{"id":2047,"date":"2022-11-22T12:16:43","date_gmt":"2022-11-22T04:16:43","guid":{"rendered":"https:\/\/www.shuizilong.com\/house\/?p=2047"},"modified":"2022-12-22T09:01:56","modified_gmt":"2022-12-22T01:01:56","slug":"pinely-round-1","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/pinely-round-1\/","title":{"rendered":"Pinely Round 1"},"content":{"rendered":"<ul>\n<li><a href=\"https:\/\/codeforces.com\/contest\/1750\">https:\/\/codeforces.com\/contest\/1750<\/a><\/li>\n<li><a href=\"https:\/\/t.me\/algorithm_daily_of_minako\/7364\">https:\/\/t.me\/algorithm_daily_of_minako\/7364<\/a><\/li>\n<\/ul>\n<h2>Problem B. Elimination of a Ring<\/h2>\n<p>\u6bd4\u8d5b\u7684\u65f6\u5019\u7b2c\u4e00\u53cd\u5e94\u662f <a href=\"https:\/\/www.spoj.com\/problems\/MUSKET\/\">SPOJ. MUSKET<\/a>\uff0c\u505a\u6cd5\u662f\u7834\u73af\u4e3a\u94fe + O(n3) \u533a\u95f4 dp\u3002\uff08\u8fde\u6570\u636e\u8303\u56f4\u4e5f\u9887\u5177\u8ff7\u60d1\u6027 Orz\u3002\u3002\u3002\uff09<br \/>\n\u4e0d\u8fc7\u611f\u89c9\u4e0d\u592a\u5bf9\u52b2&#8230; \u56e0\u4e3a\u6c42\u7684\u662f\u6700\u5927\u3002\u3002\u3002\u90a3\u4e48\u5982\u679c\u6709\u4e00\u4e2a\u5b64\u7acb\u5143\u7d20\uff0c\u90a3\u4e48\u4e00\u5b9a\u53ef\u4ee5\u501a\u9760\u7740\u8fd9\u4e2a\u5143\u7d20\u4f5c\u4e3a\u5899\uff0c\u7b54\u6848\u4e3a n\u3002<br \/>\n\u8fdb\u4e00\u6b65\uff0c\u6211\u4eec\u53ef\u4ee5\u8bc1\u660e\uff0c\u53ea\u8981\u6709\u5927\u4e8e\u7b49\u4e8e 3 \u79cd\u4ee5\u4e0a\u5143\u7d20\uff0c\u90fd\u53ef\u4ee5\u6700\u540e\u5f52\u7ea6\u5230\u8fd9\u79cd\u60c5\u51b5\uff0c\u7b54\u6848\u540c\u6837\u4e3a n\u3002<br \/>\n\u56e0\u6b64\u53ea\u5269\u4e0b\u4e24\u79cd\u5143\u7d20\u7684\u60c5\u51b5\uff0c\u4f46\u662f\u4e24\u79cd\u5143\u7d20\u65f6 pattern \u662f\u56fa\u5b9a\u7684\u3002\u3002\u3002\u662f 1 2 1 2 &#8230; \u7b54\u6848\u4e3a n\/2 + 1\u3002<\/p>\n<h2>Problem D. Carry Bit<\/h2>\n<p>\u8fd9\u4e2a\u9898 O(nk) \u7c7b Pascal dp \u5f88\u597d\u60f3\u4e5f\u597d\u5199\uff0c\u4f46\u662f\u5bf9\u6211\u4eec\u89e3\u8fd9\u9053\u9898\u5e76\u6ca1\u6709\u7528\uff0c\u56e0\u4e3a\u6211\u4eec\u4e0d\u77e5\u9053\u600e\u4e48\u4f18\u5316\uff0c<br \/>\n\u5373\u4f7f\u662f\u66f4\u7b80\u5355\u7684\u60c5\u51b5\uff0c\u6bd4\u5982\u5982\u4f55\u4ece\u7ec4\u5408\u6570\u7684\u9012\u63a8\u516c\u5f0f\u76f4\u63a5\u5f97\u5230\u901a\u9879\u89e3\u5bf9\u6211\u6765\u8bf4\u4e5f\u662f\u975e\u5e38\u56f0\u96be\u7684\u3002<br \/>\n\uff08Induction \u5f53\u7136\u4e0d\u7b97\u3002\uff09<\/p>\n<p>\u6240\u4ee5\u770b\u5230\u8fd9\u4e2a\u8303\u56f4\u5e94\u8be5\u76f4\u63a5\u8003\u8651\u7ec4\u5408\u65b9\u6cd5\u3002<br \/>\n\u9996\u5148\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u4e00\u4e2a raw \u7684\u516c\u5f0f\u3002\u3002\u3002\u3002Binom(n, k) * p3[n-k]\u3002\u3002<br \/>\n\u8fd9\u4e2a\u516c\u5f0f\u7684\u95ee\u9898\u662f\uff0c\u5bf9\u4e8e\u4e00\u4e9b\u8fde\u7eed\u51fa\u73b0\u7684\u8fdb\u4f4d\u4f4d\u7f6e\uff0c\u4e0d\u9700\u8981\u4e24\u4e2a 1,\u3002\u3002\u56e0\u6b64\u6211\u4eec\u5c11\u7b97\u4e86\u3002<br \/>\n\u6240\u4ee5\u6211\u4eec\u9700\u8981\u679a\u4e3e\u6709\u591a\u5c11\u8fde\u7eed\u7684 1\u3002\u3002\u800c\u8fd9\u7b49\u4ef7\u4e8e\u679a\u4e3e 1 \u53ef\u4ee5\u5206\u6210\u591a\u5c11\u6bb5\u3002<br \/>\n\u5927\u6982\u8fd9\u6837 \/\/ .<em>.<\/em>.<br \/>\n\u679a\u4e3e\u4e4b\u540e\uff0c\u5148\u56fa\u5b9a\u4e0a\u56fe\u4f4d\u7f6e\u7684\u8fd9\u4e9b 0\/1 \u72b6\u6001\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u8ba8\u8bba\u5de6\u8fb9\u7684 . \u5b58\u4e0d\u5b58\u5728\u3002\u3002\u3002<br \/>\n\u5269\u4e0b\u5c31\u662f\u6709\u5f88\u591a * \u548c\u5f88\u591a . \u9700\u8981\u4e22\u5230\u8fd9\u4e9b\u7a7a\u91cc\u3002\u3002\u3002\u90a3\u4e48\u5c31\u662f\u7ecf\u5178\u7684\u63d2\u677f\u6cd5\u3002\u3002<br \/>\n\u5269\u4e0b\u5c31\u5f88 trivial \u4e86\u3002<\/p>\n<h2>Problem E. Make It Connected<\/h2>\n<ol>\n<li>\u8fde\u901a\u56fe,ans=0.<\/li>\n<li>\u5206\u51fa\u51e0\u4e2a\u8054\u901a\u56fe\uff0c\u5982\u679c\u5176\u4e2d\u6709\u4e0d\u662f\u5b8c\u5168\u56fe\u7684\uff0cans=1<\/li>\n<li>\u5982\u679c\u5168\u662f\u5b8c\u5168\u56fe\uff0c\u5982\u679c\u662f2\u4e2a\uff0c\u90a3\u4e48\u5c0f\u7684\u90a3\u4e2a\u5168\u7ffb\uff0cans=min.<\/li>\n<li>3\u4e2a\u6216\u4ee5\u4e0a\u7684\u5b8c\u5168\u56fe\uff0c\u5148\u968f\u4fbf\u7ffb\u4e00\u4e2a\uff0c\u7136\u540e\u5c31\u53d8\u62102\u7684\u60c5\u51b5\u4e86\uff0cans=2<\/li>\n<\/ol>\n<p>\u6bcf\u4e00\u6b65\u90fd\u5f88 trivial\uff08\u53ef\u80fd 2 \u7a0d\u5fae\u96be\u4e00\u70b9\uff0c\u56e0\u4e3a\u8fd8\u8981\u627e\u5224\u5b9a\u6761\u4ef6\uff0c\u5224\u5b9a\u6761\u4ef6\u65f6\uff0c\u53ea\u8981\u4e0d\u662f\u6ee1\u5ea6\u7684\uff0c\u4e14\u6ca1\u6709\u4e00\u4e2a\u6302\u8f7d\u7684\u53f6\u5b50\u5373\u53ef\uff09\uff0c\u8fde\u8d77\u6765\u8fd8\u662f\u5f88\u96be\u7684\u3002\u3002\u3002<\/p>\n<h2>Problem F. Anti-median (Easy Version)<\/h2>\n<p>\u5f00\u59cb\u4e0a\u5f3a\u5ea6\u4e86\u3002\u3002\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/codeforces.com\/contest\/1750 https:\/\/t.me\/algorithm_daily_of_minako\/7364 Problem B. Elimination of a Ring \u6bd4\u8d5b\u7684\u65f6\u5019\u7b2c\u4e00\u53cd\u5e94\u662f SPOJ. MUSKET\uff0c\u505a\u6cd5\u662f\u7834\u73af\u4e3a\u94fe + O(n3) \u533a\u95f4 dp\u3002\uff08\u8fde\u6570\u636e\u8303\u56f4\u4e5f\u9887\u5177\u8ff7\u60d1\u6027 Orz\u3002\u3002\u3002\uff09 \u4e0d\u8fc7\u611f\u89c9\u4e0d\u592a\u5bf9\u52b2&#8230; \u56e0\u4e3a\u6c42\u7684\u662f\u6700\u5927\u3002\u3002\u3002\u90a3\u4e48\u5982\u679c\u6709\u4e00\u4e2a\u5b64\u7acb\u5143\u7d20\uff0c\u90a3\u4e48\u4e00\u5b9a\u53ef\u4ee5\u501a\u9760\u7740\u8fd9\u4e2a\u5143\u7d20\u4f5c\u4e3a\u5899\uff0c\u7b54\u6848\u4e3a n\u3002 \u8fdb\u4e00\u6b65\uff0c\u6211\u4eec\u53ef\u4ee5\u8bc1\u660e\uff0c\u53ea\u8981\u6709\u5927\u4e8e\u7b49\u4e8e 3 \u79cd\u4ee5\u4e0a\u5143\u7d20\uff0c\u90fd\u53ef\u4ee5\u6700\u540e\u5f52\u7ea6\u5230\u8fd9\u79cd\u60c5\u51b5\uff0c\u7b54\u6848\u540c\u6837\u4e3a n\u3002 \u56e0\u6b64\u53ea\u5269\u4e0b\u4e24\u79cd\u5143\u7d20\u7684\u60c5\u51b5\uff0c\u4f46\u662f\u4e24\u79cd\u5143\u7d20\u65f6 pattern \u662f\u56fa\u5b9a\u7684\u3002\u3002\u3002\u662f 1 2 1 2 &#8230; \u7b54\u6848\u4e3a n\/2 + 1\u3002 Problem D. Carry Bit \u8fd9\u4e2a\u9898 O(nk) \u7c7b Pascal dp \u5f88\u597d\u60f3\u4e5f\u597d\u5199\uff0c\u4f46\u662f\u5bf9\u6211\u4eec\u89e3\u8fd9\u9053\u9898\u5e76\u6ca1\u6709\u7528\uff0c\u56e0\u4e3a\u6211\u4eec\u4e0d\u77e5\u9053\u600e\u4e48\u4f18\u5316\uff0c \u5373\u4f7f\u662f\u66f4\u7b80\u5355\u7684\u60c5\u51b5\uff0c\u6bd4\u5982\u5982\u4f55\u4ece\u7ec4\u5408\u6570\u7684\u9012\u63a8\u516c\u5f0f\u76f4\u63a5\u5f97\u5230\u901a\u9879\u89e3\u5bf9\u6211\u6765\u8bf4\u4e5f\u662f\u975e\u5e38\u56f0\u96be\u7684\u3002 \uff08Induction \u5f53\u7136\u4e0d\u7b97\u3002\uff09 \u6240\u4ee5\u770b\u5230\u8fd9\u4e2a\u8303\u56f4\u5e94\u8be5\u76f4\u63a5\u8003\u8651\u7ec4\u5408\u65b9\u6cd5\u3002 \u9996\u5148\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u4e00\u4e2a raw \u7684\u516c\u5f0f\u3002\u3002\u3002\u3002Binom(n, k) * p3[n-k]\u3002\u3002 [&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-2047","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-x1","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/2047","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=2047"}],"version-history":[{"count":6,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/2047\/revisions"}],"predecessor-version":[{"id":2083,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/2047\/revisions\/2083"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=2047"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=2047"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=2047"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}