{"id":54293,"date":"2025-08-13T01:10:02","date_gmt":"2025-08-12T17:10:02","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54293.html"},"modified":"2025-08-13T01:10:02","modified_gmt":"2025-08-12T17:10:02","slug":"root-was-built-by-love-broken-by-destiny-%e6%a0%b9%e5%9b%a0%e7%88%b1%e8%80%8c%e7%94%9f%ef%bc%8c%e5%9b%a0%e5%91%bd%e8%bf%90%e8%80%8c%e6%96%ad","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54293.html","title":{"rendered":"Root was Built by Love, Broken by Destiny-\u6839\u56e0\u7231\u800c\u751f\uff0c\u56e0\u547d\u8fd0\u800c\u65ad"},"content":{"rendered":"<p>D.\u6839\u56e0\u7231\u800c\u751f&#xff0c;\u56e0\u547d\u8fd0\u800c\u65ad<\/p>\n<p>\u6bcf\u6b21\u6d4b\u8bd5\u65f6\u9650&#xff1a;2 \u79d2<\/p>\n<p>\u6bcf\u6b21\u6d4b\u8bd5\u7684\u5185\u5b58\u9650\u5236&#xff1a;256 \u5146\u5b57\u8282<\/p>\n<p>\u8f93\u5165&#xff1a;\u6807\u51c6\u8f93\u5165<\/p>\n<p>\u8f93\u51fa&#xff1a;\u6807\u51c6\u8f93\u51fa<\/p>\n<\/p>\n<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"%E5%89%8D%E8%A8%80-toc\" style=\"margin-left:0px\">\u524d\u8a00<\/p>\n<p id=\"%E9%A2%98%E7%9B%AE-toc\" style=\"margin-left:0px\">\u9898\u76ee<\/p>\n<p id=\"%E4%BA%8C%E3%80%81%E6%80%9D%E8%B7%AF-toc\" style=\"margin-left:0px\">\u4e8c\u3001\u601d\u8def<\/p>\n<p id=\"%E6%A0%87%E7%A8%8B%EF%BC%88%E5%AE%98%E6%96%B9%E4%BB%A3%E7%A0%81%EF%BC%89-toc\" style=\"margin-left:40px\">\u6807\u7a0b&#xff08;\u5b98\u65b9\u4ee3\u7801&#xff09;<\/p>\n<p id=\"%E6%80%BB%E7%BB%93-toc\" style=\"margin-left:0px\">\u603b\u7ed3<\/p>\n<hr \/>\n<h2 id=\"%E5%89%8D%E8%A8%80\">\u524d\u8a00<\/h2>\n<p>\u6211\u8ba4\u4e3a\u7684\u4e00\u9053\u5f88\u597d\u5f88\u6709\u4ef7\u503c\u7684\u9898<\/p>\n<p>\u6765\u4e86&#xff0c;\u7231\u4e86&#xff0c;\u7ed9\u4e86\u5979\u4e00\u9897\u661f\u661f&#xff0c;\u8d70\u4e86\u3002<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u2014\u2014\u5218\u6148\u6b23\u300a\u4e09\u4f53\u300b<\/p>\n<hr \/>\n<h2 id=\"%E9%A2%98%E7%9B%AE\">\u9898\u76ee<\/h2>\n<p>\u5fc3\u7011\u6cb3\u6a2a\u8d2f\u5fb7\u65af\u5766\u4e50\u56ed&#xff0c;\u5c06\u5176\u5206\u4e3a\u5357\u5317\u4e24\u4fa7\u3002<\/p>\n<p>\u6839\u5de5\u7a0b\u5e08\u60f3\u8981\u5728\u6cb3\u8fb9\u5efa\u9020\u00a0n\u00a0\u5ea7\u623f\u5b50&#xff0c;\u7f16\u53f7\u4ece\u00a01\u00a0\u5230\u00a0n\u00a0\u3002\u5317\u8fb9\u7684\u6240\u6709\u623f\u5c4b\u548c\u5357\u8fb9\u7684\u6240\u6709\u623f\u5c4b\u90fd\u5fc5\u987b\u6cbf\u7740\u4e0e\u5fc3\u7011\u6cb3\u5e73\u884c\u7684\u76f4\u7ebf\u5efa\u9020\u3002<\/p>\n<p>\u5c06\u6709\u00a0m\u00a0\u5ea7\u6865\u6881&#xff0c;\u5176\u4e2d\u00a0i\u00a0(th)\u5ea7\u6865\u6881\u8fde\u63a5\u7740\u00a0ui\u00a0\u53f7\u623f\u5c4b\u548c\u00a0vi\u00a0\u53f7\u623f\u5c4b(\u00a0ui\u2260vi\u00a0)\u3002\u53ef\u4ee5\u4fdd\u8bc1\u6240\u6709\u00a0n\u00a0\u4e2a\u623f\u5b50\u90fd\u88ab\u8fd9\u4e9b\u6865\u8fde\u63a5\u8d77\u6765&#xff0c;\u4e5f\u5c31\u662f\u8bf4&#xff0c;\u4f60\u53ef\u4ee5\u901a\u8fc7\u8fc7\u6865\u4ece\u4efb\u4f55\u4e00\u4e2a\u623f\u5b50\u5230\u8fbe\u53e6\u4e00\u4e2a\u623f\u5b50\u3002\u800c\u4e14&#xff0c;\u6ca1\u6709\u4e24\u5ea7\u6865\u8fde\u63a5\u540c\u4e00\u5bf9\u623f\u5b50\u3002<\/p>\n<p>\u6839\u60f3\u77e5\u9053\u6709\u591a\u5c11\u79cd\u6cbf\u6cb3\u6392\u5217\u00a0n\u00a0\u5ea7\u623f\u5b50\u7684\u65b9\u6cd5&#xff0c;\u6a21\u6570\u4e3a\u00a0109&#043;7\u00a0&#xff0c;\u4f7f\u5f97\u4ee5\u4e0b\u6761\u4ef6\u5bf9\u89c4\u5212\u7684\u00a0m\u00a0\u5ea7\u6865\u6881\u6210\u7acb&#xff1a;<\/p>\n<ul>\n<li>\u5bf9\u4e8e\u6bcf\u4e00\u5ea7\u6865&#xff0c;\u5b83\u6240\u8fde\u63a5\u7684\u4e24\u5ea7\u623f\u5b50\u90fd\u4f4d\u4e8e\u6cb3\u7684\u4e24\u5cb8&#xff1b;<\/li>\n<li>\u5728\u623f\u5c4b\u4e4b\u95f4\u753b\u76f4\u7ebf\u65f6&#xff0c;\u6865\u6881\u4e0d\u4f1a\u4ea4\u53c9\u3002<\/li>\n<\/ul>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"592\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812170958-689b7566eca08.png\" width=\"878\" \/><\/p>\n<p>\u00a0\u5f53\u00a0n&#061;5\u00a0\u65f6\u53ef\u80fd\u7684\u623f\u5c4b\u6392\u5217\u3002<\/p>\n<p>\u5982\u679c\u4ee5\u4e0b\u6761\u4ef6\u4e2d\u81f3\u5c11\u6709\u4e00\u4e2a\u6210\u7acb&#xff0c;\u90a3\u4e48\u8fd9\u4e24\u79cd\u6392\u5217\u5c31\u88ab\u8ba4\u4e3a\u662f\u4e0d\u540c\u7684&#xff1a;<\/p>\n<ul>\n<li>\u5728\u6bcf\u79cd\u6392\u5217\u4e2d&#xff0c;\u90fd\u5b58\u5728\u4f4d\u4e8e\u4e0d\u540c\u8fb9\u4e0a\u7684\u623f\u5b50&#xff1b;<\/li>\n<li>\u5b58\u5728\u4e24\u5ea7\u623f\u5b50\u00a0a\u00a0\u548c\u00a0b\u00a0&#xff0c;\u8fd9\u4e24\u5ea7\u623f\u5b50\u5728\u4e24\u4e2a\u6392\u5217\u4e2d\u90fd\u4f4d\u4e8e\u540c\u4e00\u8fb9&#xff0c;\u4f46\u662f\u5728\u4e00\u4e2a\u6392\u5217\u4e2d\u00a0a\u00a0\u4f4d\u4e8e\u00a0b\u00a0\u4e4b\u524d&#xff0c;\u800c\u5728\u53e6\u4e00\u4e2a\u6392\u5217\u4e2d\u00a0b\u00a0\u4f4d\u4e8e\u00a0a\u00a0\u4e4b\u524d\u3002<\/li>\n<\/ul>\n<p>\u7531\u4e8e\u6839\u88ab\u4ed6\u7684\u524d\u5973\u53cb\u6240\u56f0\u6270&#xff0c;\u547d\u8fd0\u5c06\u4ed6\u4e0e\u524d\u5973\u53cb\u5206\u5f00&#xff0c;\u56e0\u6b64\u4ed6\u8981\u6c42\u4f60\u8ba1\u7b97\u6cbf\u6cb3\u6392\u5217\u623f\u5c4b\u7684\u65b9\u5f0f\u6570&#xff0c;\u6a21\u6570\u4e3a\u00a01e9&#043;7\u00a0\u3002<\/p>\n<p>\u8f93\u5165<\/p>\n<p>\u6bcf\u4e2a\u6d4b\u8bd5\u5305\u542b\u591a\u4e2a\u6d4b\u8bd5\u7528\u4f8b\u3002\u7b2c\u4e00\u884c\u5305\u542b\u6d4b\u8bd5\u7528\u4f8b\u7684\u6570\u91cf\u00a0t\u00a0(\u00a01\u2264t\u2264104\u00a0)\u3002\u6d4b\u8bd5\u7528\u4f8b\u8bf4\u660e\u5982\u4e0b\u3002<\/p>\n<p>\u6bcf\u4e2a\u6d4b\u8bd5\u7528\u4f8b\u7684\u7b2c\u4e00\u884c\u5305\u542b\u4e24\u4e2a\u6574\u6570\u00a0n\u00a0\u548c\u00a0m\u00a0(\u00a02\u2264n\u22642\u22c5105\u00a0,\u00a0n\u22121\u2264m\u2264min(n(n\u22121)2,2\u22c5105)\u00a0)&#8211;\u623f\u5c4b\u6570\u91cf\u548c\u6865\u6881\u6570\u91cf\u3002<\/p>\n<p>\u63a5\u7740\u662f\u00a0m\u00a0\u884c&#xff0c;\u5176\u4e2d\u00a0i\u00a0\/\u884c\u5305\u542b\u4e24\u4e2a\u6574\u6570\u00a0ui\u00a0\u548c\u00a0vi\u00a0(\u00a01\u2264ui,vi\u2264n\u00a0,\u00a0ui\u2260vi\u00a0)&#8211;\u5373\u00a0i\u00a0\/\u6865\u6240\u8fde\u63a5\u7684\u4e24\u5ea7\u623f\u5c4b\u3002<\/p>\n<p>\u53ef\u4ee5\u4fdd\u8bc1\u6240\u6709\u7684\u00a0n\u00a0\u623f\u5b50\u90fd\u88ab\u6865\u8fde\u63a5\u8d77\u6765&#xff0c;\u800c\u4e14\u6ca1\u6709\u4e24\u5ea7\u6865\u8fde\u63a5\u540c\u4e00\u5bf9\u623f\u5b50\u3002<\/p>\n<p>\u4fdd\u8bc1\u6240\u6709\u6d4b\u8bd5\u7528\u4f8b\u7684\u00a0n\u00a0\u4e4b\u548c\u4e0d\u8d85\u8fc7\u00a02e5\u00a0&#xff0c;\u6240\u6709\u6d4b\u8bd5\u7528\u4f8b\u7684\u00a0m\u00a0\u4e4b\u548c\u4e0d\u8d85\u8fc7\u00a02e5\u00a0\u3002<\/p>\n<p>\u8f93\u51fa<\/p>\n<p>\u5bf9\u4e8e\u6bcf\u4e2a\u6d4b\u8bd5\u7528\u4f8b&#xff0c;\u8f93\u51fa\u4e00\u4e2a\u6574\u6570 &#8211; \u6cbf\u6cb3\u6392\u5217\u00a0n\u00a0\u5ea7\u623f\u5c4b\u7684\u65b9\u5f0f\u6570&#xff0c;\u6a21\u6570\u4e3a\u00a0109&#043;7\u00a0\u3002<\/p>\n<\/p>\n<h2 id=\"%E4%BA%8C%E3%80%81%E6%80%9D%E8%B7%AF\">\u4e8c\u3001\u601d\u8def<\/h2>\n<p>\u00a0 \u4e8e\u6211\u975e\u5e38\u60ca\u8273\u7684\u601d\u8def&#xff0c;\u8d5b\u65f6\u6ca1\u6709\u60f3\u51fa\u6765\u3002<\/p>\n<p>https:\/\/codeforces.com\/blog\/entry\/145357<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u8bc1\u660e&#xff0c;Destinyland \u7684\u5730\u56fe\u4e0d\u5305\u542b\u5faa\u73af\u3002<\/p>\n<p>\u8bf7\u770b\u4e0b\u9762\u7684\u5730\u56fe&#xff1a; \u00a0<\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" alt=\" \" height=\"167\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812171000-689b75681e166.png\" width=\"160\" \/><\/p>\n<p>\u8bc1\u660e\u53ea\u6709\u5f53\u4e14\u4ec5\u5f53\u4e00\u68f5\u6811\u4e0d\u5305\u542b\u7c7b\u4f3c\u4e8e\u6240\u793a\u7684\u5b50\u6811\u65f6&#xff0c;\u5b83\u624d\u662f\u6709\u6548\u7684 &#034;\u76ee\u7684\u5730 &#034;\u56fe\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eec\u628a Destinyland \u6811\u7684\u6240\u6709\u53f6\u5b50\u90fd\u53bb\u6389&#xff0c;\u5269\u4e0b\u7684\u56fe\u5f62\u5c31\u4f1a\u5f62\u6210\u4e00\u6761\u7b80\u5355\u7684\u8def\u5f84\u3002<\/p>\n<p>\u5047\u8bbe\u00a0G\u00a0\u662f\u76ee\u7684\u5730\u56fe\u7684\u56fe\u5f62\u3002<\/p>\n<p>\u5982\u679c\u00a0G\u00a0\u7684\u5b50\u56fe\u00a0H\u00a0\u4e0d\u53ef\u80fd\u662f\u6709\u6548\u7684 &#034;\u76ee\u7684\u5730 &#034;\u56fe&#xff0c;\u90a3\u4e48\u00a0G\u00a0\u672c\u8eab\u4e5f\u4e0d\u53ef\u80fd\u662f\u6709\u6548\u7684\u3002<\/p>\n<p>\u4e3a\u4e86\u8bc1\u660e\u8fd9\u4e00\u70b9&#xff0c;\u8bf7\u5047\u8bbe\u00a0G\u00a0\u6709\u6548&#xff0c;\u800c\u00a0H\u00a0\u65e0\u6548\u3002\u90a3\u4e48&#xff0c;\u901a\u8fc7\u5220\u9664\u4e0d\u5728\u00a0H\u00a0\u4e2d\u7684\u9876\u70b9\u548c\u8fb9&#xff0c;\u6211\u4eec\u5f97\u5230\u7684\u5b50\u56fe\u00a0H\u00a0\u4e5f\u5e94\u8be5\u662f\u6709\u6548\u7684\u3002\u4f46\u4e8b\u5b9e\u5e76\u975e\u5982\u6b64&#xff01;\u8fd9\u4e0e\u6211\u4eec\u7684\u5047\u8bbe\u76f8\u77db\u76fe&#xff0c;\u6240\u4ee5\u00a0G\u00a0\u4e5f\u4e0d\u53ef\u80fd\u6709\u6548\u3002<\/p>\n<p>\u5b9a\u7406 1&#xff1a;\u00a0\u4efb\u4f55\u957f\u5ea6\u7684\u5faa\u73af\u90fd\u4e0d\u80fd**\u662f\u6709\u6548\u7684 &#034;\u76ee\u7684\u5730 &#034;\u56fe\u3002 \u8bc1\u660e&#xff1a;\u00a0\u5047\u8bbe\u76f8\u53cd\u3002\u5047\u8bbe\u00a0v\u00a0\u662f\u5317\u8fb9\u6700\u5de6\u8fb9\u7684\u623f\u5b50\u3002\u5b83\u5728\u5357\u8fb9\u6709\u4e24\u4e2a\u90bb\u5c45\u3002\u5de6\u8fb9\u7684\u623f\u5b50\u662f\u00a0L\u00a0&#xff0c;\u53e6\u4e00\u4e2a\u662f\u00a0R\u00a0\u3002\u7531\u4e8e\u00a0L\u00a0\u9664\u4e86\u00a0v\u00a0\u4e4b\u5916\u80af\u5b9a\u8fd8\u6709\u53e6\u4e00\u4e2a\u90bb\u5c45&#xff0c;\u8be5\u90bb\u5c45\u4e0d\u53ef\u80fd\u5728\u5357\u4fa7&#xff0c;\u56e0\u6b64\u5b83\u80af\u5b9a\u5728\u5317\u4fa7\u3002\u7136\u800c&#xff0c;\u7531\u4e8e\u00a0v\u00a0\u662f\u6700\u5de6\u8fb9\u7684\u8282\u70b9&#xff0c;\u6240\u4ee5\u8fd9\u4e2a\u90bb\u5c45\u5fc5\u987b\u5728\u00a0v\u00a0\u7684\u53f3\u8fb9&#xff0c;\u800c\u00a0L\u00a0\u548c\u8fd9\u4e2a\u90bb\u5c45\u4e4b\u95f4\u7684\u8fb9\u5c06\u7a7f\u8fc7\u8fb9\u00a0v\u00a0&#8211;\u00a0L\u00a0\u3002\u8fd9\u4e00\u77db\u76fe\u8868\u660e&#xff0c;\u00a0L\u00a0\u9664\u4e86\u00a0v\u00a0\u4e4b\u5916\u4e0d\u53ef\u80fd\u6709\u5176\u4ed6\u90bb\u5c45&#xff0c;\u8fd9\u4e0e\u6211\u4eec\u5047\u8bbe\u7684\u56fe\u5f62\u662f\u4e00\u4e2a\u5faa\u73af\u76f8\u77db\u76fe\u3002<\/p>\n<p>\u5b9a\u7406 2&#xff1a;\u00a0\u4e0b\u9762\u8fd9\u68f5\u6811\u4e0d\u53ef\u80fd\u662f\u6709\u6548\u7684\u76ee\u7684\u5730\u56fe&#xff1a;<\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" alt=\" \" height=\"167\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812171000-689b75681e166.png\" width=\"160\" \/><\/p>\n<p>\u00a0\u8bc1\u660e&#xff1a;\u00a0\u9876\u70b9\u00a02\u00a0\u3001\u00a03\u00a0\u548c\u00a04\u00a0\u90fd\u4f4d\u4e8e\u9876\u70b9\u00a01\u00a0\u7684\u5bf9\u8fb9\u3002\u5982\u679c\u6211\u4eec\u5c06\u5b83\u4eec\u4ece\u5de6\u5230\u53f3\u4f9d\u6b21\u6392\u5217\u4e3a\u00a0u1\u00a0\u3001\u00a0u2\u00a0\u548c\u00a0u3\u00a0&#xff0c;\u90a3\u4e48\u00a0u2\u00a0\u7684\u90bb\u8fb9\u5fc5\u7136\u4f1a\u4e0e\u8fb9\u00a01\u00a0&#8211;\u00a0u1\u00a0\u6216\u00a01\u00a0&#8211;\u00a0u3\u00a0\u5f62\u6210\u4ea4\u53c9\u3002\u56e0\u6b64&#xff0c;\u4e0d\u53ef\u80fd\u5c06\u8fd9\u68f5\u6811\u7684\u9876\u70b9\u6392\u5217\u6210\u6709\u6548\u7684 Destinyland \u5e03\u5c40\u3002<\/p>\n<p>\u6839\u636e\u7b49\u5f0f 1\u00a0\u548c\u7b49\u5f0f 2&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa\u5982\u4e0b\u7ed3\u8bba&#xff1a;<\/p>\n<ul>\n<li>G\u00a0\u4e00\u5b9a\u662f\u4e00\u68f5\u6811\u3002<\/li>\n<li>G\u00a0\u4e2d\u6ca1\u6709\u9876\u70b9\u4e0e\u4e09\u4e2a\u6216\u4e09\u4e2a\u4ee5\u4e0a\u7684\u975e\u53f6\u5b50\u90bb\u63a5\u70b9\u76f8\u8fde\u3002<\/li>\n<\/ul>\n<p>\u73b0\u5728&#xff0c;\u5220\u9664\u6240\u6709\u53f6\u8282\u70b9\u3002\u7531\u4e8e\u8fd9\u4e9b\u53f6\u8282\u70b9\u59cb\u7ec8\u662f\u975e\u526a\u5207\u9876\u70b9(\u5373\u5b83\u4eec\u7684\u79fb\u9664\u4e0d\u4f1a\u65ad\u5f00\u6811\u7684\u8fde\u63a5)&#xff0c;\u5269\u4f59\u7684\u56fe\u5f62(\u5982\u679c\u5b58\u5728\u7684\u8bdd)\u4ecd\u7136\u662f\u8fde\u63a5\u7684\u3002\u7531\u4e8e\u6240\u6709\u5269\u4f59\u9876\u70b9\u7684\u5ea6\u6570\u6700\u591a\u4e3a\u00a02\u00a0\u3002\u6240\u4ee5\u5f97\u5230\u7684\u7ed3\u6784\u4e00\u5b9a\u662f\u8def\u5f84\u3002<\/p>\n<p>\u60c5\u51b5 1&#xff1a;\u00a0\u79fb\u9664\u6811\u53f6\u540e&#xff0c;\u56fe\u53d8\u6210\u7a7a\u7684\u3002 \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b&#xff0c;\u539f\u59cb\u56fe\u5f62\u53ea\u6709\u4e00\u6761\u8fb9\u3002\u6240\u4ee5\u7b54\u6848\u5c31\u662f\u00a02\u00a0\u3002<\/p>\n<p>\u60c5\u51b5 2&#xff1a;\u00a0\u53ea\u5269\u4e0b\u4e00\u4e2a\u9876\u70b9\u3002 \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b&#xff0c;\u539f\u6765\u7684\u6811\u662f\u4e00\u9897\u661f\u3002\u6839\u636e\u6211\u4eec\u628a\u4e2d\u5fc3\u9876\u70b9\u653e\u5728\u54ea\u4e00\u8fb9&#xff0c;\u4ee5\u53ca\u5982\u4f55\u6392\u5217\u53f6\u5b50&#xff0c;\u7b54\u6848\u662f&#xff1a;\u00a02\u00d7(n\u22121)!\u00a0\u3002<\/p>\n<p>\u60c5\u51b5 3&#xff1a;\u00a0\u5269\u4e0b\u4e24\u4e2a\u76f8\u8fde\u7684\u975e\u53f6\u9876\u70b9\u00a0u\u00a0\u548c\u00a0v\u00a0\u3002 \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b&#xff0c;\u6709\u00a04\u00a0\u79cd\u6709\u6548\u7684\u653e\u7f6e\u65b9\u5f0f&#xff0c;\u8fd9\u53d6\u51b3\u4e8e\u54ea\u4e00\u4e2a\u9876\u70b9\u4f4d\u4e8e\u5317\u4fa7&#xff0c;\u4ee5\u53ca\u5b83\u4eec\u76f8\u90bb\u7684\u53f6\u5b50\u662f\u5982\u4f55\u56f4\u7ed5\u53e6\u4e00\u4e2a\u9876\u70b9\u6392\u5217\u7684\u3002(\u6ce8&#xff1a;**\u00a0u\u00a0\u548c\u00a0v\u00a0\u4e0d\u53ef\u80fd\u5728\u5bf9\u65b9\u7684\u4e24\u8fb9\u90fd\u6709\u90bb\u63a5\u53f6&#xff09;\u3002 \u6240\u4ee5\u7b54\u6848\u662f&#xff1a;\u00a04\u00d7(du\u22121)!\u00d7(dv\u22121)!\u00a0&#xff0c;\u5176\u4e2d\u00a0du\u00a0\u548c\u00a0dv\u00a0\u5206\u522b\u662f\u00a0u\u00a0\u548c\u00a0v\u00a0\u7684\u5ea6\u6570\u3002<\/p>\n<p>\u6848\u4f8b 4&#xff1a;\u00a0\u5269\u4e0b\u7684\u7ed3\u6784\u662f\u4e00\u6761\u957f\u5ea6\u81f3\u5c11\u4e3a\u00a03\u00a0\u7684\u8def\u5f84\u3002 \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b&#xff0c;\u6211\u4eec\u6709\u00a04\u00a0\u79cd\u6709\u6548\u7684\u653e\u7f6e\u65b9\u6cd5\u3002\u8fd9\u53d6\u51b3\u4e8e\u5c06\u54ea\u4e9b\u9876\u70b9\u653e\u7f6e\u5728\u5317\u4fa7&#xff0c;\u4ee5\u53ca\u5982\u4f55\u653e\u7f6e\u81f3\u5c11\u6709\u4e24\u4e2a\u9876\u70b9\u7684\u4e00\u4fa7\u7684\u4e24\u4e2a\u9876\u70b9\u3002(\u7531\u4e8e\u8be5\u8def\u5f84\u81f3\u5c11\u6709\u00a03\u00a0\u4e2a\u9876\u70b9&#xff0c;\u56e0\u6b64\u4e0d\u5b58\u5728\u51b2\u7a81&#xff09;\u3002<\/p>\n<p>\u73b0\u5728&#xff0c;\u6211\u4eec\u53ea\u9700\u8981\u5b89\u6392\u4e0e\u6bcf\u4e2a\u9876\u70b9\u76f8\u90bb\u7684\u53f6\u5b50\u7684\u76f8\u5bf9\u4f4d\u7f6e\u3002\u56e0\u4e3a\u5b83\u4eec\u76f8\u5bf9\u4e8e\u5176\u4ed6\u9876\u70b9\u7684\u4f4d\u7f6e\u53ea\u53d6\u51b3\u4e8e\u4e3b\u8def\u5f84\u7684\u56db\u79cd\u6392\u5217\u65b9\u5f0f\u3002\u8fd9\u4e00\u70b9\u7684\u8bc1\u660e\u5f88\u67af\u71e5&#xff0c;\u6211\u4eec\u5c31\u4e0d\u591a\u8bf4\u4e86:)<\/p>\n<p>\u5047\u8bbe\u00a0S\u00a0\u662f\u8def\u5f84\u4e0a\u7684\u9876\u70b9\u96c6\u5408&#xff0c;\u5047\u8bbe\u00a0Sahai\u00a0\u662f\u8fde\u63a5\u9876\u70b9\u00a0i\u00a0\u7684\u53f6\u5b50\u6570\u3002\u90a3\u4e48\u6709\u6548\u5e03\u5c40\u7684\u603b\u6570\u4e3a\u00a04\u00d7\u220fr\u2208S(Sahar!)<\/p>\n<p>\u5b9e\u73b0\u89e3\u6cd5<\/p>\n<li>\u68c0\u67e5\u8f93\u5165\u56fe\u662f\u5426\u4e3a\u6811\u72b6\u56fe\u3002<\/li>\n<li>\u9a8c\u8bc1\u6ca1\u6709\u9876\u70b9\u6709\u4e24\u4e2a\u4ee5\u4e0a\u7684\u975e\u53f6\u5b50\u90bb\u5c45\u3002<\/li>\n<li>\u8ba1\u7b97\u975e\u53f6\u9876\u70b9\u7684\u6570\u91cf<\/li>\n<li>\n<li>\u6839\u636e\u8ba1\u7b97\u7ed3\u679c&#xff0c;\u786e\u5b9a\u54ea\u79cd\u60c5\u51b5\u9002\u7528&#xff0c;\u5e76\u8ba1\u7b97\u76f8\u5e94\u7684\u7b54\u6848\u3002<\/li>\n<\/li>\n<p>\u6574\u4e2a\u7b97\u6cd5\u7684\u8fd0\u884c\u65f6\u95f4\u4e3a\u00a0O(n)\u00a0\u3002&#xff01;&#xff01;&#xff01;<\/p>\n<h3 id=\"%E6%A0%87%E7%A8%8B%EF%BC%88%E5%AE%98%E6%96%B9%E4%BB%A3%E7%A0%81%EF%BC%89\">\u6807\u7a0b&#xff08;\u5b98\u65b9\u4ee3\u7801&#xff09;<\/h3>\n<p>#include &lt;bits\/stdc&#043;&#043;.h&gt;<br \/>\nusing namespace std;<\/p>\n<p>#define SZ(x) int(x.size())<\/p>\n<p>const int  MOD    &#061; 1e9  &#043; 7;<br \/>\nconst int MXN    &#061; 2e5  &#043; 5;<\/p>\n<p>int n, m, fact[MXN];<br \/>\nvector&lt;int&gt; adj[MXN];<\/p>\n<p>int32_t main() {<br \/>\n    cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);<br \/>\n    fact[0] &#061; 1;<br \/>\n    for (int i &#061; 1; i &lt; MXN; i&#043;&#043;)<br \/>\n        fact[i] &#061; (1ll * fact[i-1] * i) % MOD;<br \/>\n    int T;<br \/>\n    cin &gt;&gt; T;<br \/>\n    while (T&#8211;) {<br \/>\n        cin &gt;&gt; n &gt;&gt; m;<br \/>\n        for (int i &#061; 1; i &lt;&#061; n; i&#043;&#043;) adj[i].clear();<br \/>\n        for (int i &#061; 1; i &lt;&#061; m; i&#043;&#043;) {<br \/>\n            int u, v;<br \/>\n            cin &gt;&gt; u &gt;&gt; v;<br \/>\n            adj[u].push_back(v);<br \/>\n            adj[v].push_back(u);<br \/>\n        }<\/p>\n<p>        long long ans &#061; 2;<br \/>\n        int tl &#061; 0;<br \/>\n        if (m &gt;&#061; n) ans &#061; 0;<br \/>\n        for (int u &#061; 1; u &lt;&#061; n; u&#043;&#043;) {<br \/>\n            if (adj[u].size() &gt; 1) {<br \/>\n                int x &#061; 0;<br \/>\n                for (int v : adj[u]) {<br \/>\n                    x &#043;&#061; (SZ(adj[v]) &#061;&#061; 1);<br \/>\n                }<br \/>\n                if (x &gt;&#061; SZ(adj[u]) &#8211; 2) (ans *&#061; fact[x]) %&#061; MOD;<br \/>\n                else ans &#061; 0;<br \/>\n            } else tl &#043;&#043;;<br \/>\n        }<br \/>\n        if (tl &lt; n-1) tl &#061; 2; else tl &#061; 1;<br \/>\n        cout &lt;&lt; (ans * tl % MOD) &lt;&lt; &#039;\\\\n&#039;;<br \/>\n    }<br \/>\n    return 0;<br \/>\n}<\/p>\n<hr \/>\n<h2 id=\"%E6%80%BB%E7%BB%93\">\u603b\u7ed3<\/h2>\n<p>thank you for listen ,\u559c\u6b22\u7684\u8bdd\u70b9\u4e2a\u8d5e\u5427<\/p>\n<p>\u6211\u8bf4&#xff0c;\u4f60\u6700\u559c\u6b22\u54ea\u4e2a\u5b63\u8282&#xff1f;\u201d<\/p>\n<p>\u201c\u79cb\u5929\u201d\u201c\u4e3a\u4ec0\u4e48\u4e0d\u662f\u6625\u5929\u201d<\/p>\n<p>\u201c\u6625\u5929&#xff0c;\u597d\u591a\u611f\u89c9\u6324\u5728\u4e00\u8d77&#xff0c;\u7d2f\u4eba\u5462&#xff0c;\u79cb\u5929\u591a\u597d\u201d<\/p>\n<p>\u201c\u5012\u4e0d\u5982\u8bf4\u90c1\u90c1\u8471\u8471\u5f97\u8ba9\u4eba\u5ac9\u5992\u201d<\/p>\n<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"592\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812171000-689b756842cf1.png\" width=\"1082\" 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