{"id":931,"date":"2014-08-08T05:12:08","date_gmt":"2014-08-07T21:12:08","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=931"},"modified":"2016-08-24T22:57:23","modified_gmt":"2016-08-24T14:57:23","slug":"codechef-april-challenge-2012-substrings-on-a-tree","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/codechef-april-challenge-2012-substrings-on-a-tree\/","title":{"rendered":"Codechef April Challenge 2012. Substrings on a Tree"},"content":{"rendered":"<h3>Brief description:<\/h3>\n<p>\u7ed9\u5b9a\u4e00\u4e2a tire\uff0c\u6c42\u5176\u4e2d\u4e92\u4e0d\u76f8\u540c\u7684\u5b50\u4e32\u7684\u4e2a\u6570\u3002\u4e4b\u540e\u6bcf\u6b21\u8be2\u95ee\uff0c\u6c42\u5c06 <code>a-z<\/code> \u7684\u4f18\u5148\u7ea7\u91cd\u62cd\u540e\u5b57\u5178\u5e8f\u7b2c <code>kth<\/code> \u5927\u7684\u5b50\u4e32\u3002<\/p>\n<h3>Analysis:<\/h3>\n<p>\u5e7f\u4e49\u540e\u7f00\u81ea\u52a8\u673a\u3002\u6ce8\u610f\u8fd9\u4e2a\u662f 12 \u5e74\u7684\u9898\u3002\u3002\u3002<\/p>\n<p>\u4fee\u6539 Ext() \u8fc7\u7a0b\uff0ctail \u6307\u9488\u73b0\u5728\u9700\u8981\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u3002\u3002\u3002<\/p>\n<pre class=\"brush: cpp; light: false; title: ; toolbar: true; notranslate\" title=\"\">\r\n    int Ext(int c, int tail){\r\n        int u = tail, uu = new_node(); len&#x5B;uu] = len&#x5B;u] + 1;\r\n        while (u &amp;&amp; !v) v = uu, u = p;\r\n        if (!u &amp;&amp; !v) v = uu, pp = 0;\r\n        else{\r\n            if (len&#x5B;v] == len&#x5B;u] + 1) pp = v;\r\n            else{\r\n                int _v = v, vv = new_node(_v); len&#x5B;vv] = len&#x5B;u] + 1;\r\n                par&#x5B;_v] = pp = vv; while (v == _v) v = vv, u = p;\r\n            }\r\n        }\r\n        return uu;\r\n    }\r\n<\/pre>\n<p>\u4e4b\u540e\u3002\u3002<\/p>\n<pre class=\"brush: cpp; light: false; title: ; toolbar: true; notranslate\" title=\"\">\r\n    void Init(){\r\n\r\n        RD(n, q); RS(s+1); n = strlen(s+1); REP_1(i, n) s&#x5B;i] -= 'a';\r\n\r\n        \/\/RST(hd);\r\n        FOR_C(i, 2, n&lt;&lt;1){\r\n            RD(aa, bb);\r\n            suc&#x5B;i] = hd&#x5B;aa], hd&#x5B;aa] = i++;\r\n            suc&#x5B;i] = hd&#x5B;aa], hd&#x5B;aa] = i;\r\n        }\r\n\r\n        tot = 0; queue&lt;int&gt; Q; Q.push(1);\r\n        GtoM&#x5B;1] = Ext(s&#x5B;1], new_node());\r\n\r\n        while(SZ(Q)){\r\n            int u = Q.front(); Q.pop();\r\n            REP_G(i, u) if (!GtoM&#x5B;v]){\r\n                GtoM&#x5B;v] = Ext(s&#x5B;v], GtoM&#x5B;u]);\r\n                Q.push(v);\r\n            }\r\n        }\r\n    }\r\n<\/pre>\n<p>Select \u7684\u8fc7\u7a0b\u53c2\u7167 <a href=\"https:\/\/www.shuizilong.com\/house\/archives\/spoj-7258-lexicographical-substring-search\/\">SPOJ SUBLEX<\/a> \u5373\u53ef\u3002<\/p>\n<p><a href=\"http:\/\/www.codechef.com\/viewsolution\/4511141\">http:\/\/www.codechef.com\/viewsolution\/4511141<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Brief description: \u7ed9\u5b9a\u4e00\u4e2a tire\uff0c\u6c42\u5176\u4e2d\u4e92\u4e0d\u76f8\u540c\u7684\u5b50\u4e32\u7684\u4e2a\u6570\u3002\u4e4b\u540e\u6bcf\u6b21\u8be2\u95ee\uff0c\u6c42\u5c06 a-z \u7684\u4f18\u5148\u7ea7\u91cd\u62cd\u540e\u5b57\u5178\u5e8f\u7b2c kth \u5927\u7684\u5b50\u4e32\u3002 Analysis: \u5e7f\u4e49\u540e\u7f00\u81ea\u52a8\u673a\u3002\u6ce8\u610f\u8fd9\u4e2a\u662f 12 \u5e74\u7684\u9898\u3002\u3002\u3002 \u4fee\u6539 Ext() \u8fc7\u7a0b\uff0ctail \u6307\u9488\u73b0\u5728\u9700\u8981\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u3002\u3002\u3002 int Ext(int c, int tail){ int u = tail, uu = new_node(); len&#x5B;uu] = len&#x5B;u] + 1; while (u &amp;&amp; !v) v = uu, u = p; if (!u &amp;&amp; !v) v = uu, pp = 0; else{ if [&hellip;]<\/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":[83],"tags":[123],"class_list":["post-931","post","type-post","status-publish","format-standard","hentry","category-codechef","tag-123"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-f1","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/931","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=931"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/931\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}