{"id":153,"date":"2026-04-01T16:19:40","date_gmt":"2026-04-01T08:19:40","guid":{"rendered":"http:\/\/47.103.53.79\/?p=153"},"modified":"2026-04-10T23:35:39","modified_gmt":"2026-04-10T15:35:39","slug":"acwing-3643-%e4%b8%8a%e6%a5%bc%e6%a2%af","status":"publish","type":"post","link":"http:\/\/47.103.53.79\/index.php\/2026\/04\/01\/acwing-3643-%e4%b8%8a%e6%a5%bc%e6%a2%af\/","title":{"rendered":"AcWing 3643. \u4e0a\u697c\u68af"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u697c\u68af\u5171\u6709&nbsp;n&nbsp;\u7ea7\u53f0\u9636\uff0c\u6bcf\u6b21\u53ef\u4ee5\u8d70\u4e00\u7ea7\u6216\u8005\u4e24\u7ea7\u6216\u8005\u4e09\u7ea7\uff0c\u95ee\u4ece\u7b2c&nbsp;0&nbsp;\u7ea7\u53f0\u9636\u8d70\u5230\u7b2c&nbsp;n&nbsp;\u7ea7\u53f0\u9636\u4e00\u5171\u6709\u591a\u5c11\u79cd\u65b9\u6848\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u8f93\u5165\u683c\u5f0f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u6574\u6570&nbsp;N\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u8f93\u51fa\u683c\u5f0f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u6574\u6570\uff0c\u8868\u793a\u65b9\u6848\u603b\u6570\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u6570\u636e\u8303\u56f4<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">1\u2264N\u226420<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u8f93\u5165\u6837\u4f8b\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>4\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u8f93\u51fa\u6837\u4f8b\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>7<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;bits\/stdc++.h&gt;\nusing namespace std;\nconst int N=1e9+7;\nint dfs(int a)\n\/\/\u4e0d\u8fc7\u662f\u591a\u4e86\u4e00\u4e2a\u9009\u62e9 \u505a\u6cd5\u8fd8\u662f\u4e00\u6837\u7684 \u9012\u5f52 \n{\n\tif(a==1) return 1;\n\tif(a==2) return 2;\n\tif(a==3) return 4;\n\treturn dfs(a-3)+dfs(a-2)+dfs(a-1);\n}\n#define int long long\nsigned main()\n{\n\tint n;\n\tcin&gt;&gt;n;\n\tcout&lt;&lt;dfs(n)&lt;&lt;endl;\n\treturn 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u4e2a\u697c\u68af\u5171\u6709&nbsp;n&nbsp;\u7ea7\u53f0\u9636\uff0c\u6bcf\u6b21\u53ef\u4ee5\u8d70\u4e00\u7ea7\u6216\u8005\u4e24\u7ea7\u6216\u8005\u4e09\u7ea7\uff0c\u95ee\u4ece\u7b2c&nbsp;0&nbsp; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[15,13,24],"class_list":["post-153","post","type-post","status-publish","format-standard","hentry","category-8","tag-15","tag-13","tag-24"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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