{"id":736,"date":"2013-06-01T03:43:19","date_gmt":"2013-05-31T19:43:19","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=736"},"modified":"2013-06-01T21:51:27","modified_gmt":"2013-06-01T13:51:27","slug":"hcpc-2013-spring-onsite-contest-%e8%a7%a3%e9%a2%98%e6%8a%a5%e5%91%8a","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/hcpc-2013-spring-onsite-contest-%e8%a7%a3%e9%a2%98%e6%8a%a5%e5%91%8a\/","title":{"rendered":"HCPC 2013 Spring Onsite Contest \u89e3\u9898\u62a5\u544a"},"content":{"rendered":"<p><!--more--><\/p>\n<h2>Problem C. A Sequence Problem<\/h2>\n<h3>Brief description: <\/h3>\n<p>&#8230; \u7565\uff09<\/p>\n<h3>Analysis: <\/h3>\n<blockquote><p>\u5176\u5b9e\u8fd9\u9898\u662f\u6211\u4eec\u901a\u5316\u533a\u57df\u9080\u8bf7\u8d5b\u7684C\u9898\u63d0\u53d6\u51fa\u7684\u4e00\u4e2a\u5b50\u95ee\u9898\uff0c\u8fd9\u6b21\u628a\u4ed6\u5f53\u505a\u4e00\u4e2a\u6bd4\u8f83\u7b80\u5355\u7684\u9898\u76ee\u6765\u51fa\u3002<\/p>\n<p>\u5206\u6790\uff1a<br \/>\na[i]>=k;<br \/>\na[i+1]>=k-1;<br \/>\n\u2026<br \/>\na[i+k-2]>=2;<br \/>\na[i+k-1]>=1;<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u4ece\u540e\u5f80\u524d\u5012\u63a8\u3002\u5047\u8bbe\u4ee5\u5f53\u524d\u4f4d\u7f6e\u4e3a\u8d77\u70b9(\u4e0d\u59a8\u5047\u8bbe\u4e3a\u4f4d\u7f6ei)\u6700\u5927\u7b26\u5408\u9898\u610f\u7684\u8fde\u7eed\u5b50\u4e32\u957f\u5ea6\u4e3alen\uff0c<br \/>\n\u5373\u8868\u793aa[i]>=len,a[i+1]>=len-1,&#8230;a[i+len-1]>=1  (\u5047\u8bbe)\u521a\u5f00\u59cblen = 0\u3002<\/p>\n<p>1.\u5982\u679c\u5f53\u524d\u9879a[i]>len\uff0c\u6839\u636e\u5047\u8bbe\uff0c\u53ef\u4ee5\u628aa[i]\u76f4\u63a5\u52a0\u5230\u8fde\u7eed\u5b50\u4e32\u7684\u7b2c\u4e00\u4f4d\uff0clen++<br \/>\n2.\u5982\u679c\u5f53\u524d\u9879a[i]<=len\uff0c\u6839\u636e\u5047\u8bbe\uff0c\u540e\u9762\u7684\u6570\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u662f\u4e0d\u7528\u8003\u8651\u4e86\u7684\uff0c\u8fd9\u65f6\u53ea\u9700\u8981\u628aa[i]\u653e\u8fdb\n  \u5b50\u4e32\u7684\u7b2c\u4e00\u4f4d\uff0c\u56e0\u4e3a\u9700\u8981\u6ee1\u8db3a[i]>=a[i]\uff0c(a[i+1]>=a[i]-1&#8230;a[i+a[i-1]-1]>=1)\u8fd9\u663e\u7136\u6ee1\u8db3\uff0c<br \/>\n  \u6240\u4ee5\u628aa[i]\u653e\u8fdb\u6765\u7684\u65f6\u5019\uff0clen = a[i]\u3002<\/p>\n<p>\u6bcf\u4e00\u6b65\u66f4\u65b0\u7b54\u6848\u3002<\/p>\n<p>\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\uff08by yejinru\uff09 <\/p><\/blockquote>\n<p><a href=\"https:\/\/gist.github.com\/lychees\/5690411\">\u53c2\u8003\u7a0b\u5e8f<\/a><\/p>\n<h2>Problem G. GSM<\/h2>\n<h3>Brief description: <\/h3>\n<p>&#8230; \u7ed9\u5b9a\u4e00\u4e2a V \u56fe\uff0c\u95ee\u4e00\u6761\u7ebf\u6bb5\u7ecf\u8fc7\u4e86\u591a\u5c11\u6676\u80de\uff08cells\uff09\u3002<br \/>\nTags: \u51e0\u4f55\uff0cVoronoi \u56fe\uff0c\u4e8c\u5206<\/p>\n<h3>Analysis: <\/h3>\n<p>&#8230; \u7ed9\u5b9a\u4e00\u4e2a\u70b9\u96c6\uff0c<a href=\"http:\/\/en.wikipedia.org\/wiki\/Voronoi_diagram\">Voronoi \u56fe<\/a>\u662f\u6307\u5c06\u5e73\u9762\u5212\u5206\u5230\u8ddd\u79bb\u5176\u6700\u8fd1\u7684\u70b9\u7684\u51e0\u4f55\u7ed3\u6784\u3002\u5b8c\u6574\u7684\u6784\u9020\u51fa Voronoi \u56fe\u662f\u56f0\u96be\u7684\u3002\u3002\u3002\u5355\u5c31\u8fd9\u4e2a\u9898\u76ee\u6765\u8bf4\u3002\u3002\u66f4\u4e3a\u79d1\u5b66\u7684\u65b9\u6cd5\u662f\u5bf9\u6240\u67e5\u8be2\u7684\u7ebf\u6bb5\u6267\u884c\u4e8c\u5206\u3002\u3002\u56e0\u4e3a\u5982\u679c\u4e00\u4e2a\u7ebf\u6bb5\u7684\u4e24\u7aef\u540c\u5c5e\u4e8e\u4e00\u4e2a\u6676\u80de\u3002\u3002\u90a3\u4e48\u8be5\u7ebf\u6bb5\u7684\u4efb\u4f55\u4e00\u4e2a\u90e8\u5206\u4e00\u5b9a\u90fd\u5c5e\u4e8e\u4e00\u4e2a\u6676\u80de\u3002\u3002\u3002<br \/>\n\u3002\u7528\u8fd9\u4e2a\u6765\u4f5c\u4e3a\u4e00\u4e2a\u7ec8\u6b62\u6761\u4ef6\u3002\u3002\u6bcf\u6b21\u66b4\u529b\u68c0\u67e5\u4e24\u4e2a\u7aef\u70b9\u5206\u5c5e\u54ea\u4e2a\u96c6\u5408\u5373\u53ef\u3002\u3002\u590d\u6742\u5ea6 O(n*\u6bcf\u6b21\u4e8c\u5206)\u3002<\/p>\n<p>\u7c7b\u4f3c\u7684\u641e\u6cd5\u5728\u8ba1\u7b97\u51e0\u4f55\u4e2d\u5f88\u5e38\u89c1\u3002\u3002\u3002<br \/>\n\u53c2\u89c1\u3002<a href=\"http:\/\/www.nocow.cn\/index.php\/USACO_Training\">Usaco Section 3.4 Closed Fences (fence4)<\/a><br \/>\n<a href=\"https:\/\/gist.github.com\/anonymous\/5686462\">\u53c2\u8003\u7a0b\u5e8f<\/a><\/p>\n<h2>Problem H. To The Moon 2<\/h2>\n<h3>Brief description: <\/h3>\n<p>\u3002\u3002\u7ef4\u62a4\u4e00\u4e2a\u5e8f\u5217\u3002\u652f\u6301\u533a\u95f4\u52a0\u51cf\u3002\u533a\u95f4\u6c42\u548c\u3002\u3002\u4ee5\u53ca\u8fd4\u56de\u5230\u4e4b\u524d\u7684\u4e00\u4e2a\u64cd\u4f5c\u4e4b\u524d\u3002<br \/>\nTags: \u7ebf\u6bb5\u6811\u3001\u6811\u72b6\u6570\u7ec4\u3001\u53ef\u6301\u4e45\u5316\u6570\u636e\u7ed3\u6784\u3001\u79bb\u7ebf\u3001\u4e8b\u4ef6\u6811\u3001DFS()<\/p>\n<h3>Analysis: <\/h3>\n<p>\u3002\u3002\u9996\u5148\u3002\u3002\u533a\u95f4\u52a0\u51cf\u3002\u533a\u95f4\u6c42\u548c\u8fd9\u4e2a\u7ebf\u6bb5\u6811\u7684\u57fa\u672c\u64cd\u4f5c\u3002\u3002\uff08\u4e5f\u53ef\u4ee5\u7528\u6811\u72b6\u6570\u7ec4\u5de7\u5999\u5b9e\u73b0\uff09\u3002\u3002<br \/>\n\u3002\u3002\u4e0d\u662f\u8fd9\u9898\u7684\u91cd\u70b9\u3002\u3002\u4e0d\u4f1a\u7684\u53ef\u4ee5\u7ffb\u770b\u3002\u3002<a href=\"http:\/\/www.notonlysuccess.com\/index.php\/segment-tree-complete\">\u3010\u5b8c\u5168\u7248\u3011\u7ebf\u6bb5\u6811 by hh\u3002\u3002<\/a>\u3002<\/p>\n<p>\u3002\u3002\u4e3b\u5e2d\u6811\uff08\u53ef\u6301\u4e45\u5316\u7ebf\u6bb5\u6811\uff09\u56e0\u4e3a\u53ef\u4ee5\u67e5\u8be2\u5230\u4efb\u4f55\u4e00\u4e2a\u5386\u53f2\u72b6\u6001\u4e2d\u53bb\u3002\u3002\u6240\u4ee5\u7528\u5230\u8fd9\u9898\u5f53\u7136\u968f\u4fbf\u505a\u3002\u3002<br \/>\n\u3002\u3002\u5f53\u7136\u79bb\u7ebf\u7684\u8bdd\u6709\u66f4\u4e3a\u65b9\u4fbf\u7684\u505a\u6cd5\u3002\u3002\u5c06\u64cd\u4f5c\u770b\u6210\u4e8b\u4ef6\u3002\u3002\u90a3\u4e48\u4e8b\u4ef6\u4e4b\u95f4\u4f1a\u5448\u73b0\u51fa\u4e00\u68f5\u6811\u5f62\u5173\u7cfb\u3002\u3002<br \/>\n\u3002\u3002\u4ece\u6839\u5f00\u59cb\u3002DFS() \u4e00\u904d\u8fd9\u9897 \u201c\u4e8b\u4ef6\u6811\u201d \u3002\u8fdb\u5165\u5b50\u8282\u70b9\u65f6\u6267\u884c\u64cd\u4f5c\u3002\u3002\u8fd4\u56de\u65f6\u64a4\u9500\u8fd9\u4e2a\u64cd\u4f5c\u3002\u3002<br \/>\n\u3002\u3002\u3002\u5c31\u53ef\u4ee5\u5f97\u5230\u6240\u6709\u8be2\u95ee\u7684\u7b54\u6848\u3002\u3002\u3002<\/p>\n<h3>External link: <\/h3>\n<p><a href=\"https:\/\/www.shuizilong.com\/house\/archives\/spoj-11470-to-the-moon\/\">https:\/\/www.shuizilong.com\/house\/archives\/spoj-11470-to-the-moon\/<\/a><\/p>\n<h2>Problem I. ????&#8230;<\/h2>\n<h3>Brief description: <\/h3>\n<p>&#8230; \u7ecf\u5178\u7684 MAWC \uff08minimum-average-weight-circle\uff09\u95ee\u9898<\/p>\n<h3>Analysis: <\/h3>\n<p>\u65b9\u6cd5\u4e00\uff1a<br \/>\n\u8bbe dp[k][i][j] \u8868\u793a\u5f53\u524d\u957f\u5ea6\u4e3a k, i \u5230 j \u7684\u6700\u77ed\u8def\u3002\u3002\u4e8e\u662f\u53ef\u4ee5 O(n4) \u52a8\u6001\u89c4\u5212\uff08\u500d\u589e\u7b2c\u4e00\u7ef4\u53ef\u4ee5\u4f18\u5316\u5230 O(n3logn)\u3002<br \/>\n\u7c7b\u4f3c\u7684\u65b9\u6cd5\u8fd8\u53ef\u4ee5\u505a MAWP \uff08\u5747\u503c\u6700\u77ed\u8def\u5f84\uff09<br \/>\n\uff08minimum-average-weight-path\uff09<br \/>\n\u3002\u3002\u3002\u3002\u4f46\u662f\u6211\u9a8c\u9898\u7684\u65f6\u5019\u8fd9\u4e2a\u65b9\u6cd5<a href=\"http:\/\/acm.hust.edu.cn\/vjudge\/problem\/viewSource.action?id=1201984 \">\u4e00\u76f4 WA\u3002\u3002<\/a>\u3002\u3002\/w\\\u3002\u3002\u3002<\/p>\n<p>\u65b9\u6cd5\u4e8c\uff1a<br \/>\n\u3002\u3002\u4e8c\u5206\u7b54\u6848\u5224\u5b9a\u3002\u5047\u8bbe\u5b58\u5728\u5e73\u5747\u503c\u5c0f\u4e8e x \u7684\u73af\uff0c\u90a3\u4e48\u5c06\u6574\u526f\u56fe\u4e2d\u7684\u8fb9\u6743\u5168\u90e8\u51cf x\u3002<br \/>\n\u3002\u3002\u4e00\u5b9a\u5b58\u5728\u4e00\u4e2a\u8d1f\u6743\u73af\u3002&#8230; \u4e8c\u5206\u7b54\u6848\u5224\u5b9a\u3002\u3002<br \/>\n\u3002\u3002\u5bf9\u6bcf\u6761\u8fb9 -x\u3002\u3002spfa \u5224\u65ad\u662f\u5426\u5b58\u5728\u8d1f\u6743\u73af\u3002<br \/>\n\u3002\u3002\u5982\u679c\u6709\u4e00\u4e2a\u70b9\u8fdb\u5165\u961f\u5217 n \u6b21\u3002\u3002\u3002\u5219\u8868\u660e\u5b58\u5728\u8d1f\u6743\u73af\u3002<\/p>\n<p><a href=\"http:\/\/acm.hust.edu.cn\/vjudge\/problem\/viewSource.action?id=1201710\">\u53c2\u8003\u4ee3\u7801<\/a><\/p>\n<h3>External link: <\/h3>\n<p><a href=\"http:\/\/acm.hust.edu.cn\/vjudge\/problem\/viewProblem.action?id=34650\">http:\/\/acm.hust.edu.cn\/vjudge\/problem\/viewProblem.action?id=34650<\/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":[1],"tags":[],"class_list":["post-736","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-bS","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/736","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=736"}],"version-history":[{"count":1,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/736\/revisions"}],"predecessor-version":[{"id":737,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/736\/revisions\/737"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=736"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=736"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=736"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}