{"id":1137,"date":"2015-06-30T02:12:30","date_gmt":"2015-06-29T18:12:30","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=1137"},"modified":"2015-06-30T02:12:30","modified_gmt":"2015-06-29T18:12:30","slug":"leetcode-5-longest-palindromic-substring","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/leetcode-5-longest-palindromic-substring\/","title":{"rendered":"LeetCode 5. Longest Palindromic Substring"},"content":{"rendered":"<p><!--more--><\/p>\n<p>Manacher<\/p>\n<pre class=\"brush: cpp; light: false; title: ; toolbar: true; notranslate\" title=\"\">\r\n#define REP(i, n) for (int i=0;i&lt;n;++i)\r\n#define FOR(i, a, b) for (int i=a;i&lt;b;++i)\r\nconst int N = int(2e3) + 9;\r\nchar s&#x5B;N]; int r&#x5B;N]; int n;\r\n\r\nclass Solution {\r\npublic:\r\n    string longestPalindrome(string ss) {\r\n        int nn = ss.size(); \r\n        \r\n        n = 2*nn+2; s&#x5B;0] = '$'; REP(i, nn) s&#x5B;i*2+1]='.',s&#x5B;i*2+2]=ss&#x5B;i];s&#x5B;n-1]='.'; s&#x5B;n] = 0;\r\n\r\n        int mx=0,mi=0;FOR(i,1,n){\r\n            for (r&#x5B;i]=mx&gt;i?min(r&#x5B;2*mi-i],mx-i):1;s&#x5B;i+r&#x5B;i]]==s&#x5B;i-r&#x5B;i]];++r&#x5B;i]);\r\n            if (i+r&#x5B;i]&gt;mx)mx=i+r&#x5B;i],mi=i;\r\n        }\r\n        mx=0;FOR(i,1,n)if(r&#x5B;i]&gt;mx)mx=r&#x5B;i],mi=i;--mx; string z;\r\n        for(int i=mi-mx+1;i&lt;mi+mx;i+=2) z += s&#x5B;i];\r\n        return z;\r\n    }\r\n};\r\n<\/pre>\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":[142],"tags":[],"class_list":["post-1137","post","type-post","status-publish","format-standard","hentry","category-leetcode"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-il","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1137","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=1137"}],"version-history":[{"count":1,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1137\/revisions"}],"predecessor-version":[{"id":1138,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1137\/revisions\/1138"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=1137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=1137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=1137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}