{"id":1919,"date":"2022-03-07T12:33:17","date_gmt":"2022-03-07T04:33:17","guid":{"rendered":"https:\/\/www.shuizilong.com\/house\/?p=1919"},"modified":"2022-03-09T15:20:38","modified_gmt":"2022-03-09T07:20:38","slug":"codeforces-round-775","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/codeforces-round-775\/","title":{"rendered":"Codeforces Round #775"},"content":{"rendered":"<ul>\n<li><a href=\"https:\/\/codeforces.com\/contest\/1648\">https:\/\/codeforces.com\/contest\/1648<\/a><\/li>\n<li><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/476724675\">https:\/\/zhuanlan.zhihu.com\/p\/476724675<\/a><\/li>\n<li><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/476735877\">https:\/\/zhuanlan.zhihu.com\/p\/476735877<\/a><\/li>\n<\/ul>\n<h2>B. Integral Array<\/h2>\n<p>\u5224\u65ad\u4e00\u4e2a\u5e8f\u5217\u4e2d\u662f\u5426\u5b58\u5728\u8f83\u5927\u6570\u9664\u8f83\u5c0f\u6570\u4e0b\u53d6\u6574\u4e0d\u5c5e\u4e8e\u8be5\u5e8f\u5217\u7684\u60c5\u51b5\u3002<br \/>\n\u6709\u70b9\u4e0a\u6b21 <a href=\"https:\/\/www.shuizilong.com\/house\/archives\/codeforces-round-740\/\">Tourist Round B \u9898<\/a> \u7684\u65e2\u89c6\u611f\uff0c\u6ce8\u610f\u8fd9\u6b21\u522b\u518d\u5199\u6210 O(nsqrtn) \u4e86 \u3002\u3002\u3002<\/p>\n<h2>D. Serious Business<\/h2>\n<p>\u7ed9\u5b9a\u4e09\u884c\u6570\u5b57\uff0c\u8981\u6c42\u5de6\u4e0a\u5230\u53f3\u4e0b\uff0c\u53ea\u80fd\u5411\u53f3 \u548c \u5411\u4e0b\uff0c\u65b9\u683c\u53d6\u6570\uff0c\u521d\u59cb\u4e2d\u95f4\u4e00\u884c\u662f\u5173\u95ed\u7684\uff0c\u7136\u540e\u6709 m \u4e2a\u64cd\u4f5c\uff0c\u6bcf\u6b21\u4e2d\u95f4\u6253\u5f00\u4e00\u4e2a\u533a\u95f4\uff0c<br \/>\n\u4f60\u53ef\u4ee5\u4ece\u4e2d\u9009\u4e00\u4e9b\u64cd\u4f5c\uff0c\u8981\u6c42\u4f7f\u5f97\u6700\u540e\u65b9\u683c\u53d6\u6570\u7684\u7ed3\u679c\u6700\u5927\u3002<\/p>\n<p>\u8fd9\u4e2a\u9898\u6211\u89c9\u5f97\u51fa\u5f97\u975e\u5e38\u4e0d\u9519\uff0c\u9996\u5148\u8bfb\u5b8c\u9898\u76ee\u51e0\u4e4e\u628a\u6211\u8981\u7528\u5206\u6cbb\u544a\u8bc9\u4f60\u4e86\uff0c\u90a3\u4e48\u7b2c\u4e00\u611f\u89c9\u662f\u53bb\u5199\u7ebf\u6bb5\u6811 dp\u3002\u3002\u3002<br \/>\n\u4f46\u662f\u5177\u4f53\u600e\u4e48\u5199\u3002\u3002\u3002\u5c45\u7136\u60f3\u4e0d\u51fa\u6765\u600e\u4e48\u505a\u3002\u3002\u3002<\/p>\n<p>\u8d5b\u540e\u770b\u4e86\u4e00\u4e0b\u679c\u7136\u5c31\u662f\u7ebf\u6bb5\u6811 dp &#8230;\uff08\u4e5f\u6709\u4eba cdq \u5206\u6cbb\u3002\u3002\uff09<br \/>\n<a href=\"https:\/\/codeforces.com\/contest\/1648\/submission\/148591405\">https:\/\/codeforces.com\/contest\/1648\/submission\/148591405<\/a><\/p>\n<p>\u9996\u5148\u6211\u4eec\u4e0d\u59a8\u5f31\u5316\u4e00\u4e0b\u95ee\u9898\uff0c\u7ed9\u4e00\u4e2a\u8986\u76d6\u6574\u4e2a\u533a\u95f4\uff0c\u4e14\u4ee3\u4ef7\u4e3a 0 \u7684\u64cd\u4f5c\uff0c\u90a3\u4e48\u663e\u7136\u53ef\u4ee5\u7ebf\u6bb5\u6811\uff0c\u65b9\u6cd5\u7c7b\u4f3c GSS \u7cfb\u5217\uff0c\u7b80\u5355\u533a\u95f4\u5408\u5e76\u3002\u3002\u3002<br \/>\n\u7136\u540e\u5c31\u662f\u8fd9\u4e2a\u9898\u5389\u5bb3\u7684\u5730\u65b9\uff0c\u6211\u4eec\u53ef\u4ee5\u79bb\u7ebf\u5904\u7406\u6240\u6709\u64cd\u4f5c\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u64cd\u4f5c\uff0c\u5bf9\u8fd9\u4e2a\u64cd\u4f5c\u6240\u8986\u76d6\u7684\u533a\u95f4\u8fdb\u884c\u8be2\u95ee\uff0c\u7d27\u63a5\u7740\uff0c\u5c06\u8fd9\u6b21\u64cd\u4f5c\u6240\u4ea7\u751f\u7684\u5f71\u54cd\uff0c\u52a0\u56de\u5230\u7ebf\u6bb5\u6811\u91cc\u3002\u3002\u3002<br \/>\n\u6211\u89c9\u5f97\u8fd9\u4e2a\u60f3\u6cd5\u8fd8\u662f\u86ee\u5947\u5999\u7684\u3002\u3002\u3002<\/p>\n<h2>E. Air Reform<\/h2>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u8fb9\u6743\u56fe\uff0c\u5b9a\u4e49\u5176\u8865\u56fe\u7684\u6743\u503c\u4e3a\u539f\u56fe\u4e0a\u8fde\u63a5\u4e24\u70b9\u7684\u8def\u5f84\u4e2d\uff0c\u8fb9\u6743\u6700\u5927\u503c\u7684\u6700\u5c0f\u503c\u3002\u95ee\u7528\u540c\u6837\u7684\u65b9\u5f0f\u518d\u4ece\u8865\u56fe\u5f97\u5230\u539f\u56fe\u540e\uff0c\u6bcf\u4e00\u6761\u8fb9\u7684\u6743\u503c\u3002<\/p>\n<p>\u6211\u4eec\u53ea\u8981\u6c42\u51fa\u8865\u56fe\u7684\u6700\u5c0f\u751f\u6210\u6811\uff0c\u5c31\u53ef\u4ee5\u7b80\u5355\u7684\u6c42\u8def\u5f84\u4e0a\u7684\u6700\u5927\u503c\u5f97\u5230\u6700\u7ec8\u7684\u8fb9\u6743\u3002<br \/>\n\u4e8e\u662f\u6211\u4eec\u53ea\u9700\u8981\u6c42\u51fa\u8865\u56fe\u7684\u6700\u5c0f\u751f\u6210\u6811\u5373\u53ef\uff0c\u800c\u8fd9\u4e2a\u53ef\u4ee5\u7b80\u5355\u9b54\u6539\u4e00\u4e0b Kruskal\u3002\u3002\u3002<\/p>\n<p>\u662f\u4e0d\u662f\u611f\u89c9\u6709\u70b9\u50cf #767 \u7684 E \u9898\uff1f<\/p>\n<h2>F. Two Avenues<\/h2>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u56fe\uff0c\u521d\u59cb\u6240\u6709\u8fb9\u6743\u4e3a 0\uff0c\u4f60\u53ef\u4ee5\u9009\u62e9\u5176\u4e2d\u4e24\u6761\u8fb9\uff0c\u5c06\u5b83\u4eec\u7684\u8fb9\u6743\u4fee\u6539\u4e3a 1\u3002<br \/>\n\u7ed9\u5b9a k \u5bf9\u70b9\u5bf9\uff0c\u5b9a\u4e49\u70b9\u5bf9\u7684\u8ddd\u79bb\uff0c\u4e3a\u8fde\u63a5\u8fd9\u4e24\u4e2a\u70b9\u7684\u4e00\u6761\u8def\u5f84\uff0c\u4f7f\u5f97\u7ecf\u8fc7\u7684\u6743\u503c\u548c\u6700\u5c0f\u3002<br \/>\n\u95ee\u5982\u4f55\u9009\u62e9\u8fd9\u4e24\u6761\u8fb9\uff0c\u6700\u5927\u5316 k \u5bf9\u70b9\u5bf9\u7684\u8ddd\u79bb\u548c\u3002<\/p>\n<p>\u989d\uff0c\u6811\u4e0a\u6211\u4f1a\u505a\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/codeforces.com\/contest\/1648 https:\/\/zhuanlan.zhihu.com\/p\/476724675 https:\/\/zhuanlan.zhihu.com\/p\/476735877 B. Integral Array \u5224\u65ad\u4e00\u4e2a\u5e8f\u5217\u4e2d\u662f\u5426\u5b58\u5728\u8f83\u5927\u6570\u9664\u8f83\u5c0f\u6570\u4e0b\u53d6\u6574\u4e0d\u5c5e\u4e8e\u8be5\u5e8f\u5217\u7684\u60c5\u51b5\u3002 \u6709\u70b9\u4e0a\u6b21 Tourist Round B \u9898 \u7684\u65e2\u89c6\u611f\uff0c\u6ce8\u610f\u8fd9\u6b21\u522b\u518d\u5199\u6210 O(nsqrtn) \u4e86 \u3002\u3002\u3002 D. Serious Business \u7ed9\u5b9a\u4e09\u884c\u6570\u5b57\uff0c\u8981\u6c42\u5de6\u4e0a\u5230\u53f3\u4e0b\uff0c\u53ea\u80fd\u5411\u53f3 \u548c \u5411\u4e0b\uff0c\u65b9\u683c\u53d6\u6570\uff0c\u521d\u59cb\u4e2d\u95f4\u4e00\u884c\u662f\u5173\u95ed\u7684\uff0c\u7136\u540e\u6709 m \u4e2a\u64cd\u4f5c\uff0c\u6bcf\u6b21\u4e2d\u95f4\u6253\u5f00\u4e00\u4e2a\u533a\u95f4\uff0c \u4f60\u53ef\u4ee5\u4ece\u4e2d\u9009\u4e00\u4e9b\u64cd\u4f5c\uff0c\u8981\u6c42\u4f7f\u5f97\u6700\u540e\u65b9\u683c\u53d6\u6570\u7684\u7ed3\u679c\u6700\u5927\u3002 \u8fd9\u4e2a\u9898\u6211\u89c9\u5f97\u51fa\u5f97\u975e\u5e38\u4e0d\u9519\uff0c\u9996\u5148\u8bfb\u5b8c\u9898\u76ee\u51e0\u4e4e\u628a\u6211\u8981\u7528\u5206\u6cbb\u544a\u8bc9\u4f60\u4e86\uff0c\u90a3\u4e48\u7b2c\u4e00\u611f\u89c9\u662f\u53bb\u5199\u7ebf\u6bb5\u6811 dp\u3002\u3002\u3002 \u4f46\u662f\u5177\u4f53\u600e\u4e48\u5199\u3002\u3002\u3002\u5c45\u7136\u60f3\u4e0d\u51fa\u6765\u600e\u4e48\u505a\u3002\u3002\u3002 \u8d5b\u540e\u770b\u4e86\u4e00\u4e0b\u679c\u7136\u5c31\u662f\u7ebf\u6bb5\u6811 dp &#8230;\uff08\u4e5f\u6709\u4eba cdq \u5206\u6cbb\u3002\u3002\uff09 https:\/\/codeforces.com\/contest\/1648\/submission\/148591405 \u9996\u5148\u6211\u4eec\u4e0d\u59a8\u5f31\u5316\u4e00\u4e0b\u95ee\u9898\uff0c\u7ed9\u4e00\u4e2a\u8986\u76d6\u6574\u4e2a\u533a\u95f4\uff0c\u4e14\u4ee3\u4ef7\u4e3a 0 \u7684\u64cd\u4f5c\uff0c\u90a3\u4e48\u663e\u7136\u53ef\u4ee5\u7ebf\u6bb5\u6811\uff0c\u65b9\u6cd5\u7c7b\u4f3c GSS \u7cfb\u5217\uff0c\u7b80\u5355\u533a\u95f4\u5408\u5e76\u3002\u3002\u3002 \u7136\u540e\u5c31\u662f\u8fd9\u4e2a\u9898\u5389\u5bb3\u7684\u5730\u65b9\uff0c\u6211\u4eec\u53ef\u4ee5\u79bb\u7ebf\u5904\u7406\u6240\u6709\u64cd\u4f5c\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u64cd\u4f5c\uff0c\u5bf9\u8fd9\u4e2a\u64cd\u4f5c\u6240\u8986\u76d6\u7684\u533a\u95f4\u8fdb\u884c\u8be2\u95ee\uff0c\u7d27\u63a5\u7740\uff0c\u5c06\u8fd9\u6b21\u64cd\u4f5c\u6240\u4ea7\u751f\u7684\u5f71\u54cd\uff0c\u52a0\u56de\u5230\u7ebf\u6bb5\u6811\u91cc\u3002\u3002\u3002 \u6211\u89c9\u5f97\u8fd9\u4e2a\u60f3\u6cd5\u8fd8\u662f\u86ee\u5947\u5999\u7684\u3002\u3002\u3002 E. Air Reform \u7ed9\u5b9a\u4e00\u4e2a\u8fb9\u6743\u56fe\uff0c\u5b9a\u4e49\u5176\u8865\u56fe\u7684\u6743\u503c\u4e3a\u539f\u56fe\u4e0a\u8fde\u63a5\u4e24\u70b9\u7684\u8def\u5f84\u4e2d\uff0c\u8fb9\u6743\u6700\u5927\u503c\u7684\u6700\u5c0f\u503c\u3002\u95ee\u7528\u540c\u6837\u7684\u65b9\u5f0f\u518d\u4ece\u8865\u56fe\u5f97\u5230\u539f\u56fe\u540e\uff0c\u6bcf\u4e00\u6761\u8fb9\u7684\u6743\u503c\u3002 \u6211\u4eec\u53ea\u8981\u6c42\u51fa\u8865\u56fe\u7684\u6700\u5c0f\u751f\u6210\u6811\uff0c\u5c31\u53ef\u4ee5\u7b80\u5355\u7684\u6c42\u8def\u5f84\u4e0a\u7684\u6700\u5927\u503c\u5f97\u5230\u6700\u7ec8\u7684\u8fb9\u6743\u3002 \u4e8e\u662f\u6211\u4eec\u53ea\u9700\u8981\u6c42\u51fa\u8865\u56fe\u7684\u6700\u5c0f\u751f\u6210\u6811\u5373\u53ef\uff0c\u800c\u8fd9\u4e2a\u53ef\u4ee5\u7b80\u5355\u9b54\u6539\u4e00\u4e0b Kruskal\u3002\u3002\u3002 \u662f\u4e0d\u662f\u611f\u89c9\u6709\u70b9\u50cf #767 \u7684 E \u9898\uff1f F. Two [&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-1919","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-uX","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1919","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=1919"}],"version-history":[{"count":1,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1919\/revisions"}],"predecessor-version":[{"id":1920,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1919\/revisions\/1920"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=1919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=1919"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=1919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}