{"id":488,"date":"2012-09-27T05:28:43","date_gmt":"2012-09-26T21:28:43","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=488"},"modified":"2012-10-01T11:54:38","modified_gmt":"2012-10-01T03:54:38","slug":"codeforces-round-140","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/codeforces-round-140\/","title":{"rendered":"Codeforces Round #140"},"content":{"rendered":"<p><!--more--><\/p>\n<h3>Brief description: <\/h3>\n<p>A. Flying Saucer Segments<br \/>\n.. 3 \u9636\u6c49\u8bfa\u5854\uff08\u53ea\u80fd\u76f8\u90bb\u67f1\u5b50\u95f4\u79fb\u52a8\u3002\u3002<br \/>\n\u6709\u516c\u5f0f\u79fb\u52a8\u6b65\u6570 f(n) = 3^n &#8211; 1..<\/p>\n<p>Python:<br \/>\n<a href=\"http:\/\/codeforces.com\/contest\/226\/submission\/2239524\">http:\/\/codeforces.com\/contest\/226\/submission\/2239524<\/a><br \/>\nRuby:<br \/>\n<a href=\"http:\/\/codeforces.com\/contest\/226\/submission\/2269427\">http:\/\/codeforces.com\/contest\/226\/submission\/2269427<\/a><\/p>\n<p>B. Naughty Stone Piles<br \/>\n\u3002\u5806\u77f3\u5b50\u95ee\u9898\u3002\u3002\uff08\u6392\u5e8f\uff0c\u5206\u7ec4\u3002\u3002<br \/>\n<a href=\"http:\/\/codeforces.com\/contest\/226\/submission\/2270030\">http:\/\/codeforces.com\/contest\/226\/submission\/2270030<\/a><\/p>\n<p>C. Anniversary<br \/>\n\u6c42 [l, r] \u4e4b\u95f4\u7684\u4e00\u4e2a\u5927\u5c0f\u4e3a k \u7684\u5b50\u96c6\uff0c\u662f\u7684\u5b83\u4eec\u7684 gcd \u6700\u5927\u3002<\/p>\n<p>D. The table<br \/>\n\u8d2a\u5fc3\u3002\u3002\uff08\u53cd\u590d\u5bfb\u627e\u5c40\u90e8\u6536\u76ca\u6700\u5927\u64cd\u4f5c\u76f4\u81f3\u4e0d\u80fd\u3002\u3002<br \/>\n<a href=\"http:\/\/codeforces.com\/contest\/226\/submission\/2239190\">http:\/\/codeforces.com\/contest\/226\/submission\/2239190<\/a><\/p>\n<p>E. Noble Knight&#8217;s Path .. .<br \/>\n\u3002\u3002\u7ed9\u5b9a\u4e00\u68f5\u6811\uff0c\u52a8\u6001\u7ef4\u62a4\u4ee5\u4e0b\u64cd\u4f5c\u3002<\/p>\n<ul>\n<li>1 u: \u6c61\u67d3\u4e00\u4e2a\u9876\u70b9\uff0c\uff08\u6bcf\u4e2a\u9876\u70b9\u81f3\u591a\u88ab\u6c61\u67d3\u4e00\u6b21\uff0c\u6ca1\u6709\u9006\u64cd\u4f5c\u3002\u3002<\/li>\n<li>2 u v kth y \u5bfb\u627e u\u3001v \u4e4b\u95f4\u8def\u5f84\u4e0a\u7b2c kth \u4e2a\u6ca1\u6709\u88ab\u6c61\u67d3\u9876\u70b9\u3002\uff08\u53ea\u8003\u8651 y + 1 \u65f6\u523b\u4e4b\u540e\u7684\u6c61\u67d3\u64cd\u4f5c\u3002\u4e14 u\uff0cv \u4e0d\u7eb3\u5165\u8003\u91cf\u3002\u3002\u3002<\/li>\n<\/ul>\n<h3>Analysis: <\/h3>\n<p>C. Anniversary<br \/>\n\u8bbe\u6700\u5927\u516c\u7ea6\u6570\u4e3a d\uff0c\u96c6\u5408\u4e2d\u6700\u5c0f\u6570\u4e3a ad\uff0c\u6700\u5927\u6570\u4e3a bd\u3002<br \/>\n\u5219\u6709 ad >= l, bd <= r\u3002\n\n\u3002\u3002\u65b9\u6cd51. \u679a\u4e3e d\uff0c\u53cd\u590d\u8fed\u4ee3\u3002\uff08\u6bcf\u6b21\u7528\u4e0a\u4e00\u8f6e\u7684 d \u7b97\u51fa\u65b0\u7684 d \u5e76\u66f4\u65b0\u7b54\u6848\u3002\n<a href=\"http:\/\/codeforces.com\/contest\/226\/submission\/2268689\">http:\/\/codeforces.com\/contest\/226\/submission\/2268689<\/a><br \/>\n\u3002\u3002\u65b9\u6cd52. \u89c2\u5bdf\u7b54\u6848\u8981\u4e0d d \u5f88\u5c0f\u3002\u3002\u8981\u4e0d a \u5f88\u5c0f\u3002\u3002\uff08\u66b4\u529b\u679a\u4e3e\u4e24\u79cd\u60c5\u51b5\u5373\u53ef\u3002\u3002<br \/>\n<a href=\"http:\/\/codeforces.com\/contest\/226\/submission\/2268680\">http:\/\/codeforces.com\/contest\/226\/submission\/2268680<\/a><\/p>\n<p>E. Noble Knight&#8217;s Path .. .<br \/>\n\u3002\u3002\u6b64\u9898\u4e3a\u53ef\u6301\u4e45\u5316\u7248\u672c\u7684 QTREE 2 ..\u7528\u4e3b\u5e2d\u6811\u7ef4\u62a4\u4efb\u610f\u4e24\u4e2a\u65f6\u523b\u4e4b\u95f4\u8def\u5f84\u4e0a\u6709\u591a\u5c11\u4e2a\u70b9\u88ab\u6c61\u67d3\u8fc7\uff0c\u518d\u6309\u7167 QTREE 2 \u7684\u65b9\u6cd5\u500d\u589e\u7956\u5148\u5373\u53ef\u3002<\/p>\n<p><a href=\"http:\/\/codeforces.com\/contest\/226\/submission\/2265544\">http:\/\/codeforces.com\/contest\/226\/submission\/2265544<\/a><\/p>\n<h3>External link: <\/h3>\n<p><a href=\"http:\/\/codeforces.com\/contest\/226\/room\/4\">http:\/\/codeforces.com\/contest\/226\/room\/4<\/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":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[18],"tags":[],"class_list":["post-488","post","type-post","status-publish","format-standard","hentry","category-codeforces"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-7S","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/488","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=488"}],"version-history":[{"count":1,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/488\/revisions"}],"predecessor-version":[{"id":489,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/488\/revisions\/489"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=488"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=488"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=488"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}