{"id":822,"date":"2013-09-10T02:59:13","date_gmt":"2013-09-09T18:59:13","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=822"},"modified":"2013-09-10T02:59:13","modified_gmt":"2013-09-09T18:59:13","slug":"spoj-1486-the-ants-in-a-tree","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/spoj-1486-the-ants-in-a-tree\/","title":{"rendered":"SPOJ 1486. The Ants in a Tree"},"content":{"rendered":"<h3>Brief description: <\/h3>\n<p>&#8230;. \u7ed9\u5b9a\u4e00\u4e2a n \u4e2a\u7ed3\u70b9\u7684\u8fb9\u6743\u6811\u3002\u3002\u548c m \u4e2a\u4e8b\u4ef6\u3002\u3002\u3002<code>\uff08s, t, v\uff09<\/code> \u8868\u793a\u4ece\u65f6\u523b <code>0<\/code> \u5f00\u59cb\u3002\u3002\u67d0\u8682\u8681\u4ece <code>s<\/code> \u7ed3\u70b9\u51fa\u53d1\u3002\u3002\u4ee5\u901f\u7387 <code>v<\/code> \u524d\u5f80 <code>t<\/code>\u3002<br \/>\n&#8230; \u95ee\u6574\u4e2a\u8fd0\u52a8\u8fc7\u7a0b\u4e2d\u3002\u3002\u53d1\u751f\u3002meet or chase \u4e8b\u4ef6\u7684\u6b21\u6570\u3002\u3002<br \/>\n\uff08 n <= 10^6, m <= 10^3, \u6570\u636e\u4fdd\u8bc1\u6240\u6709\u8682\u8681\u7684\u901f\u7387\u5747\u4e0d\u76f8\u7b49\uff09\n\n<!--more--><\/p>\n<h3>Analysis: <\/h3>\n<p>\u3002\u4e2a\u4eba\u8ba4\u4e3a\u662f PT07 \u7cfb\u5217\u91cc\u6700\u8d5e\u7684\u4e00\u9053\u9898\u3002\u3002\u7b97\u6cd5\u6846\u67b6\u672c\u8eab\u5e76\u4e0d\u96be\u60f3\u3002\u3002\uff08\u3002\u3002O(nlogn) \u9884\u5904\u7406\u5728\u7ebf lca\u3002\u3002O(m^2) \u679a\u4e3e\u6bcf\u5bf9\u4e8b\u4ef6\u3002\u3002\u603b\u65f6\u95f4\u590d\u6742\u5ea6 O(nlogn + m^2)\u3002\u3002\u3002\uff09<br \/>\n\u3002\u3002\u3002\u96be\u70b9\u662f\u4e00\u65e6\u7ec6\u8282\u51fa\u9519\u3002\u3002\u975e\u5e38\u4e0d\u5bb9\u6613\u8c03\u8bd5\u3002\u3002\uff08\u3002\u3002\u53e6\u5916\u6ce8\u610f\u63a7\u5236\u5e38\u6570\u3002\u3002\u3002\u4f8b\u5982\u5728\u7ebf lca \u7684\u65f6\u5019\u6c42 log2(x) \u5982\u679c\u7528 math \u5e93\u7684\u8bdd\u3002\u3002\u8fd9\u91cc\u4f1a\u76f4\u63a5 TLE \u6210 0 \u5206\u3002\u3002\u3002<\/p>\n<p><a href=\"https:\/\/gist.github.com\/lychees\/6499849\">https:\/\/gist.github.com\/lychees\/6499849<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Brief description: &#8230;. \u7ed9\u5b9a\u4e00\u4e2a n \u4e2a\u7ed3\u70b9\u7684\u8fb9\u6743\u6811\u3002\u3002\u548c m \u4e2a\u4e8b\u4ef6\u3002\u3002\u3002\uff08s, t, v\uff09 \u8868\u793a\u4ece\u65f6\u523b 0 \u5f00\u59cb\u3002\u3002\u67d0\u8682\u8681\u4ece s \u7ed3\u70b9\u51fa\u53d1\u3002\u3002\u4ee5\u901f\u7387 v \u524d\u5f80 t\u3002 &#8230; \u95ee\u6574\u4e2a\u8fd0\u52a8\u8fc7\u7a0b\u4e2d\u3002\u3002\u53d1\u751f\u3002meet or chase \u4e8b\u4ef6\u7684\u6b21\u6570\u3002\u3002 \uff08 n<\/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":[106],"tags":[],"class_list":["post-822","post","type-post","status-publish","format-standard","hentry","category-play-with-trees"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-dg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/822","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=822"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/822\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=822"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=822"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=822"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}