{"id":66205,"date":"2023-12-18T22:35:04","date_gmt":"2023-12-18T14:35:04","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=66205"},"modified":"2023-12-18T22:35:07","modified_gmt":"2023-12-18T14:35:07","slug":"%e6%8e%92%e5%88%97%e7%bb%84%e5%90%88a%e5%92%8cc%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/66205.html","title":{"rendered":"\u6392\u5217\u7ec4\u5408a\u548cc\u7684\u533a\u522b"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote\">\n<p>\u6392\u5217\u7ec4\u5408a\u548cc\u7684\u533a\u522b\uff1a1.\u5b9a\u4e49\u4e0d\u540c\uff1b2.\u8ba1\u7b97\u65b9\u6cd5\u4e0d\u540c\uff1b3.\u5b9e\u9645\u5e94\u7528\u4e0d\u540c\u3002\u6392\u5217\u548c\u7ec4\u5408\u662f\u6570\u5b66\u4e2d\u7684\u4e24\u4e2a\u91cd\u8981\u6982\u5ff5\uff0c\u5b83\u4eec\u5728\u5404\u79cd\u9886\u57df\u90fd\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\u3002\u867d\u7136\u5b83\u4eec\u90fd\u6d89\u53ca\u5230\u4ece\u4e00\u7ec4\u5143\u7d20\u4e2d\u9009\u62e9\u5143\u7d20\u7684\u65b9\u5f0f\uff0c\u4f46\u5b83\u4eec\u5728\u9009\u62e9\u7684\u89c4\u5219\u548c\u8ba1\u7b97\u65b9\u6cd5\u4e0a\u6709\u7740\u660e\u663e\u7684\u533a\u522b\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">1.\u5b9a\u4e49\u4e0d\u540c<strong><\/strong><\/h2>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-layout-1 wp-block-group-is-layout-flex\">\n<p>\u6392\u5217\u662f\u6307\u4ece\u4e00\u7ec4\u5143\u7d20\u4e2d\u9009\u62e9\u82e5\u5e72\u4e2a\u5143\u7d20\uff0c\u6309\u7167\u4e00\u5b9a\u7684\u987a\u5e8f\u6392\u5217\u7684\u65b9\u5f0f\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u6392\u5217\u8003\u8651\u4e86\u5143\u7d20\u7684\u987a\u5e8f\u3002\u4f8b\u5982\uff0c\u4ece1\u30012\u30013\u8fd9\u4e09\u4e2a\u6570\u5b57\u4e2d\u9009\u62e9\u4e24\u4e2a\u6570\u5b57\u8fdb\u884c\u6392\u5217\uff0c\u53ef\u4ee5\u5f97\u5230(1,2\uff09\u3001(2,1\uff09\u3001(1,3\uff09\u3001(3,1\uff09\u3001(2,3\uff09\u3001(3,2\uff09\u8fd9\u516d\u79cd\u4e0d\u540c\u7684\u6392\u5217\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p>\u7ec4\u5408\u5219\u662f\u6307\u4ece\u4e00\u7ec4\u5143\u7d20\u4e2d\u9009\u62e9\u82e5\u5e72\u4e2a\u5143\u7d20\uff0c\u800c\u4e0d\u8003\u8651\u5b83\u4eec\u7684\u987a\u5e8f\u3002\u7ec4\u5408\u53ea\u5173\u6ce8\u5143\u7d20\u7684\u9009\u62e9\uff0c\u4e0d\u5173\u5fc3\u5143\u7d20\u7684\u6392\u5217\u987a\u5e8f\u3002\u4ee5\u540c\u6837\u7684\u4e09\u4e2a\u6570\u5b57\u4e3a\u4f8b\uff0c\u4ece\u4e2d\u9009\u62e9\u4e24\u4e2a\u6570\u5b57\u8fdb\u884c\u7ec4\u5408\uff0c\u53ef\u4ee5\u5f97\u5230(1, 2)\u3001(1, 3)\u3001(2, 3)\u8fd9\u4e09\u79cd\u4e0d\u540c\u7684\u7ec4\u5408\u65b9\u5f0f\uff0c\u4e0d\u8003\u8651\u5b83\u4eec\u7684\u6392\u5217\u987a\u5e8f\u3002<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u8ba1\u7b97\u65b9\u6cd5\u4e0d\u540c<strong><\/strong><\/h2>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-layout-2 wp-block-group-is-layout-flex\">\n<p>\u6392\u5217\u7684\u8ba1\u7b97\u65b9\u6cd5\u901a\u5e38\u4f7f\u7528\u6392\u5217\u516c\u5f0f\uff0c\u5373n\u4e2a\u5143\u7d20\u4e2d\u9009\u53d6r\u4e2a\u5143\u7d20\u7684\u6392\u5217\u6570\u4e3aP(n, r) = n! 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