{"id":1751,"date":"2021-08-28T20:38:47","date_gmt":"2021-08-28T12:38:47","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=1751"},"modified":"2021-08-28T20:38:47","modified_gmt":"2021-08-28T12:38:47","slug":"codeforces-round-741","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/codeforces-round-741\/","title":{"rendered":"Codeforces Round #741"},"content":{"rendered":"<h1><span class=\"ez-toc-section\" id=\"%E4%BC%A0%E9%80%81%E9%97%A8\"><\/span>\u4f20\u9001\u95e8<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p><a href=\"https:\/\/codeforces.com\/contest\/1562\">https:\/\/codeforces.com\/contest\/1562<\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69ed69bc2c7f3\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69ed69bc2c7f3\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.shuizilong.com\/house\/archives\/codeforces-round-741\/#%E4%BC%A0%E9%80%81%E9%97%A8\" title=\"\u4f20\u9001\u95e8\">\u4f20\u9001\u95e8<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.shuizilong.com\/house\/archives\/codeforces-round-741\/#Problem_B_Scenes_From_a_Memory\" title=\"Problem B. Scenes From a Memory\">Problem B. Scenes From a Memory<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.shuizilong.com\/house\/archives\/codeforces-round-741\/#Problem_C_Rings\" title=\"Problem C. Rings\">Problem C. Rings<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.shuizilong.com\/house\/archives\/codeforces-round-741\/#Problem_E_Rescue_Niwen\" title=\"Problem E. Rescue Niwen!\">Problem E. Rescue Niwen!<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>\u9760\u5b57\u7b26\u4e32\u9898\u6da8\u4e86\u70b9\u5206 > &lt;\u3001<\/p>\n<h1><span class=\"ez-toc-section\" id=\"Problem_B_Scenes_From_a_Memory\"><\/span>Problem B. Scenes From a Memory<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e0d\u5305\u542b\u6570\u5b57 0 \u7684\u6570\uff0c\u8981\u6c42\u4fdd\u7559\u6700\u5c11\u7684\u6570\u5b57\uff0c\u4f7f\u5f97\u6700\u540e\u4e0d\u662f\u7d20\u6570\uff0c\u6709\u591a\u89e3\u4efb\u610f\u8f93\u51fa\u4e00\u7ec4\u5373\u53ef\uff0c\u4fdd\u8bc1\u4e00\u5b9a\u6709\u89e3\u3002<br \/>\n\u5148\u5199\u4e2a\u4fdd\u7559\u6570\u5b57\u5c3d\u53ef\u80fd\u5c11\u7684\u7206\u641c\uff0c\u7136\u540e\u679c\u65ad\u731c\u4e00\u4e0b\u6700\u540e\u4fdd\u7559\u7684\u6570\u5b57\u4e0d\u4f1a\u592a\u591a\u3002\u3002\u3002<\/p>\n<p>\u5177\u4f53\u7684\u8bdd\uff0c\u5c31\u662f\u5982\u679c\u5b58\u5728 1 4 6 8 9 \u90a3\u4e48\u663e\u7136\u5c31\u662f 1 \u4f4d\uff0c\u5269\u4e0b\u7684\u53ea\u6709\u3002\u3002<br \/>\n2 3 5 7 \u3002\u3002\u90a3\u4e48\u4e0d\u80fd\u51fa\u73b0\u91cd\u590d\u7684\u6570\uff0c\u5426\u5219\u53ef\u4ee5\u6574\u9664 11\uff0c\u90a3\u4e48\u9e3d\u5de2\u4e00\u4e0b\u65b9\u6848\u5df2\u7ecf\u975e\u5e38\u5c11\u4e86\u3002<br \/>\n\u6700\u540e\u7ed3\u8bba\u8c8c\u4f3c\u662f\u4fdd\u7559 2 \u4f4d\u5373\u53ef\u3002\u3002\u3002<\/p>\n<p>\u5f53\u7136\u7528\u4e0a\u9762\u7684\u7206\u641c\u7684\u8bdd\uff0c\u5176\u5b9e\u4e0d\u7528\u4ed4\u7ec6\u53bb\u63a8\uff0c\u968f\u4fbf\u7ed9\u4e2a\u5dee\u4e0d\u591a\u7684\u4e0a\u754c\u76f4\u63a5\u7206\u8fc7\u53bb\u5373\u53ef\u3002\u3002\u3002<\/p>\n<h1><span class=\"ez-toc-section\" id=\"Problem_C_Rings\"><\/span>Problem C. Rings<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>\u8111\u7ecf\u6025\u8f6c\u5f2f\u3002<\/p>\n<h1><span class=\"ez-toc-section\" id=\"Problem_E_Rescue_Niwen\"><\/span>Problem E. Rescue Niwen!<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>\u633a\u50bb\u7684\u4e00\u773c\u9898\u3002\u3002\u3002\u5957\u4e2a sa \u6a21\u677f\u5c31\u53ef\u4ee5\u5199 dp \u4e86\uff0c\u4e2d\u95f4\u7c7b\u4f3c\u6c42\u91cd\u590d\u5b50\u4e32\uff0c\u8981\u53bb\u6389 lcp\u3002<\/p>\n<pre class=\"brush: cpp; light: false; title: ; toolbar: true; notranslate\" title=\"\">\r\n        LL z = 0;\r\n        REP_1(i, n) {\r\n            dp&#x5B;i] = (n - sa&#x5B;i]);\r\n            FOR(j, 1, i) if (sa&#x5B;j] &lt; sa&#x5B;i]) {\r\n                checkMax(dp&#x5B;i], dp&#x5B;j] + (n  - sa&#x5B;i]) - lcpp(sa&#x5B;i], sa&#x5B;j]) ) ;\r\n            }\r\n\r\n            checkMax(z, dp&#x5B;i]);\r\n        }\r\n        cout &lt;&lt; z &lt;&lt; endl;\r\n<\/pre>\n<p>O(n2) \u7206\u8fc7\u53bb\u5373\u53ef\uff0clcp \u751a\u81f3\u53ef\u4ee5\u66b4\u529b\u5199\u3002\u6240\u4ee5\u8fd9\u4e2a dp \u7684\u590d\u6742\u5ea6\u53ef\u4ee5\u8fdb\u4e00\u6b65\u4f18\u5316\u5417\uff1f<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f20\u9001\u95e8 https:\/\/codeforces.com\/contest\/1562 \u9760\u5b57\u7b26\u4e32\u9898\u6da8\u4e86\u70b9\u5206 > &lt;\u3001 Problem B. Scenes From a Memory \u7ed9\u5b9a\u4e00\u4e2a\u4e0d\u5305\u542b\u6570\u5b57 0 \u7684\u6570\uff0c\u8981\u6c42\u4fdd\u7559\u6700\u5c11\u7684\u6570\u5b57\uff0c\u4f7f\u5f97\u6700\u540e\u4e0d\u662f\u7d20\u6570\uff0c\u6709\u591a\u89e3\u4efb\u610f\u8f93\u51fa\u4e00\u7ec4\u5373\u53ef\uff0c\u4fdd\u8bc1\u4e00\u5b9a\u6709\u89e3\u3002 \u5148\u5199\u4e2a\u4fdd\u7559\u6570\u5b57\u5c3d\u53ef\u80fd\u5c11\u7684\u7206\u641c\uff0c\u7136\u540e\u679c\u65ad\u731c\u4e00\u4e0b\u6700\u540e\u4fdd\u7559\u7684\u6570\u5b57\u4e0d\u4f1a\u592a\u591a\u3002\u3002\u3002 \u5177\u4f53\u7684\u8bdd\uff0c\u5c31\u662f\u5982\u679c\u5b58\u5728 1 4 6 8 9 \u90a3\u4e48\u663e\u7136\u5c31\u662f 1 \u4f4d\uff0c\u5269\u4e0b\u7684\u53ea\u6709\u3002\u3002 2 3 5 7 \u3002\u3002\u90a3\u4e48\u4e0d\u80fd\u51fa\u73b0\u91cd\u590d\u7684\u6570\uff0c\u5426\u5219\u53ef\u4ee5\u6574\u9664 11\uff0c\u90a3\u4e48\u9e3d\u5de2\u4e00\u4e0b\u65b9\u6848\u5df2\u7ecf\u975e\u5e38\u5c11\u4e86\u3002 \u6700\u540e\u7ed3\u8bba\u8c8c\u4f3c\u662f\u4fdd\u7559 2 \u4f4d\u5373\u53ef\u3002\u3002\u3002 \u5f53\u7136\u7528\u4e0a\u9762\u7684\u7206\u641c\u7684\u8bdd\uff0c\u5176\u5b9e\u4e0d\u7528\u4ed4\u7ec6\u53bb\u63a8\uff0c\u968f\u4fbf\u7ed9\u4e2a\u5dee\u4e0d\u591a\u7684\u4e0a\u754c\u76f4\u63a5\u7206\u8fc7\u53bb\u5373\u53ef\u3002\u3002\u3002 Problem C. Rings \u8111\u7ecf\u6025\u8f6c\u5f2f\u3002 Problem E. Rescue Niwen! \u633a\u50bb\u7684\u4e00\u773c\u9898\u3002\u3002\u3002\u5957\u4e2a sa \u6a21\u677f\u5c31\u53ef\u4ee5\u5199 dp \u4e86\uff0c\u4e2d\u95f4\u7c7b\u4f3c\u6c42\u91cd\u590d\u5b50\u4e32\uff0c\u8981\u53bb\u6389 lcp\u3002 LL z = 0; REP_1(i, n) { [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[1],"tags":[],"class_list":["post-1751","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-sf","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1751","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/comments?post=1751"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1751\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=1751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=1751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=1751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}