%99%e3%82%8b7","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1616","title":{"rendered":"C++\u30de\u30c3\u30d7\u3092\u5b8c\u5168\u7406\u89e3\uff01\u57fa\u672c\u304b\u3089\u5b9f\u8df5\u307e\u3067\u89e3\u8aac\u3059\u308b7\u3064\u306e\u5fc5\u9808\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">C++ \u30de\u30c3\u30d7\u3068\u306f\uff1fSTL \u30b3\u30f3\u30c6\u30ca\u306e\u9b45\u529b\u3092\u5fb9\u5e95\u89e3\u8aac<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u9023\u60f3\u914d\u5217\u3068\u3057\u3066\u4f7f\u3048\u308b C++ \u30de\u30c3\u30d7\u306e\u57fa\u672c\u6982\u5ff5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">\u4ed6\u306e\u914d\u5217\u3084\u30b3\u30f3\u30c6\u30ca\u3068\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">C++ \u30de\u30c3\u30d7\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3088\u3046<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u8981\u7d20\u306e\u8ffd\u52a0\u3068\u524a\u9664\u3092\u52b9\u7387\u7684\u306b\u884c\u3046\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u3092\u81ea\u5728\u306b\u64cd\u4f5c\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u3092\u4f7f\u3063\u305f\u52b9\u7387\u7684\u306amap\u64cd\u4f5c<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">\u5b9f\u8df5\u3067\u6d3b\u304d\u308b\uff01map\u306e\u9ad8\u5ea6\u306a\u4f7f\u3044\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">\u30ab\u30b9\u30bf\u30e0\u30ad\u30fc\u3092\u4f7f\u3063\u305fmap\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-9\">\u8907\u5408\u30c7\u30fc\u30bf\u69cb\u9020\u3067map\u3092\u6d3b\u7528\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-10\">\u30b9\u30ec\u30c3\u30c9\u30de\u30eb\u30c1\u74b0\u5883\u3067\u306e\u5b89\u5168\u306amap\u64cd\u4f5c<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-11\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-12\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u8003\u3048\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">\u691c\u7d22\u30fb\u633f\u5165\u64cd\u4f5c\u306e\u901f\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-14\">C++ \u30de\u30c3\u30d7\u306e\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-15\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u305f\u3081\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-16\">\u30a4\u30c6\u30ec\u30fc\u30bf\u6709\u52b9\u5316\u306e\u7f60\u3068\u5bfe\u7b56\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-17\">\u5b9f\u52d9\u3067\u4f7f\u3048\u308b\uff01\u30de\u30c3\u30d7\u306e\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-18\">\u30ad\u30e3\u30c3\u30b7\u30e5\u30b7\u30b9\u30c6\u30e0\u306e\u5b9f\u88c5\u4f8b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u30b0\u30e9\u30d5\u69cb\u9020\u306e\u5b9f\u88c5\u306b\u304a\u3051\u308bmap\u6d3b\u7528\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-20\">C++ \u30de\u30c3\u30d7\u306e\u4ee3\u66ff\u624b\u6bb5\u3068\u6d3b\u7528<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-21\">unordered_map\u3068\u306e\u6bd4\u8f03\u3068\u6b63\u3057\u3044\u9078\u629e\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-22\">\u4ed6\u306eSTL\u30b3\u30f3\u30c6\u30ca\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u6d3b\u7528\u8853<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">C++ \u30de\u30c3\u30d7\u3068\u306f\uff1fSTL \u30b3\u30f3\u30c6\u30ca\u306e\u9b45\u529b\u3092\u5fb9\u5e95\u89e3\u8aac<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u9023\u60f3\u914d\u5217\u3068\u3057\u3066\u4f7f\u3048\u308b C++ \u30de\u30c3\u30d7\u306e\u57fa\u672c\u6982\u5ff5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C++\u306emap\uff08\u30de\u30c3\u30d7\uff09\u306f\u3001Standard Template Library (STL)\u304c\u63d0\u4f9b\u3059\u308b\u9023\u60f3\u30b3\u30f3\u30c6\u30ca\u306e\u4e00\u3064\u3067\u3059\u3002\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u3092\u683c\u7d0d\u3067\u304d\u308b\u5f37\u529b\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u3092\u6301\u3063\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30ad\u30fc\u306b\u3088\u308b\u81ea\u52d5\u30bd\u30fc\u30c8<\/strong>: \u8981\u7d20\u306f\u5e38\u306b\u30ad\u30fc\u306e\u9806\u5e8f\u3067\u81ea\u52d5\u7684\u306b\u30bd\u30fc\u30c8\u3055\u308c\u307e\u3059<\/li>\n\n\n\n<li><strong>\u30e6\u30cb\u30fc\u30af\u306a\u30ad\u30fc<\/strong>: \u540c\u3058\u30ad\u30fc\u3092\u6301\u3064\u8981\u7d20\u306f1\u3064\u3057\u304b\u5b58\u5728\u3067\u304d\u307e\u305b\u3093<\/li>\n\n\n\n<li><strong>\u52b9\u7387\u7684\u306a\u691c\u7d22<\/strong>: \u5e73\u5747\u7684\u306a\u691c\u7d22\u6642\u9593\u306f O(log n) \u3067\u3059<\/li>\n\n\n\n<li><strong>\u52d5\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406<\/strong>: \u8981\u7d20\u6570\u306b\u5fdc\u3058\u3066\u81ea\u52d5\u7684\u306b\u30e1\u30e2\u30ea\u3092\u78ba\u4fdd\u30fb\u89e3\u653e\u3057\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;string&gt;\n#include &lt;iostream&gt;\n\nint main() {\n    \/\/ string\u578b\u306e\u30ad\u30fc\u3068int\u578b\u306e\u5024\u3092\u6301\u3064\u30de\u30c3\u30d7\u3092\u4f5c\u6210\n    std::map&lt;std::string, int&gt; scores;\n\n    \/\/ \u8981\u7d20\u306e\u8ffd\u52a0\n    scores[\"Alice\"] = 100;  \/\/ \u30ad\u30fc: \"Alice\", \u5024: 100\n    scores[\"Bob\"] = 85;     \/\/ \u30ad\u30fc: \"Bob\", \u5024: 85\n\n    \/\/ \u8981\u7d20\u3078\u306e\u30a2\u30af\u30bb\u30b9\n    std::cout &lt;&lt; \"Alice\u306e\u30b9\u30b3\u30a2: \" &lt;&lt; scores[\"Alice\"] &lt;&lt; std::endl;\n\n    return 0;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u4ed6\u306e\u914d\u5217\u3084\u30b3\u30f3\u30c6\u30ca\u3068\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">map\u3068\u4ed6\u306eSTL\u30b3\u30f3\u30c6\u30ca\u306b\u306f\u3001\u305d\u308c\u305e\u308c\u7279\u5fb4\u7684\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u8868\u3067\u4e3b\u306a\u9055\u3044\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n<div id=\"id-e1a32e9a-b51a-45ac-85a3-5827cc027e83\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4<\/th><th>std::map<\/th><th>std::vector<\/th><th>std::array<\/th><\/tr><\/thead><tbody><tr><td>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u65b9\u5f0f<\/td><td>\u30ad\u30fc\u306b\u3088\u308b\u30a2\u30af\u30bb\u30b9<\/td><td>\u6570\u5024\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/td><td>\u6570\u5024\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u5272\u308a\u5f53\u3066<\/td><td>\u52d5\u7684<\/td><td>\u52d5\u7684<\/td><td>\u9759\u7684<\/td><\/tr><tr><td>\u8981\u7d20\u306e\u9806\u5e8f<\/td><td>\u30ad\u30fc\u3067\u30bd\u30fc\u30c8\u6e08\u307f<\/td><td>\u633f\u5165\u9806<\/td><td>\u633f\u5165\u9806<\/td><\/tr><tr><td>\u691c\u7d22\u6642\u9593<\/td><td>O(log n)<\/td><td>O(n)<\/td><td>O(n)<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u52b9\u7387<\/td><td>\u4e2d<\/td><td>\u9ad8<\/td><td>\u6700\u9ad8<\/td><\/tr><tr><td>\u8981\u7d20\u306e\u8ffd\u52a0\/\u524a\u9664<\/td><td>\u52b9\u7387\u7684<\/td><td>\u672b\u5c3e\u306a\u3089\u52b9\u7387\u7684<\/td><td>\u4e0d\u53ef<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">map\u304c\u7279\u306b\u512a\u308c\u3066\u3044\u308b\u7528\u9014\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7684\u306a\u4f7f\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   std::map&lt;std::string, UserInfo&gt; users;  \/\/ \u30e6\u30fc\u30b6\u30fcID\u3067\u691c\u7d22\u53ef\u80fd\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30ab\u30a6\u30f3\u30bf\u30fc\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   std::map&lt;std::string, int&gt; wordCount;  \/\/ \u5358\u8a9e\u306e\u51fa\u73fe\u56de\u6570\u30ab\u30a6\u30f3\u30c8<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b7\u30b9\u30c6\u30e0<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   std::map&lt;int, ComputationResult&gt; cache;  \/\/ \u8a08\u7b97\u7d50\u679c\u306e\u30ad\u30e3\u30c3\u30b7\u30e5<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">map\u306e\u5185\u90e8\u5b9f\u88c5\u306f\u901a\u5e38\u3001Red-Black\u6728\u3068\u3044\u3046\u81ea\u5df1\u5e73\u8861\u4e8c\u5206\u63a2\u7d22\u6728\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u306b\u3088\u3063\u3066\u52b9\u7387\u7684\u306a\u691c\u7d22\u30fb\u633f\u5165\u30fb\u524a\u9664\u64cd\u4f5c\u3092\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u5b9f\u88c5\u306b\u3088\u308a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u6027\u304c\u4fdd\u8a3c\u3055\u308c\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u691c\u7d22\u3001\u633f\u5165\u3001\u524a\u9664\u306e\u64cd\u4f5c\u6642\u9593\u304c\u5e38\u306b O(log n)<\/li>\n\n\n\n<li>\u30ad\u30fc\u306b\u3088\u308b\u7bc4\u56f2\u691c\u7d22\u304c\u5bb9\u6613<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306f\u8981\u7d20\u6570\u306b\u6bd4\u4f8b<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u7279\u5fb4\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u30b3\u30f3\u30c6\u30ca\u3092\u9078\u629e\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001map\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">C++ \u30de\u30c3\u30d7\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3088\u3046<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u8981\u7d20\u306e\u8ffd\u52a0\u3068\u524a\u9664\u3092\u52b9\u7387\u7684\u306b\u884c\u3046\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">map\u3067\u306e\u8981\u7d20\u64cd\u4f5c\u306f\u76f4\u611f\u7684\u3067\u4f7f\u3044\u3084\u3059\u304f\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u52b9\u7387\u7684\u306b\u4f7f\u3046\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u30c6\u30af\u30cb\u30c3\u30af\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. \u8981\u7d20\u306e\u8ffd\u52a0<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;string&gt;\n\nint main() {\n    std::map&lt;std::string, int&gt; scores;\n\n    \/\/ \u65b9\u6cd51: operator[] \u3092\u4f7f\u7528\n    scores[\"Alice\"] = 100;  \/\/ \u65b0\u898f\u8ffd\u52a0\n    scores[\"Alice\"] = 95;   \/\/ \u65e2\u5b58\u306e\u5024\u3092\u66f4\u65b0\n\n    \/\/ \u65b9\u6cd52: insert() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\n    scores.insert(std::make_pair(\"Bob\", 85));  \/\/ \u65b0\u898f\u8ffd\u52a0\n\n    \/\/ \u65b9\u6cd53: emplace() \u3092\u4f7f\u7528\uff08\u6700\u3082\u52b9\u7387\u7684\uff09\n    scores.emplace(\"Charlie\", 90);  \/\/ \u65b0\u898f\u8ffd\u52a0\n\n    return 0;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. \u8981\u7d20\u306e\u524a\u9664<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30ad\u30fc\u3092\u6307\u5b9a\u3057\u3066\u524a\u9664\nscores.erase(\"Alice\");  \/\/ \"Alice\"\u306e\u30a8\u30f3\u30c8\u30ea\u3092\u524a\u9664\n\n\/\/ \u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u3066\u524a\u9664\nauto it = scores.find(\"Bob\");\nif (it != scores.end()) {\n    scores.erase(it);  \/\/ \"Bob\"\u306e\u30a8\u30f3\u30c8\u30ea\u3092\u524a\u9664\n}\n\n\/\/ \u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u524a\u9664\uff08C++17\u4ee5\u964d\uff09\nstd::erase_if(scores, [](const auto&amp; pair) {\n    return pair.second &lt; 60;  \/\/ 60\u70b9\u672a\u6e80\u306e\u8981\u7d20\u3092\u524a\u9664\n});<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u3092\u81ea\u5728\u306b\u64cd\u4f5c\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">map\u306e\u8981\u7d20\u3092\u52b9\u7387\u7684\u306b\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u3044\u304f\u3064\u304b\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. \u5b89\u5168\u306a\u30a2\u30af\u30bb\u30b9\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">std::map&lt;std::string, int&gt; data;\n\n\/\/ at()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\uff08\u5b58\u5728\u3057\u306a\u3044\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3068\u4f8b\u5916\u3092\u6295\u3052\u308b\uff09\ntry {\n    int value = data.at(\"key\");\n} catch (const std::out_of_range&amp; e) {\n    std::cout &lt;&lt; \"\u30ad\u30fc\u304c\u5b58\u5728\u3057\u307e\u305b\u3093\" &lt;&lt; std::endl;\n}\n\n\/\/ find()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\uff08\u5b58\u5728\u78ba\u8a8d\u304c\u53ef\u80fd\uff09\nauto it = data.find(\"key\");\nif (it != data.end()) {\n    int value = it-&gt;second;\n} else {\n    std::cout &lt;&lt; \"\u30ad\u30fc\u304c\u5b58\u5728\u3057\u307e\u305b\u3093\" &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30ad\u30fc\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\nint value = data.value_or(\"key\", 0);  \/\/ \u30ad\u30fc\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f0\u3092\u8fd4\u3059<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u3092\u4f7f\u3063\u305f\u52b9\u7387\u7684\u306amap\u64cd\u4f5c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001map\u306e\u8981\u7d20\u3092\u52b9\u7387\u7684\u306b\u8d70\u67fb\u3067\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">std::map&lt;std::string, int&gt; scores;\n\n\/\/ \u901a\u5e38\u306e\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\nfor (const auto&amp; [key, value] : scores) {  \/\/ C++17\u306e\u69cb\u9020\u5316\u675f\u7e1b\u3092\u4f7f\u7528\n    std::cout &lt;&lt; key &lt;&lt; \": \" &lt;&lt; value &lt;&lt; std::endl;\n}\n\n\/\/ \u7279\u5b9a\u306e\u7bc4\u56f2\u306e\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\nauto start = scores.lower_bound(\"B\");  \/\/ \"B\"\u4ee5\u964d\u3067\u6700\u521d\u306e\u8981\u7d20\nauto end = scores.upper_bound(\"D\");    \/\/ \"D\"\u3088\u308a\u5927\u304d\u3044\u6700\u521d\u306e\u8981\u7d20\n\nfor (auto it = start; it != end; ++it) {\n    std::cout &lt;&lt; it-&gt;first &lt;&lt; \": \" &lt;&lt; it-&gt;second &lt;&lt; std::endl;\n}\n\n\/\/ \u9006\u9806\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\nfor (auto it = scores.rbegin(); it != scores.rend(); ++it) {\n    std::cout &lt;&lt; it-&gt;first &lt;&lt; \": \" &lt;&lt; it-&gt;second &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u8df5\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5024\u306e\u5b58\u5728\u78ba\u8a8d\u3068\u633f\u5165\u306e\u7d44\u307f\u5408\u308f\u305b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">auto [it, inserted] = scores.insert_or_assign(\"Dave\", 95);\nif (inserted) {\n    std::cout &lt;&lt; \"\u65b0\u3057\u3044\u8981\u7d20\u3092\u633f\u5165\u3057\u307e\u3057\u305f\" &lt;&lt; std::endl;\n} else {\n    std::cout &lt;&lt; \"\u65e2\u5b58\u306e\u8981\u7d20\u3092\u66f4\u65b0\u3057\u307e\u3057\u305f\" &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u8907\u6570\u306e\u5024\u3092\u52b9\u7387\u7684\u306b\u633f\u5165<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">std::map&lt;std::string, int&gt; newScores;\nnewScores.insert(scores.begin(), scores.end());  \/\/ \u5225\u306emap\u306e\u8981\u7d20\u3092\u307e\u3068\u3081\u3066\u633f\u5165<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u57fa\u672c\u64cd\u4f5c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001map\u3092\u52b9\u7387\u7684\u306b\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">\u5b9f\u8df5\u3067\u6d3b\u304d\u308b\uff01map\u306e\u9ad8\u5ea6\u306a\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u30ab\u30b9\u30bf\u30e0\u30ad\u30fc\u3092\u4f7f\u3063\u305fmap\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">map\u306e\u771f\u306e\u529b\u3092\u5f15\u304d\u51fa\u3059\u306b\u306f\u3001\u30ab\u30b9\u30bf\u30e0\u30ad\u30fc\u306e\u5b9f\u88c5\u304c\u91cd\u8981\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u52b9\u679c\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;string&gt;\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u30ad\u30fc\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u30af\u30e9\u30b9\nclass UserKey {\npublic:\n    UserKey(std::string id, std::string department) \n        : id_(id), department_(department) {}\n\n    \/\/ operator&lt; \u306e\u5b9f\u88c5\uff08\u5fc5\u9808\uff09\n    bool operator&lt;(const UserKey&amp; other) const {\n        \/\/ \u90e8\u7f72\u3067\u7b2c\u4e00\u30bd\u30fc\u30c8\u3001ID\u3067\u7b2c\u4e8c\u30bd\u30fc\u30c8\n        if (department_ != other.department_) {\n            return department_ &lt; other.department_;\n        }\n        return id_ &lt; other.id_;\n    }\n\n    \/\/ \u30b2\u30c3\u30bf\u30fc\u30e1\u30bd\u30c3\u30c9\n    std::string getId() const { return id_; }\n    std::string getDepartment() const { return department_; }\n\nprivate:\n    std::string id_;\n    std::string department_;\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nint main() {\n    \/\/ UserKey\u3092\u30ad\u30fc\u3068\u3057\u3066\u4f7f\u7528\u3059\u308bmap\n    std::map&lt;UserKey, std::string&gt; userMap;\n\n    \/\/ \u8981\u7d20\u306e\u8ffd\u52a0\n    userMap.emplace(UserKey(\"001\", \"Engineering\"), \"Alice\");\n    userMap.emplace(UserKey(\"002\", \"Engineering\"), \"Bob\");\n    userMap.emplace(UserKey(\"001\", \"Marketing\"), \"Charlie\");\n\n    \/\/ \u90e8\u7f72\u3068ID\u3067\u81ea\u52d5\u7684\u306b\u30bd\u30fc\u30c8\u3055\u308c\u308b\n    for (const auto&amp; [key, value] : userMap) {\n        std::cout &lt;&lt; \"Department: \" &lt;&lt; key.getDepartment() \n                  &lt;&lt; \", ID: \" &lt;&lt; key.getId()\n                  &lt;&lt; \", Name: \" &lt;&lt; value &lt;&lt; std::endl;\n    }\n\n    return 0;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u8907\u5408\u30c7\u30fc\u30bf\u69cb\u9020\u3067map\u3092\u6d3b\u7528\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3059\u308b\u305f\u3081\u306b\u3001map\u3092\u6d3b\u7528\u3059\u308b\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;vector&gt;\n#include &lt;string&gt;\n#include &lt;memory&gt;\n\n\/\/ \u30cd\u30b9\u30c8\u3055\u308c\u305fmap\u69cb\u9020\u306e\u4f8b\nclass OrganizationStructure {\nprivate:\n    \/\/ \u90e8\u7f72\u3054\u3068\u306e\u5f93\u696d\u54e1\u30de\u30c3\u30d7\n    std::map&lt;std::string, std::map&lt;std::string, std::vector&lt;std::string&gt;&gt;&gt; organization;\n\npublic:\n    \/\/ \u5f93\u696d\u54e1\u3092\u8ffd\u52a0\n    void addEmployee(const std::string&amp; department, \n                    const std::string&amp; team,\n                    const std::string&amp; employeeName) {\n        organization[department][team].push_back(employeeName);\n    }\n\n    \/\/ \u30c1\u30fc\u30e0\u5185\u306e\u5168\u5f93\u696d\u54e1\u3092\u53d6\u5f97\n    std::vector&lt;std::string&gt; getTeamMembers(const std::string&amp; department,\n                                          const std::string&amp; team) const {\n        auto deptIt = organization.find(department);\n        if (deptIt != organization.end()) {\n            auto teamIt = deptIt-&gt;second.find(team);\n            if (teamIt != deptIt-&gt;second.end()) {\n                return teamIt-&gt;second;\n            }\n        }\n        return std::vector&lt;std::string&gt;();\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u30b9\u30ec\u30c3\u30c9\u30de\u30eb\u30c1\u74b0\u5883\u3067\u306e\u5b89\u5168\u306amap\u64cd\u4f5c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067map\u3092\u5b89\u5168\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306e\u5b9f\u88c5\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;mutex&gt;\n#include &lt;shared_mutex&gt;\n\ntemplate&lt;typename K, typename V&gt;\nclass ThreadSafeMap {\nprivate:\n    std::map&lt;K, V&gt; data;\n    mutable std::shared_mutex mutex;  \/\/ \u8aad\u307f\u66f8\u304d\u30ed\u30c3\u30af\n\npublic:\n    \/\/ \u8981\u7d20\u306e\u8ffd\u52a0\uff08\u66f8\u304d\u8fbc\u307f\u30ed\u30c3\u30af\uff09\n    void insert(const K&amp; key, const V&amp; value) {\n        std::unique_lock&lt;std::shared_mutex&gt; lock(mutex);\n        data[key] = value;\n    }\n\n    \/\/ \u8981\u7d20\u306e\u53d6\u5f97\uff08\u8aad\u307f\u53d6\u308a\u30ed\u30c3\u30af\uff09\n    std::optional&lt;V&gt; get(const K&amp; key) const {\n        std::shared_lock&lt;std::shared_mutex&gt; lock(mutex);\n        auto it = data.find(key);\n        if (it != data.end()) {\n            return it-&gt;second;\n        }\n        return std::nullopt;\n    }\n\n    \/\/ \u8981\u7d20\u306e\u524a\u9664\uff08\u66f8\u304d\u8fbc\u307f\u30ed\u30c3\u30af\uff09\n    bool erase(const K&amp; key) {\n        std::unique_lock&lt;std::shared_mutex&gt; lock(mutex);\n        return data.erase(key) &gt; 0;\n    }\n\n    \/\/ \u5b89\u5168\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\n    template&lt;typename Func&gt;\n    void forEach(Func func) const {\n        std::shared_lock&lt;std::shared_mutex&gt; lock(mutex);\n        for (const auto&amp; [key, value] : data) {\n            func(key, value);\n        }\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nint main() {\n    ThreadSafeMap&lt;std::string, int&gt; scores;\n\n    \/\/ \u8907\u6570\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u306e\u5b89\u5168\u306a\u30a2\u30af\u30bb\u30b9\n    scores.insert(\"Alice\", 100);\n\n    if (auto score = scores.get(\"Alice\")) {\n        std::cout &lt;&lt; \"Score: \" &lt;&lt; *score &lt;&lt; std::endl;\n    }\n\n    scores.forEach([](const std::string&amp; name, int score) {\n        std::cout &lt;&lt; name &lt;&lt; \": \" &lt;&lt; score &lt;&lt; std::endl;\n    });\n\n    return 0;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>std::shared_mutex<\/code>\u3092\u4f7f\u7528\u3057\u3066\u8aad\u307f\u66f8\u304d\u30ed\u30c3\u30af\u3092\u5b9f\u73fe<\/li>\n\n\n\n<li>\u8aad\u307f\u53d6\u308a\u64cd\u4f5c\u306b\u306f\u5171\u6709\u30ed\u30c3\u30af\uff08<code>shared_lock<\/code>\uff09\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u66f8\u304d\u8fbc\u307f\u64cd\u4f5c\u306b\u306f\u6392\u4ed6\u30ed\u30c3\u30af\uff08<code>unique_lock<\/code>\uff09\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u306e\u4e00\u8cab\u6027\u3092\u4fdd\u3061\u306a\u304c\u3089\u4e26\u884c\u30a2\u30af\u30bb\u30b9\u3092\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u3082map\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-11\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u8003\u3048\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">map\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. \u30ea\u30b6\u30fc\u30d6\u30d2\u30f3\u30c8\u306e\u4f7f\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;string&gt;\n\nint main() {\n    std::map&lt;std::string, int&gt; data;\n\n    \/\/ \u4e8b\u524d\u306b\u30ce\u30fc\u30c9\u3092\u78ba\u4fdd\u3057\u3066\u30e1\u30e2\u30ea\u518d\u5272\u308a\u5f53\u3066\u3092\u6e1b\u3089\u3059\n    data.reserve(1000);  \/\/ C++17\u4ee5\u964d\n\n    \/\/ \u30c7\u30fc\u30bf\u8ffd\u52a0\n    for (int i = 0; i &lt; 1000; ++i) {\n        data.emplace(std::to_string(i), i);\n    }\n\n    return 0;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u30ad\u30fc\u8a2d\u8a08<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u60aa\u3044\u4f8b\nstruct IneffiecientKey {\n    std::string longString;\n    std::vector&lt;int&gt; data;\n    \/\/ \u6bd4\u8f03\u6f14\u7b97\u5b50\n    bool operator&lt;(const IneffiecientKey&amp; other) const {\n        return longString &lt; other.longString;\n    }\n};\n\n\/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u4f8b\nstruct EfficientKey {\n    uint64_t hash;  \/\/ \u6587\u5b57\u5217\u306e\u30cf\u30c3\u30b7\u30e5\u5024\n    \/\/ \u6bd4\u8f03\u6f14\u7b97\u5b50\n    bool operator&lt;(const EfficientKey&amp; other) const {\n        return hash &lt; other.hash;\n    }\n};<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. \u30ab\u30b9\u30bf\u30e0\u30a2\u30ed\u30b1\u30fc\u30bf\u306e\u6d3b\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;memory_resource&gt;\n\n\/\/ \u30e1\u30e2\u30ea\u30d7\u30fc\u30eb\u7528\u306e\u30d0\u30c3\u30d5\u30a1\nchar buffer[4096];  \/\/ \u56fa\u5b9a\u30b5\u30a4\u30ba\u306e\u30e1\u30e2\u30ea\u30d7\u30fc\u30eb\n\nint main() {\n    \/\/ \u30e1\u30e2\u30ea\u30d7\u30fc\u30eb\u306e\u4f5c\u6210\n    std::pmr::monotonic_buffer_resource pool{buffer, sizeof(buffer)};\n\n    \/\/ \u30ab\u30b9\u30bf\u30e0\u30a2\u30ed\u30b1\u30fc\u30bf\u3092\u4f7f\u7528\u3059\u308bmap\n    std::pmr::map&lt;int, std::pmr::string&gt; pooledMap{&amp;pool};\n\n    \/\/ \u30e1\u30e2\u30ea\u30d7\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\n    pooledMap.emplace(1, \"test\");\n\n    return 0;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u691c\u7d22\u30fb\u633f\u5165\u64cd\u4f5c\u306e\u901f\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">map\u306e\u64cd\u4f5c\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. \u30d2\u30f3\u30c8\u4ed8\u304d\u633f\u5165\u306e\u6d3b\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">std::map&lt;int, std::string&gt; data;\n\n\/\/ \u52b9\u7387\u7684\u306a\u9010\u6b21\u633f\u5165\nauto it = data.begin();\nfor (int i = 0; i &lt; 1000; ++i) {\n    \/\/ \u633f\u5165\u4f4d\u7f6e\u306e\u30d2\u30f3\u30c8\u3092\u4f7f\u7528\n    it = data.emplace_hint(it, i, std::to_string(i));\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. \u4e0d\u8981\u306a\u30b3\u30d4\u30fc\u306e\u56de\u907f<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class HeavyValue {\n    std::vector&lt;double&gt; largeData;\npublic:\n    HeavyValue(size_t size) : largeData(size) {}\n};\n\nstd::map&lt;int, HeavyValue&gt; data;\n\n\/\/ \u975e\u52b9\u7387\u306a\u65b9\u6cd5\ndata[1] = HeavyValue(1000);  \/\/ \u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30d4\u30fc\u304c\u767a\u751f\n\n\/\/ \u52b9\u7387\u7684\u306a\u65b9\u6cd5\uff08\u305d\u306e\u5834\u3067\u69cb\u7bc9\uff09\ndata.emplace(1, 1000);  \/\/ \u30b3\u30d4\u30fc\u306a\u3057\u3067\u76f4\u63a5\u69cb\u7bc9<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. \u30ce\u30fc\u30c9\u30cf\u30f3\u30c9\u30eb\u306e\u6d3b\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n\n\/\/ \u30ce\u30fc\u30c9\u306e\u62bd\u51fa\u3068\u79fb\u52d5\nstd::map&lt;int, std::string&gt; source;\nstd::map&lt;int, std::string&gt; destination;\n\n\/\/ \u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\nsource.emplace(1, \"one\");\nsource.emplace(2, \"two\");\n\n\/\/ \u30ce\u30fc\u30c9\u3092\u62bd\u51fa\u3057\u3066\u79fb\u52d5\uff08\u30b3\u30d4\u30fc\u306a\u3057\uff09\nauto node = source.extract(1);\ndestination.insert(std::move(node));<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u305f\u3081\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u30a2\u30af\u30bb\u30b9\u30d1\u30bf\u30fc\u30f3\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9023\u7d9a\u3057\u305f\u30ad\u30fc\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u30d2\u30f3\u30c8\u4ed8\u304d\u633f\u5165\u3092\u6d3b\u7528<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u306e\u52b9\u7387\u7684\u306a\u4f7f\u7528\u3092\u8003\u616e<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u6226\u7565<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u983b\u7e41\u306a\u5272\u308a\u5f53\u3066\/\u89e3\u653e\u3092\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u30a2\u30ed\u30b1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u3066\u7279\u5b9a\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306b\u6700\u9069\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u64cd\u4f5c\u306e\u9078\u629e<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>operator[]<\/code> \u3088\u308a\u3082 <code>emplace<\/code> \u3092\u512a\u5148<\/li>\n\n\n\n<li>\u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\u3092\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u30e0\u30fc\u30d6\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\u3092\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001map\u306e\u6027\u80fd\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u904e\u5ea6\u306a\u6700\u9069\u5316\u306f\u53ef\u8aad\u6027\u3092\u640d\u306a\u3046\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u5b9f\u969b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-14\">C++ \u30de\u30c3\u30d7\u306e\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u305f\u3081\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">map\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u5178\u578b\u7684\u306a\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u30d1\u30bf\u30fc\u30f3\u3068\u3001\u305d\u306e\u5bfe\u7b56\u65b9\u6cd5\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5371\u967a\u306a\u30d1\u30bf\u30fc\u30f31: \u751f\u30dd\u30a4\u30f3\u30bf\u306e\u4f7f\u7528\nstd::map&lt;int, MyClass*&gt; dangerousMap;\ndangerousMap[1] = new MyClass();  \/\/ \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u5371\u967a\u6027\n\n\/\/ \u5b89\u5168\u306a\u30d1\u30bf\u30fc\u30f31: \u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u4f7f\u7528\nstd::map&lt;int, std::unique_ptr&lt;MyClass&gt;&gt; safeMap;\nsafeMap[1] = std::make_unique&lt;MyClass&gt;();  \/\/ \u5b89\u5168\u306a\u5b9f\u88c5\n\n\/\/ \u5371\u967a\u306a\u30d1\u30bf\u30fc\u30f32: \u4f8b\u5916\u767a\u751f\u6642\u306e\u30ea\u30fc\u30af\nvoid riskyOperation() {\n    std::map&lt;int, Resource*&gt; resources;\n    resources[1] = new Resource();  \/\/ \u4f8b\u5916\u304c\u767a\u751f\u3059\u308b\u3068\u30ea\u30fc\u30af\n    doSomethingThatMightThrow();  \/\/ \u4f8b\u5916\u767a\u751f\u306e\u53ef\u80fd\u6027\n    delete resources[1];  \/\/ \u4f8b\u5916\u767a\u751f\u6642\u306b\u3053\u3053\u307e\u3067\u5230\u9054\u3057\u306a\u3044\n}\n\n\/\/ \u5b89\u5168\u306a\u30d1\u30bf\u30fc\u30f32: RAII\u306e\u6d3b\u7528\nvoid safeOperation() {\n    std::map&lt;int, std::shared_ptr&lt;Resource&gt;&gt; resources;\n    resources[1] = std::make_shared&lt;Resource&gt;();  \/\/ RAII\u3067\u5b89\u5168\n    doSomethingThatMightThrow();  \/\/ \u4f8b\u5916\u304c\u767a\u751f\u3057\u3066\u3082\u81ea\u52d5\u3067\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u9632\u6b62\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u7a4d\u6975\u7684\u306a\u6d3b\u7528<\/li>\n\n\n\n<li>RAII\u30d1\u30bf\u30fc\u30f3\u306e\u63a1\u7528<\/li>\n\n\n\n<li>\u4f8b\u5916\u5b89\u5168\u6027\u3092\u8003\u616e\u3057\u305f\u8a2d\u8a08<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u306e\u4e00\u5143\u5316<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u30a4\u30c6\u30ec\u30fc\u30bf\u6709\u52b9\u5316\u306e\u7f60\u3068\u5bfe\u7b56\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u7121\u52b9\u5316\u306f\u975e\u5e38\u306b\u5384\u4ecb\u306a\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u306a\u554f\u984c\u30d1\u30bf\u30fc\u30f3\u3068\u5bfe\u7b56\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">std::map&lt;int, std::string&gt; dataMap = {{1, \"one\"}, {2, \"two\"}, {3, \"three\"}};\n\n\/\/ \u5371\u967a\u306a\u30d1\u30bf\u30fc\u30f31: \u8981\u7d20\u524a\u9664\u5f8c\u306e\u7121\u52b9\u306a\u30a4\u30c6\u30ec\u30fc\u30bf\u4f7f\u7528\nauto it = dataMap.begin();\ndataMap.erase(it);  \/\/ \u30a4\u30c6\u30ec\u30fc\u30bf\u304c\u7121\u52b9\u5316\u3055\u308c\u308b\n++it;  \/\/ \u672a\u5b9a\u7fa9\u52d5\u4f5c\n\n\/\/ \u5b89\u5168\u306a\u30d1\u30bf\u30fc\u30f31: erase()\u306e\u623b\u308a\u5024\u3092\u4f7f\u7528\nauto it = dataMap.begin();\nit = dataMap.erase(it);  \/\/ \u6b21\u306e\u6709\u52b9\u306a\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u53d6\u5f97\n\n\/\/ \u5371\u967a\u306a\u30d1\u30bf\u30fc\u30f32: \u8981\u7d20\u8ffd\u52a0\u6642\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u4fdd\u6301\nauto it = dataMap.find(1);\ndataMap[4] = \"four\";  \/\/ \u30a4\u30c6\u30ec\u30fc\u30bf\u306f\u4f9d\u7136\u6709\u52b9\nauto it2 = dataMap.insert({5, \"five\"}).first;  \/\/ \u65e2\u5b58\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u306f\u6709\u52b9\u306a\u307e\u307e\n\n\/\/ \u5b89\u5168\u306a\u30d1\u30bf\u30fc\u30f32: \u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u518d\u53d6\u5f97\nvoid safeIteration(std::map&lt;int, std::string&gt;&amp; dataMap) {\n    for (auto it = dataMap.begin(); it != dataMap.end(); ) {\n        if (shouldDelete(it-&gt;second)) {\n            it = dataMap.erase(it);  \/\/ \u65b0\u3057\u3044\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u53d6\u5f97\n        } else {\n            ++it;\n        }\n    }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a4\u30c6\u30ec\u30fc\u30bf\u95a2\u9023\u306e\u554f\u984c\u3092\u9632\u3050\u305f\u3081\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>erase()\u5f8c\u306f\u5fc5\u305a\u6b21\u306e\u6709\u52b9\u306a\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b<\/li>\n\n\n\n<li>\u8981\u7d20\u8ffd\u52a0\u30fb\u524a\u9664\u5f8c\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u6709\u52b9\u6027\u3092\u5e38\u306b\u610f\u8b58\u3059\u308b<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u518d\u53d6\u5f97\u3059\u308b<\/li>\n\n\n\n<li>\u7bc4\u56f2\u30d9\u30fc\u30b9\u306efor\u30eb\u30fc\u30d7\u3092\u6d3b\u7528\u3059\u308b\uff08\u53ef\u80fd\u306a\u5834\u5408\uff09<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5b89\u5168\u306a\u53cd\u5fa9\u51e6\u7406\u306e\u4f8b\nvoid processMap(std::map&lt;int, std::string&gt;&amp; dataMap) {\n    \/\/ \u7bc4\u56f2\u30d9\u30fc\u30b9\u306efor\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\uff08\u8981\u7d20\u306e\u8ffd\u52a0\u30fb\u524a\u9664\u3092\u884c\u308f\u306a\u3044\u5834\u5408\uff09\n    for (const auto&amp; [key, value] : dataMap) {\n        std::cout &lt;&lt; key &lt;&lt; \": \" &lt;&lt; value &lt;&lt; std::endl;\n    }\n\n    \/\/ \u8981\u7d20\u306e\u524a\u9664\u3092\u4f34\u3046\u5834\u5408\u306e\u5b89\u5168\u306a\u5b9f\u88c5\n    for (auto it = dataMap.begin(); it != dataMap.end(); ) {\n        if (needsToBeDeleted(it-&gt;second)) {\n            it = dataMap.erase(it);\n        } else {\n            ++it;\n        }\n    }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30a8\u30e9\u30fc\u30d1\u30bf\u30fc\u30f3\u3068\u5bfe\u7b56\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u3067\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u4ee5\u4e0b\u306e\u70b9\u306b\u6ce8\u610f\u3092\u6255\u3046\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u81ea\u52d5\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>RAII\u30d1\u30bf\u30fc\u30f3\u306e\u9069\u7528<\/li>\n\n\n\n<li>\u4f8b\u5916\u5b89\u5168\u306a\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u9069\u5207\u306a\u7ba1\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7121\u52b9\u5316\u6761\u4ef6\u306e\u7406\u89e3<\/li>\n\n\n\n<li>\u5b89\u5168\u306a\u524a\u9664\u64cd\u4f5c<\/li>\n\n\n\n<li>\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u518d\u53d6\u5f97\u30bf\u30a4\u30df\u30f3\u30b0<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30d0\u30c3\u30b0\u3068\u30c6\u30b9\u30c8<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u691c\u51fa\u30c4\u30fc\u30eb\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u5883\u754c\u6761\u4ef6\u306e\u30c6\u30b9\u30c8<\/li>\n\n\n\n<li>\u4f8b\u5916\u767a\u751f\u6642\u306e\u52d5\u4f5c\u78ba\u8a8d<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u6ce8\u610f\u70b9\u3092\u5b88\u308b\u3053\u3068\u3067\u3001\u591a\u304f\u306e\u4e00\u822c\u7684\u306a\u554f\u984c\u3092\u672a\u7136\u306b\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-17\">\u5b9f\u52d9\u3067\u4f7f\u3048\u308b\uff01\u30de\u30c3\u30d7\u306e\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30ad\u30e3\u30c3\u30b7\u30e5\u30b7\u30b9\u30c6\u30e0\u306e\u5b9f\u88c5\u4f8b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9ad8\u6027\u80fd\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u30b7\u30b9\u30c6\u30e0\u3092map\u3092\u4f7f\u3063\u3066\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;chrono&gt;\n#include &lt;optional&gt;\n\ntemplate&lt;typename K, typename V&gt;\nclass CacheSystem {\nprivate:\n    struct CacheEntry {\n        V value;\n        std::chrono::system_clock::time_point expiry;\n\n        CacheEntry(const V&amp; v, std::chrono::seconds ttl) \n            : value(v)\n            , expiry(std::chrono::system_clock::now() + ttl) {}\n    };\n\n    std::map&lt;K, CacheEntry&gt; cache;\n    std::chrono::seconds defaultTTL;\n\npublic:\n    CacheSystem(std::chrono::seconds ttl = std::chrono::seconds(3600))\n        : defaultTTL(ttl) {}\n\n    \/\/ \u5024\u306e\u8ffd\u52a0\n    void put(const K&amp; key, const V&amp; value) {\n        cache.insert_or_assign(key, CacheEntry(value, defaultTTL));\n    }\n\n    \/\/ \u5024\u306e\u53d6\u5f97\n    std::optional&lt;V&gt; get(const K&amp; key) {\n        auto now = std::chrono::system_clock::now();\n        auto it = cache.find(key);\n\n        if (it != cache.end()) {\n            if (it-&gt;second.expiry &gt; now) {\n                return it-&gt;second.value;\n            } else {\n                cache.erase(it);  \/\/ \u671f\u9650\u5207\u308c\u30a8\u30f3\u30c8\u30ea\u306e\u524a\u9664\n            }\n        }\n        return std::nullopt;\n    }\n\n    \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\n    void cleanup() {\n        auto now = std::chrono::system_clock::now();\n        for (auto it = cache.begin(); it != cache.end(); ) {\n            if (it-&gt;second.expiry &lt;= now) {\n                it = cache.erase(it);\n            } else {\n                ++it;\n            }\n        }\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nint main() {\n    CacheSystem&lt;std::string, int&gt; cache;\n\n    \/\/ \u30c7\u30fc\u30bf\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\n    cache.put(\"key1\", 100);\n\n    \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u30c7\u30fc\u30bf\u53d6\u5f97\n    if (auto value = cache.get(\"key1\")) {\n        std::cout &lt;&lt; \"Cached value: \" &lt;&lt; *value &lt;&lt; std::endl;\n    }\n\n    return 0;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u30b0\u30e9\u30d5\u69cb\u9020\u306e\u5b9f\u88c5\u306b\u304a\u3051\u308bmap\u6d3b\u7528\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">map\u3092\u4f7f\u7528\u3057\u3066\u52b9\u7387\u7684\u306a\u30b0\u30e9\u30d5\u69cb\u9020\u3092\u5b9f\u88c5\u3059\u308b\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;vector&gt;\n#include &lt;queue&gt;\n#include &lt;limits&gt;\n\nclass Graph {\nprivate:\n    \/\/ \u96a3\u63a5\u30ea\u30b9\u30c8\u3092map\u3067\u5b9f\u88c5\n    std::map&lt;int, std::map&lt;int, int&gt;&gt; adjacencyList;  \/\/ node -&gt; {neighbor -&gt; weight}\n\npublic:\n    \/\/ \u30a8\u30c3\u30b8\u306e\u8ffd\u52a0\n    void addEdge(int from, int to, int weight) {\n        adjacencyList[from][to] = weight;\n    }\n\n    \/\/ \u6700\u77ed\u7d4c\u8def\u8a08\u7b97\uff08\u30c0\u30a4\u30af\u30b9\u30c8\u30e9\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\uff09\n    std::map&lt;int, int&gt; shortestPath(int start) {\n        std::map&lt;int, int&gt; distances;\n        std::map&lt;int, bool&gt; visited;\n\n        \/\/ \u521d\u671f\u5316\n        for (const auto&amp; [node, _] : adjacencyList) {\n            distances[node] = std::numeric_limits&lt;int&gt;::max();\n        }\n        distances[start] = 0;\n\n        \/\/ \u512a\u5148\u5ea6\u4ed8\u304d\u30ad\u30e5\u30fc\n        std::priority_queue&lt;\n            std::pair&lt;int, int&gt;,\n            std::vector&lt;std::pair&lt;int, int&gt;&gt;,\n            std::greater&lt;&gt;\n        &gt; pq;\n        pq.push({0, start});\n\n        while (!pq.empty()) {\n            auto [dist, current] = pq.top();\n            pq.pop();\n\n            if (visited[current]) continue;\n            visited[current] = true;\n\n            \/\/ \u96a3\u63a5\u30ce\u30fc\u30c9\u306e\u51e6\u7406\n            for (const auto&amp; [neighbor, weight] : adjacencyList[current]) {\n                if (!visited[neighbor]) {\n                    int newDist = distances[current] + weight;\n                    if (newDist &lt; distances[neighbor]) {\n                        distances[neighbor] = newDist;\n                        pq.push({newDist, neighbor});\n                    }\n                }\n            }\n        }\n\n        return distances;\n    }\n\n    \/\/ \u30b0\u30e9\u30d5\u306e\u53ef\u8996\u5316\n    void printGraph() const {\n        for (const auto&amp; [node, edges] : adjacencyList) {\n            std::cout &lt;&lt; \"Node \" &lt;&lt; node &lt;&lt; \" connects to: \";\n            for (const auto&amp; [neighbor, weight] : edges) {\n                std::cout &lt;&lt; \"(\" &lt;&lt; neighbor &lt;&lt; \", \" &lt;&lt; weight &lt;&lt; \") \";\n            }\n            std::cout &lt;&lt; std::endl;\n        }\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nint main() {\n    Graph g;\n\n    \/\/ \u30a8\u30c3\u30b8\u306e\u8ffd\u52a0\n    g.addEdge(0, 1, 4);\n    g.addEdge(0, 2, 1);\n    g.addEdge(1, 3, 1);\n    g.addEdge(2, 1, 2);\n    g.addEdge(2, 3, 5);\n\n    \/\/ \u30b0\u30e9\u30d5\u306e\u8868\u793a\n    g.printGraph();\n\n    \/\/ \u6700\u77ed\u7d4c\u8def\u306e\u8a08\u7b97\n    auto distances = g.shortestPath(0);\n    for (const auto&amp; [node, dist] : distances) {\n        std::cout &lt;&lt; \"Distance to node \" &lt;&lt; node &lt;&lt; \": \" &lt;&lt; dist &lt;&lt; std::endl;\n    }\n\n    return 0;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5b9f\u52d9\u4e0a\u306e\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b7\u30b9\u30c6\u30e0<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u306e\u52b9\u7387\u5316<\/li>\n\n\n\n<li>\u30a2\u30af\u30bb\u30b9\u901f\u5ea6\u306e\u5411\u4e0a<\/li>\n\n\n\n<li>\u6709\u52b9\u671f\u9650\u7ba1\u7406\u306e\u81ea\u52d5\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b0\u30e9\u30d5\u69cb\u9020<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u758e\u306a\u30b0\u30e9\u30d5\u306e\u52b9\u7387\u7684\u306a\u8868\u73fe<\/li>\n\n\n\n<li>\u52d5\u7684\u306a\u30b0\u30e9\u30d5\u64cd\u4f5c<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u306e\u6700\u9069\u5316<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u5b9f\u88c5\u306f\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u76f4\u63a5\u5229\u7528\u3067\u304d\u308b\u5b9f\u8df5\u7684\u306a\u3082\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-20\">C++ \u30de\u30c3\u30d7\u306e\u4ee3\u66ff\u624b\u6bb5\u3068\u6d3b\u7528<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">unordered_map\u3068\u306e\u6bd4\u8f03\u3068\u6b63\u3057\u3044\u9078\u629e\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>std::map<\/code>\u3068<code>std::unordered_map<\/code>\u306e\u4e3b\u8981\u306a\u9055\u3044\u3068\u9078\u629e\u57fa\u6e96\u3092\u89e3\u8aac\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;unordered_map&gt;\n#include &lt;string&gt;\n#include &lt;chrono&gt;\n\n\/\/ \u4e21\u8005\u306e\u7279\u6027\u3092\u6bd4\u8f03\u3059\u308b\u30d9\u30f3\u30c1\u30de\u30fc\u30af\nclass MapComparison {\npublic:\n    static void compareOperations() {\n        std::map&lt;int, std::string&gt; ordered;\n        std::unordered_map&lt;int, std::string&gt; unordered;\n\n        \/\/ \u633f\u5165\u6027\u80fd\u306e\u6bd4\u8f03\n        auto start = std::chrono::high_resolution_clock::now();\n        for (int i = 0; i &lt; 100000; ++i) {\n            ordered[i] = \"value\" + std::to_string(i);\n        }\n        auto orderedInsertTime = std::chrono::duration_cast&lt;std::chrono::milliseconds&gt;(\n            std::chrono::high_resolution_clock::now() - start\n        ).count();\n\n        start = std::chrono::high_resolution_clock::now();\n        for (int i = 0; i &lt; 100000; ++i) {\n            unordered[i] = \"value\" + std::to_string(i);\n        }\n        auto unorderedInsertTime = std::chrono::duration_cast&lt;std::chrono::milliseconds&gt;(\n            std::chrono::high_resolution_clock::now() - start\n        ).count();\n\n        std::cout &lt;&lt; \"Insert time comparison:\\n\"\n                  &lt;&lt; \"std::map: \" &lt;&lt; orderedInsertTime &lt;&lt; \"ms\\n\"\n                  &lt;&lt; \"std::unordered_map: \" &lt;&lt; unorderedInsertTime &lt;&lt; \"ms\\n\";\n    }\n};<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9078\u629e\u57fa\u6e96\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>std::map<\/code>\u3092\u9078\u3076\u5834\u5408\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ad\u30fc\u306e\u9806\u5e8f\u304c\u91cd\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u5b89\u5b9a\u6027\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u52b9\u7387\u3092\u91cd\u8996\u3059\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u7bc4\u56f2\u691c\u7d22\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>std::unordered_map<\/code>\u3092\u9078\u3076\u5834\u5408\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ad\u30fc\u306e\u9806\u5e8f\u304c\u4e0d\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u691c\u7d22\u30fb\u633f\u5165\u306e\u5e73\u5747\u7684\u306a\u6027\u80fd\u3092\u91cd\u8996\u3059\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3088\u308a\u3082\u901f\u5ea6\u3092\u512a\u5148\u3059\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u5358\u4e00\u8981\u7d20\u306e\u30a2\u30af\u30bb\u30b9\u304c\u4e3b\u306a\u7528\u9014\u306e\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">\u4ed6\u306eSTL\u30b3\u30f3\u30c6\u30ca\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u6d3b\u7528\u8853<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">map\u3068\u4ed6\u306eSTL\u30b3\u30f3\u30c6\u30ca\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u9ad8\u5ea6\u306a\u4f7f\u7528\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;map&gt;\n#include &lt;vector&gt;\n#include &lt;set&gt;\n#include &lt;queue&gt;\n\n\/\/ \u8907\u5408\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u4f8b\uff1a\u512a\u5148\u5ea6\u4ed8\u304d\u30bf\u30b9\u30af\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\nclass TaskManager {\nprivate:\n    \/\/ \u30bf\u30b9\u30af\u306e\u512a\u5148\u5ea6\u7ba1\u7406\n    std::map&lt;int, std::set&lt;std::string&gt;&gt; priorityTasks;\n    \/\/ \u30bf\u30b9\u30af\u306e\u8a73\u7d30\u60c5\u5831\n    std::unordered_map&lt;std::string, TaskDetails&gt; taskDetails;\n    \/\/ \u5b8c\u4e86\u30bf\u30b9\u30af\u306e\u5c65\u6b74\n    std::vector&lt;std::string&gt; completedTasks;\n\npublic:\n    struct TaskDetails {\n        std::string description;\n        std::chrono::system_clock::time_point deadline;\n        bool isCompleted;\n    };\n\n    \/\/ \u30bf\u30b9\u30af\u306e\u8ffd\u52a0\n    void addTask(const std::string&amp; taskId, \n                const std::string&amp; description,\n                int priority,\n                std::chrono::system_clock::time_point deadline) {\n        priorityTasks[priority].insert(taskId);\n        taskDetails[taskId] = {description, deadline, false};\n    }\n\n    \/\/ \u6700\u9ad8\u512a\u5148\u5ea6\u306e\u30bf\u30b9\u30af\u3092\u53d6\u5f97\n    std::optional&lt;std::string&gt; getHighestPriorityTask() {\n        if (priorityTasks.empty()) return std::nullopt;\n\n        auto&amp; highestPrioritySet = priorityTasks.rbegin()-&gt;second;\n        if (highestPrioritySet.empty()) return std::nullopt;\n\n        return *highestPrioritySet.begin();\n    }\n\n    \/\/ \u30bf\u30b9\u30af\u306e\u5b8c\u4e86\u51e6\u7406\n    void completeTask(const std::string&amp; taskId) {\n        auto detailsIt = taskDetails.find(taskId);\n        if (detailsIt == taskDetails.end()) return;\n\n        detailsIt-&gt;second.isCompleted = true;\n        completedTasks.push_back(taskId);\n\n        \/\/ \u512a\u5148\u5ea6\u30ea\u30b9\u30c8\u304b\u3089\u524a\u9664\n        for (auto&amp; [priority, tasks] : priorityTasks) {\n            tasks.erase(taskId);\n            if (tasks.empty()) {\n                priorityTasks.erase(priority);\n            }\n        }\n    }\n\n    \/\/ \u671f\u9650\u5207\u308c\u30bf\u30b9\u30af\u306e\u53d6\u5f97\n    std::vector&lt;std::string&gt; getOverdueTasks() {\n        std::vector&lt;std::string&gt; overdueTasks;\n        auto now = std::chrono::system_clock::now();\n\n        for (const auto&amp; [taskId, details] : taskDetails) {\n            if (!details.isCompleted &amp;&amp; details.deadline &lt; now) {\n                overdueTasks.push_back(taskId);\n            }\n        }\n\n        return overdueTasks;\n    }\n};<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">STL\u30b3\u30f3\u30c6\u30ca\u306e\u7d44\u307f\u5408\u308f\u305b\u30c6\u30af\u30cb\u30c3\u30af\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30de\u30c3\u30d7\u3068\u30d9\u30af\u30bf\u30fc\u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u30ad\u30fc\u3067\u30bd\u30fc\u30c8\u3055\u308c\u305f\u5024\u306e\u30ea\u30b9\u30c8\u3092\u7ba1\u7406\n   std::map&lt;std::string, std::vector&lt;int&gt;&gt; sortedLists;\n\n   \/\/ \u5024\u306e\u8ffd\u52a0\n   void addValue(const std::string&amp; key, int value) {\n       auto&amp; vec = sortedLists[key];\n       vec.push_back(value);\n       std::sort(vec.begin(), vec.end());\n   }<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u30de\u30c3\u30d7\u3068\u30ad\u30e5\u30fc\u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u30b7\u30b9\u30c6\u30e0\u306e\u5b9f\u88c5\u4f8b\n   std::map&lt;std::string, std::queue&lt;Event&gt;&gt; eventQueues;\n\n   void pushEvent(const std::string&amp; channel, const Event&amp; event) {\n       eventQueues[channel].push(event);\n   }\n\n   std::optional&lt;Event&gt; popEvent(const std::string&amp; channel) {\n       auto it = eventQueues.find(channel);\n       if (it == eventQueues.end() || it-&gt;second.empty()) {\n           return std::nullopt;\n       }\n\n       Event event = it-&gt;second.front();\n       it-&gt;second.pop();\n       return event;\n   }<\/pre>\n\n\n\n<p 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