{"id":86,"date":"2023-11-05T22:56:00","date_gmt":"2023-11-05T14:56:00","guid":{"rendered":"http:\/\/www.cmd137blog.top\/?p=86"},"modified":"2024-03-31T23:00:33","modified_gmt":"2024-03-31T15:00:33","slug":"%e3%80%90%e6%b4%9b%e8%b0%b7%e3%80%91p1044-noip2003-%e6%99%ae%e5%8f%8a%e7%bb%84-%e6%a0%88%ef%bc%88%e5%b7%a7%e5%a6%99%e9%80%92%e6%8e%a8%ef%bc%89","status":"publish","type":"post","link":"http:\/\/www.cmd137blog.top\/?p=86","title":{"rendered":"\u3010\u6d1b\u8c37\u3011P1044 [NOIP2003 \u666e\u53ca\u7ec4] \u6808\uff08\u5de7\u5999\u9012\u63a8\uff09"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\u4e00\u3001\u9898\u76ee\uff1a<\/h1>\n\n\n\n<h1 class=\"wp-block-heading\">[NOIP2003 \u666e\u53ca\u7ec4] \u6808<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">\u9898\u76ee\u80cc\u666f<\/h2>\n\n\n\n<p>\u6808\u662f\u8ba1\u7b97\u673a\u4e2d\u7ecf\u5178\u7684\u6570\u636e\u7ed3\u6784\uff0c\u7b80\u5355\u7684\u8bf4\uff0c\u6808\u5c31\u662f\u9650\u5236\u5728\u4e00\u7aef\u8fdb\u884c\u63d2\u5165\u5220\u9664\u64cd\u4f5c\u7684\u7ebf\u6027\u8868\u3002<\/p>\n\n\n\n<p>\u6808\u6709\u4e24\u79cd\u6700\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u5373 pop\uff08\u4ece\u6808\u9876\u5f39\u51fa\u4e00\u4e2a\u5143\u7d20\uff09\u548c push\uff08\u5c06\u4e00\u4e2a\u5143\u7d20\u8fdb\u6808\uff09\u3002<\/p>\n\n\n\n<p>\u6808\u7684\u91cd\u8981\u6027\u4e0d\u8a00\u81ea\u660e\uff0c\u4efb\u4f55\u4e00\u95e8\u6570\u636e\u7ed3\u6784\u7684\u8bfe\u7a0b\u90fd\u4f1a\u4ecb\u7ecd\u6808\u3002\u5b81\u5b81\u540c\u5b66\u5728\u590d\u4e60\u6808\u7684\u57fa\u672c\u6982\u5ff5\u65f6\uff0c\u60f3\u5230\u4e86\u4e00\u4e2a\u4e66\u4e0a\u6ca1\u6709\u8bb2\u8fc7\u7684\u95ee\u9898\uff0c\u800c\u4ed6\u81ea\u5df1\u65e0\u6cd5\u7ed9\u51fa\u7b54\u6848\uff0c\u6240\u4ee5\u9700\u8981\u4f60\u7684\u5e2e\u5fd9\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u9898\u76ee\u63cf\u8ff0<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/03\/e57d77947a25af341835b44ccb989d87.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"869\" height=\"426\" data-original=\"http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/03\/e57d77947a25af341835b44ccb989d87.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-85\"  sizes=\"auto, (max-width: 869px) 100vw, 869px\" \/><\/div><\/figure>\n\n\n\n<p>\u5b81\u5b81\u8003\u8651\u7684\u662f\u8fd9\u6837\u4e00\u4e2a\u95ee\u9898\uff1a\u4e00\u4e2a\u64cd\u4f5c\u6570\u5e8f\u5217\uff0c$1,2,\\ldots ,n$\uff08\u56fe\u793a\u4e3a 1 \u5230 3 \u7684\u60c5\u51b5\uff09\uff0c\u6808 A \u7684\u6df1\u5ea6\u5927\u4e8e $n$\u3002<\/p>\n\n\n\n<p>\u73b0\u5728\u53ef\u4ee5\u8fdb\u884c\u4e24\u79cd\u64cd\u4f5c\uff0c<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5c06\u4e00\u4e2a\u6570\uff0c\u4ece\u64cd\u4f5c\u6570\u5e8f\u5217\u7684\u5934\u7aef\u79fb\u5230\u6808\u7684\u5934\u7aef\uff08\u5bf9\u5e94\u6570\u636e\u7ed3\u6784\u6808\u7684 push \u64cd\u4f5c\uff09<\/li>\n\n\n\n<li>\u5c06\u4e00\u4e2a\u6570\uff0c\u4ece\u6808\u7684\u5934\u7aef\u79fb\u5230\u8f93\u51fa\u5e8f\u5217\u7684\u5c3e\u7aef\uff08\u5bf9\u5e94\u6570\u636e\u7ed3\u6784\u6808\u7684 pop \u64cd\u4f5c\uff09<\/li>\n<\/ol>\n\n\n\n<p>\u4f7f\u7528\u8fd9\u4e24\u79cd\u64cd\u4f5c\uff0c\u7531\u4e00\u4e2a\u64cd\u4f5c\u6570\u5e8f\u5217\u5c31\u53ef\u4ee5\u5f97\u5230\u4e00\u7cfb\u5217\u7684\u8f93\u51fa\u5e8f\u5217\uff0c\u4e0b\u56fe\u6240\u793a\u4e3a\u7531 <code>1 2 3<\/code> \u751f\u6210\u5e8f\u5217 <code>2 3 1<\/code> \u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/03\/35db972a17716a558dd11f938d5dc0db.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"869\" height=\"692\" data-original=\"http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/03\/35db972a17716a558dd11f938d5dc0db.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-87\"  sizes=\"auto, (max-width: 869px) 100vw, 869px\" \/><\/div><\/figure>\n\n\n\n<p>\uff08\u539f\u59cb\u72b6\u6001\u5982\u4e0a\u56fe\u6240\u793a\uff09<\/p>\n\n\n\n<p>\u4f60\u7684\u7a0b\u5e8f\u5c06\u5bf9\u7ed9\u5b9a\u7684 $n$\uff0c\u8ba1\u7b97\u5e76\u8f93\u51fa\u7531\u64cd\u4f5c\u6570\u5e8f\u5217 $1,2,\\ldots,n$ \u7ecf\u8fc7\u64cd\u4f5c\u53ef\u80fd\u5f97\u5230\u7684\u8f93\u51fa\u5e8f\u5217\u7684\u603b\u6570\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u8f93\u5165\u683c\u5f0f<\/h2>\n\n\n\n<p>\u8f93\u5165\u6587\u4ef6\u53ea\u542b\u4e00\u4e2a\u6574\u6570 $n$\uff08$1 \\leq n \\leq 18$\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u8f93\u51fa\u683c\u5f0f<\/h2>\n\n\n\n<p>\u8f93\u51fa\u6587\u4ef6\u53ea\u6709\u4e00\u884c\uff0c\u5373\u53ef\u80fd\u8f93\u51fa\u5e8f\u5217\u7684\u603b\u6570\u76ee\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6837\u4f8b #1<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u6837\u4f8b\u8f93\u5165 #1<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>3<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u6837\u4f8b\u8f93\u51fa #1<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>5<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u63d0\u793a<\/h2>\n\n\n\n<p><strong>\u3010\u9898\u76ee\u6765\u6e90\u3011<\/strong><\/p>\n\n\n\n<p>NOIP 2003 \u666e\u53ca\u7ec4\u7b2c\u4e09\u9898<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u4e8c\u3001\u601d\u8def\uff1a<\/h1>\n\n\n\n<p>\u6838\u5fc3\uff1a<br><img decoding=\"async\" src=\"https:\/\/img-blog.csdnimg.cn\/3de56a3336ec464cadba2a8a5f8f8d95.jpeg\" alt=\"\"><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/03\/3de56a3336ec464cadba2a8a5f8f8d95-1024x462.jpeg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"462\" data-original=\"http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/03\/3de56a3336ec464cadba2a8a5f8f8d95-1024x462.jpeg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-88\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u5efa\u7acb\u6570\u7ec4f[n]\uff0c\u6613\u5f97f[0]=1,f[1]=1\uff0c\uff08\u7531\u4e8ek\u6700\u5c0f\u4e3a1\uff0cf\uff082\uff09=f(1-1)<em>f(2-1)+f(2-1)<\/em>f(1-1)\uff0c\u6211\u4eec\u81f3\u5c11\u4e3e\u51faf\uff081\uff09\u3001f\uff080\uff09),\u901a\u8fc7\u5faa\u73af\u4f9d\u6b21\u9012\u63a8\u51faf\uff08n\uff09\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#2e3440ff\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" data-code=\"    int f[20] = {0};\n    f[0] = 1;\n    f[1] = 1;\n    for (int i = 2; i <= n; i++) {\n        for (int j = 1; j <= i; j++) {\n            f[i] += f[j - 1] * f[i - j];\n        }\n    }\" style=\"color:#d8dee9ff;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki nord\" style=\"background-color: #2e3440ff\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">int<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #B48EAD\">20<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><span style=\"color: #B48EAD\">0<\/span><span style=\"color: #ECEFF4\">}<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #B48EAD\">0<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">for<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">(<\/span><span style=\"color: #81A1C1\">int<\/span><span style=\"color: #D8DEE9FF\"> i <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">2<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #D8DEE9FF\"> i <\/span><span style=\"color: #81A1C1\">&lt;=<\/span><span style=\"color: #D8DEE9FF\"> n<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #D8DEE9FF\"> i<\/span><span style=\"color: #81A1C1\">++<\/span><span style=\"color: #ECEFF4\">)<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #81A1C1\">for<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">(<\/span><span style=\"color: #81A1C1\">int<\/span><span style=\"color: #D8DEE9FF\"> j <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #D8DEE9FF\"> j <\/span><span style=\"color: #81A1C1\">&lt;=<\/span><span style=\"color: #D8DEE9FF\"> i<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #D8DEE9FF\"> j<\/span><span style=\"color: #81A1C1\">++<\/span><span style=\"color: #ECEFF4\">)<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">            <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #D8DEE9FF\">i<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">+=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #D8DEE9FF\">j <\/span><span style=\"color: #81A1C1\">-<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">*<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #D8DEE9FF\">i <\/span><span style=\"color: #81A1C1\">-<\/span><span style=\"color: #D8DEE9FF\"> j<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #ECEFF4\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #ECEFF4\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<h1 class=\"wp-block-heading\">\u4e09\u3001\u6e90\u7801\uff1a<\/h1>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#2e3440ff\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" data-code=\"#include <iostream&gt;\nusing namespace std;\n\nint main() {\n    int n;\n    cin &gt;&gt; n;\n\n    int f[20] = {0};\n    f[0] = 1;\n    f[1] = 1;\n    for (int i = 2; i <= n; i++) {\n        for (int j = 1; j <= i; j++) {\n            f[i] += f[j - 1] * f[i - j];\n        }\n    }\n    cout << f[n];\n\n    return 0;\n}\" style=\"color:#d8dee9ff;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki nord\" style=\"background-color: #2e3440ff\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #5E81AC; font-weight: bold\">#<\/span><span style=\"color: #81A1C1\">include<\/span><span style=\"color: #5E81AC\"> <\/span><span style=\"color: #ECEFF4\">&lt;<\/span><span style=\"color: #A3BE8C\">iostream<\/span><span style=\"color: #ECEFF4\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">using<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">namespace<\/span><span style=\"color: #D8DEE9FF\"> std<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">int<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #88C0D0\">main<\/span><span style=\"color: #ECEFF4\">()<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">int<\/span><span style=\"color: #D8DEE9FF\"> n<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    cin <\/span><span style=\"color: #81A1C1\">&gt;&gt;<\/span><span style=\"color: #D8DEE9FF\"> n<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">int<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #B48EAD\">20<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><span style=\"color: #B48EAD\">0<\/span><span style=\"color: #ECEFF4\">}<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #B48EAD\">0<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">for<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">(<\/span><span style=\"color: #81A1C1\">int<\/span><span style=\"color: #D8DEE9FF\"> i <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">2<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #D8DEE9FF\"> i <\/span><span style=\"color: #81A1C1\">&lt;=<\/span><span style=\"color: #D8DEE9FF\"> n<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #D8DEE9FF\"> i<\/span><span style=\"color: #81A1C1\">++<\/span><span style=\"color: #ECEFF4\">)<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #81A1C1\">for<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">(<\/span><span style=\"color: #81A1C1\">int<\/span><span style=\"color: #D8DEE9FF\"> j <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #D8DEE9FF\"> j <\/span><span style=\"color: #81A1C1\">&lt;=<\/span><span style=\"color: #D8DEE9FF\"> i<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #D8DEE9FF\"> j<\/span><span style=\"color: #81A1C1\">++<\/span><span style=\"color: #ECEFF4\">)<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">            <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #D8DEE9FF\">i<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">+=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #D8DEE9FF\">j <\/span><span style=\"color: #81A1C1\">-<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">1<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">*<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #D8DEE9FF\">i <\/span><span style=\"color: #81A1C1\">-<\/span><span style=\"color: #D8DEE9FF\"> j<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #ECEFF4\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #ECEFF4\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    cout <\/span><span style=\"color: #81A1C1\">&lt;&lt;<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">f<\/span><span style=\"color: #ECEFF4\">[<\/span><span style=\"color: #D8DEE9FF\">n<\/span><span style=\"color: #ECEFF4\">]<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">return<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #B48EAD\">0<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #ECEFF4\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>\u6b22\u8fce\u6539\u6b63\u4e0e\u8865\u5145<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u9898\u76ee\uff1a [NOIP2003 \u666e\u53ca\u7ec4] \u6808 \u9898\u76ee\u80cc\u666f \u6808\u662f\u8ba1\u7b97\u673a\u4e2d\u7ecf\u5178\u7684\u6570\u636e\u7ed3\u6784\uff0c\u7b80\u5355\u7684\u8bf4\uff0c\u6808\u5c31\u662f\u9650\u5236\u5728\u4e00\u7aef [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[13,9,12],"class_list":["post-86","post","type-post","status-publish","format-standard","hentry","category-3","tag-13","tag-9","tag-12"],"_links":{"self":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/86","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=86"}],"version-history":[{"count":1,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/86\/revisions"}],"predecessor-version":[{"id":89,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/86\/revisions\/89"}],"wp:attachment":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=86"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=86"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=86"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}