{"id":800,"date":"2013-08-12T19:41:45","date_gmt":"2013-08-12T11:41:45","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=800"},"modified":"2013-08-12T22:53:19","modified_gmt":"2013-08-12T14:53:19","slug":"codechef-august-challenge-2013","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/codechef-august-challenge-2013\/","title":{"rendered":"CodeChef August Challenge 2013"},"content":{"rendered":"<p><!--more--><\/p>\n<h2 style=\"color: #7B5E47;\">Level 2. Sereja and Ballons<\/h2>\n<p>\t\u9996\u5148\u3002\u3002\u3002\u7528\u94fe\u8868\u7ef4\u62a4\u6bcf\u4e2a\u683c\u5b50<br \/>\n\t\u5f53\u67d0\u4e2a\u683c\u5b50\u51cf\u52300\u7684\u65f6\u5019\uff0c\u67e5\u8be2\u5b83\u7684 prev[x]\uff0c\u548c succ[x]<br \/>\n\t\u8bb0\u4f5c a, b\u3002\u3002\u90a3\u4e48\u8fd9\u4e00\u8f6e\u88ab\u5220\u9664\u7684\u533a\u95f4 (l, r) \u6ee1\u8db3<br \/>\n\tl \u5c5e\u4e8e (a, x]<br \/>\n\tr \u5c5e\u4e8e [x, b)<\/p>\n<p>\t\u4e8e\u662f\u5c31\u53d8\u6210\u4e86\u8be2\u95ee\u4e00\u4e2a\u5b50\u77e9\u5f62\u70b9\u7684\u4e2a\u6570\u7684\u95ee\u9898\u3002<br \/>\n\t\u3002\u3002\u3002\u8fd9\u91cc\u6211\u4eec\u7528\u51fd\u6570\u5f0f\u7ebf\u6bb5\u6811<br \/>\n\t\u67e5\u8be2\u4e00\u4e2a\u5b50\u77e9\u5f62\u5c31\u662f\u3002\u3002\u3002<br \/>\n\t<code>T[x].Query(b-1, x) - T[a].Query(b-1, x)<\/code><\/p>\n<h2 style=\"color: #7B5E47;\">Level 2. Music &#038; Lyrics<\/h2>\n<p>\t\u88f8 AC \u81ea\u52a8\u673a\u7206\u8fc7\u53bb\u4e86\u3002\u3002\u3002\u6c42\u66f4\u597d\u505a\u6cd5\u3002\u3002\u3002<\/p>\n<h2 style=\"color: #7B5E47;\">Level 2. Prime Distance On Tree<\/h2>\n<p>\t\u70b9\u5206\u6cbb + FFT<\/p>\n<h2 style=\"color: #7B5E47;\">Level 2. Deleting numbers<\/h2>\n<h3>\u4e3b\u7b56\u7565\u3002\u3002\u3002<\/h3>\n<h4>Stage 1. Naive<\/h4>\n<p>\t  1. \u4ece\u540e\u5f80\u524d\u9010\u4e2a\u5220\u9664\u3002<br \/>\n\t  2. \u4fdd\u7559\u51fa\u73b0\u6b21\u6570\u6700\u591a\u7684\u90a3\u4e2a\u3002\u3002\u5176\u4ed6\u4ece\u540e\u5f80\u524d\u9010\u4e2a\u4e2a\u5220\u9664\u3002\u3002<\/p>\n<h4>Stage 2. \u6811\u72b6\u6570\u7ec4<\/h4>\n<p>\t\u4ece\u540e\u5f80\u524d\u9010\u4e2a\u5220\u9664\u3002\u4f46\u662f\u5c1d\u8bd5\u679a\u4e3e\u6b65\u957f\u3002_L1\u3002\u53d6\u5220\u9664\u4e2a\u6570\u6700\u591a\u7684\u3002\u3002\u3002\u3002<br \/>\n\t\u8fd9\u4e2a\u7b97\u6cd5\u9700\u8981\u7ef4\u62a4\u5220\u9664\u540e\u7684\u5e8f\u5217\u3002\u3002\u521d\u671f\u4f7f\u7528\u7684\u662f STL::vector \u3002\u3002<br \/>\n\t\u4f46\u662f erase \u6bd5\u7adf\u662f\u66b4\u529b\u7684\u3002\u3002\u3002\u6240\u4ee5\u8981\u60f3\u66f4\u8fdb\u4e00\u6b65\u3002\u3002\u3002\u5fc5\u987b\u8bbe\u8ba1\u6570\u636e\u7ed3\u6784\u3002\u3002\u3002<\/p>\n<p><a href=\"http:\/\/www.codechef.com\/viewplaintext\/2479887\">http:\/\/www.codechef.com\/viewplaintext\/2479887<\/a><\/p>\n<p>\t\u4e3a\u4e86\u63a7\u5236\u5e38\u6570\u3002\u3002\u6211\u4eec\u6392\u9664\u4e00\u4e9b\u8f83\u4e3a\u590d\u6742\u7684\u6811\u5f62\u7ed3\u6784\u3002\u3002\u6bd4\u5982\u5404\u79cd\u5e73\u8861\u6811\u3002\u3002<br \/>\n\t\u679c\u7136\u8fd8\u662f\u8981\u6811\u72b6\u6570\u7ec4\u3002\uff01\u3002\u3002\u3002\u8fd9\u6837\u5f53\u6211\u4eec\u5f15\u7528\u5143\u7d20 i \u7684\u65f6\u5019\u3002\u3002\u90a3\u4e48\u5b83\u5f53\u524d\u771f\u5b9e\u7684\u4f4d\u7f6e\u5c31\u662f i &#8211; Sum(i)\u3002\u3002<br \/>\n\t\u3002\u3002\u8fd9\u4e2a\u6570\u636e\u7ed3\u6784\u3002\u3002\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u786e\u5b9a\u5143\u7d20\u7684\u4f4d\u7f6e\uff08Rank\uff09\u3002\u3002\u3002\u4f46\u662f\u65e0\u6cd5\u76f4\u63a5\u544a\u8bc9\u6211\u4eec\u5f53\u524d\u4f4d\u7f6e\u4e3a i \u7684\u5143\u7d20\u662f\u591a\u5c11\uff08Pos\uff09<\/p>\n<p><a href=\"http:\/\/www.codechef.com\/viewsolution\/2520960\">http:\/\/www.codechef.com\/viewsolution\/2520960<\/a><\/p>\n<h4>Stage 3. \u7f13\u5b58<\/h4>\n<p>\t\u4e0a\u8ff0\u7b97\u6cd5\u7684\u74f6\u9888\u5728\u4e8e\u5c31\u5728\u4e8e\u591a\u6b21\u6811\u72b6\u6570\u7ec4\u7684\u67e5\u8be2\u7684\u64cd\u4f5c\u3002\u3002\u3002<br \/>\n\t\u3002\u3002\u6211\u4eec\u53d1\u73b0\u5728\u5904\u7406\u4e0e\u672b\u5c3e\u6570\u5b57\u76f8\u540c\u7684\u65f6\u5019\u3002\u3002\u3002\u5f88\u591a Rank \u7684\u7ed3\u679c\u662f\u53ef\u4ee5\u91cd\u590d\u5229\u7528\u7684\u3002\u3002\u6211\u4eec\u5bf9\u8fd9\u4e2a\u7ed3\u679c\u505a Cache\u3002\u3002<br \/>\n\t\u3002\u3002\u3002\u8fd9\u6837\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u4e5f\u53ef\u4ee5 O(1) \u65f6\u95f4\u5f97\u5230 Pos\u3002\u3002\u3002<\/p>\n<p>\t\u3002\u3002\u9488\u5bf9\u8fd9\u4e2a\u7279\u6027\u3002\u3002\u3002\u4e8e\u662f\u6211\u4eec\u91cd\u65b0\u8bbe\u8ba1\u7b97\u6cd5\u7684\u6846\u67b6\u3002\u3002\u6dfb\u52a0\u4e24\u4e2a\u903b\u8f91\u5c42\u3002\u3002\u3002\u4f7f\u5f97\u6211\u4eec\u4e0d\u662f\u6bcf\u6b21\u90fd\u5fc5\u987b\u8981\u8981\u5220\u9664\u6700\u540e\u4e00\u4e2a\u6570\u5b57\u3002\u3002<\/p>\n<p>\t\u4e2d\u95f4\u4e00\u5c42\u3002\u3002\u3002\u5220\u9664\u7684\u6700\u540e\u4e00\u4e2a\u6570\u5b57\u3002\u3002\u53ef\u4ee5\u662f\u4e0e\u6700\u540e\u4e00\u4e2a\u6570\u5b57\u76f8\u540c\u7684\u6b65\u957f _M1 \u4ee5\u5185\u7684\u4efb\u4f55\u4e00\u4e2a\u6570\u5b57\u3002\u3002<br \/>\n\t\u6700\u5916xxxx\u3002\u3002\u3002xxxxxxxxxxxxxxxxxx\u3002\u3002xxxxxxxxxxxxxxxxxxxx\u4e0d\u540cxxxxxx _D0 \u4ee5\u5185\u7684\u4efb\u4f55\u4e00\u4e2a\u6570\u5b57\u3002<br \/>\n\t\u6700\u5916\u5c42\u7684\u7b56\u7565\u4f7f\u7528\u6b21\u6570\u4e0d\u80fd\u592a\u591a\u3002\u3002\u3002\u8fd8\u5f97\u8bbe\u7f6e\u4e00\u4e2a\u53c2\u6570 _C0\u3002\u3002\u3002<\/p>\n<p><a href=\"http:\/\/www.codechef.com\/viewsolution\/2521453\">http:\/\/www.codechef.com\/viewsolution\/2521453<\/a><\/p>\n<h3>\u3002\u3002\u7528\u5230\u7684\u5176\u4ed6\u4f18\u5316\u3002\u3002<\/h3>\n<ol>\n<li>\u5f00\u59cb\u5c31\u628a\u5b64\u7acb\u5143\u7d20\u5220\u9664\u3002\u3002\u3002\uff08\u8fd9\u4e2a\u4f18\u5316\u5728 vector \u65f6\u671f\u6548\u679c\u6709\u9650\u3002\u3002\u4f46\u662f\u540e\u671f\u6548\u679c\u8d8a\u6765\u8d8a\u660e\u663e\u3002\u3002\u3002\u3002<\/li>\n<li>\u5728\u7b97\u6cd5\u7684\u4efb\u610f\u65f6\u523b\u3002\u3002\u82e5\u51fa\u73b0\u5b64\u7acb\u5143\u7d20\u3002\u7acb\u5373\u5220\u9664\u3002\u3002\u3002\uff08\u3002\u3002\u8fd9\u4e2a\u4f18\u5316\u7684\u4f5c\u7528\u4e5f\u5f88\u660e\u663e\u3002\u3002<\/li>\n<li>. \u3002\u3002\u5f00\u59cb\u548c\u4e2d\u95f4\u65f6\u523b\u3002\u3002\u67d0\u4e2a\u5143\u7d20\u53ea\u5269 2 \u4e2a\u7684\u65f6\u5019\u3002\u3002\u4e5f\u5c1d\u8bd5\u76f4\u63a5\u6e05\u9664\u3002\u3002\u3002\uff08\u3002\u3002\u6548\u679c\u5e76\u4e0d\u660e\u663e\u3002\u3002\u6709\u65f6\u4e0d\u589e\u53cd\u51cf\u3002\u3002\u3002<\/li>\n<\/ol>\n<p>\u6211\u4eec\u770b\u5230\u5176\u5b9e\u5b64\u7acb\u70b9\u5e76\u4e0d\u4e00\u5b9a\u603b\u662f\u76f4\u63a5\u5220\u9664\u66f4\u597d\u3002\u3002\u6709\u7684\u65f6\u5019\u4fdd\u7559\u4e00\u4e9b\u5b64\u7acb\u70b9\u3002\u3002\u53ef\u4ee5\u4ee4\u6211\u4eec\u4e2d\u95f4\u7684\u8fc7\u7a0b\u66f4\u5177\u6709\u673a\u52a8\u6027\u3002\u3002\u3002\u4f46\u662f\u5982\u4f55\u5229\u7528\u8fd9\u79cd\u673a\u52a8\u6027\u3002\u3002\u5374\u6ca1\u6709\u4ec0\u4e48\u597d\u7684\u65b9\u6cd5\u3002\u3002<br \/>\n\u3002\u3002\u5e72\u8106\u5f03\u6389\u7b97\u4e86\u3002\u3002\u3002\u3002<\/p>\n<h3>External link: <\/h3>\n<p><a href=\"http:\/\/www.codechef.com\/AUG13\/\">http:\/\/www.codechef.com\/AUG13\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"","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":[83],"tags":[],"class_list":["post-800","post","type-post","status-publish","format-standard","hentry","category-codechef"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-cU","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/800","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=800"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/800\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=800"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=800"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}