{"id":2960,"date":"2023-06-02T04:26:04","date_gmt":"2023-06-01T20:26:04","guid":{"rendered":"https:\/\/www.shuizilong.com\/house\/?p=2960"},"modified":"2023-06-02T04:33:07","modified_gmt":"2023-06-01T20:33:07","slug":"reroot","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/reroot\/","title":{"rendered":"\u6362\u6839 dp"},"content":{"rendered":"<ul>\n<li><a href=\"http:\/\/www.usaco.org\/index.php?page=viewproblem2&#038;cpid=766\">http:\/\/www.usaco.org\/index.php?page=viewproblem2&#038;cpid=766<\/a><\/li>\n<\/ul>\n<pre class=\"brush: cpp; light: false; title: ; toolbar: true; notranslate\" title=\"\">\r\n#include &lt;lastweapon\/number&gt;\r\nusing namespace lastweapon;\r\n\r\nconst int N = int(1e5) + 9;\r\nVI adj&#x5B;N]; Int f&#x5B;N]&#x5B;3]; int c&#x5B;N];\r\nint n, k;\r\n\r\nInt s(int u) {\r\n    return f&#x5B;u]&#x5B;0] + f&#x5B;u]&#x5B;1] + f&#x5B;u]&#x5B;2];\r\n}\r\n\r\nvoid dfs(int u = 0, int p = -1) {\r\n\r\n    REP(i, 3) if (!c&#x5B;u] || (c&#x5B;u]-1) == i) f&#x5B;u]&#x5B;i] = 1;\r\n\r\n    for (auto v: adj&#x5B;u]) if (v != p) {\r\n        dfs(v, u);\r\n        REP(i, 3) f&#x5B;u]&#x5B;i] *= s(v) - f&#x5B;v]&#x5B;i];\r\n    }\r\n}\r\n\r\nint main() {\r\n\r\n#ifndef ONLINE_JUDGE\r\n    freopen(&quot;barnpainting.in&quot;, &quot;r&quot;, stdin);\r\n    freopen(&quot;barnpainting.out&quot;, &quot;w&quot;, stdout);\r\n#endif\r\n\r\n    RD(n, k);\r\n    DO(n-1) {\r\n        int a, b; RD(a, b); --a, --b;\r\n        adj&#x5B;a].PB(b);\r\n        adj&#x5B;b].PB(a);\r\n    }\r\n    DO(k) {\r\n        int a; RD(a); --a;\r\n        RD(c&#x5B;a]);\r\n    }\r\n    dfs();\r\n    cout &lt;&lt; s(0) &lt;&lt; endl;\r\n}\r\n\r\n<\/pre>\n<ul>\n<li><a href=\"https:\/\/www.acmicpc.net\/problem\/14875\">Balkan OI 2017 &#8211; City Attractions<\/a><\/li>\n<\/ul>\n<pre class=\"brush: cpp; light: false; title: ; toolbar: true; notranslate\" title=\"\">\r\n#include &lt;lastweapon\/number&gt;\r\nusing namespace lastweapon;\r\n\r\nconst int N = int(3e5) + 9;\r\nVI adj&#x5B;N];PII f&#x5B;N], g&#x5B;N], h&#x5B;N];int a&#x5B;N], m&#x5B;N], s&#x5B;N];\r\nint n;\r\nLL k;\r\n\r\nvoid dfs1(int u, int p) {\r\n    for(int&amp; v : adj&#x5B;u]) {\r\n        if(v == p) continue;\r\n        dfs1(v, u);\r\n        PII val = max(f&#x5B;v], PII{a&#x5B;v], -v});\r\n        val.first--;\r\n        if (val &gt; f&#x5B;u]) {\r\n            h&#x5B;u] = f&#x5B;u];\r\n            f&#x5B;u] = val;\r\n        } else if (val &gt; h&#x5B;u]) {\r\n            h&#x5B;u] = val;\r\n        }\r\n    }\r\n}\r\n\r\nvoid dfs2(int u, int p) {\r\n    for(int&amp; v : adj&#x5B;u]) {\r\n        if(v == p) continue;\r\n        g&#x5B;v] = max(g&#x5B;u], (f&#x5B;u] == max(PII{f&#x5B;v].first-1, f&#x5B;v].second}, {a&#x5B;v]-1, -v}) ? h&#x5B;u] : f&#x5B;u]), PII{a&#x5B;u], -u});\r\n        g&#x5B;v].first--;\r\n        dfs2(v, u);\r\n    }\r\n}\r\n\r\nint main() {\r\n\r\n#ifndef ONLINE_JUDGE\r\n    freopen(&quot;in.txt&quot;, &quot;r&quot;, stdin);\r\n    \/\/freopen(&quot;out.txt&quot;, &quot;w&quot;, stdout);\r\n#elif\r\n    \/\/freopen(&quot;barnpainting.in&quot;, &quot;r&quot;, stdin);\r\n    \/\/freopen(&quot;barnpainting.out&quot;, &quot;w&quot;, stdout);\r\n#endif\r\n\r\n    RD(n, k);\r\n    REP(i, n) RD(a&#x5B;i]);\r\n    int a, b;\r\n    DO(n-1) {\r\n        RD(a, b);\r\n        a--, b--;\r\n        adj&#x5B;a].PB(b);\r\n        adj&#x5B;b].PB(a);\r\n    }\r\n    REP(i, n) {\r\n        f&#x5B;i] = {-INT_MAX, -INT_MAX};\r\n        g&#x5B;i] = {-INT_MAX, -INT_MAX};\r\n        h&#x5B;i] = {-INT_MAX, -INT_MAX};\r\n    }\r\n    dfs1(0, 0);\r\n    dfs2(0, 0);\r\n\r\n    \/\/REP(i, n) cout &lt;&lt; i &lt;&lt; '\/' &lt;&lt; f&#x5B;i] &lt;&lt; '\/' &lt;&lt; g&#x5B;i] &lt;&lt; endl;\r\n\r\n    int j = 0;\r\n    REP_1(i, n+1) {\r\n        j = -max(f&#x5B;j], g&#x5B;j]).second;\r\n        if(m&#x5B;j]) {\r\n            int ans;\r\n            if(k &lt;= m&#x5B;j]) {\r\n                ans = k;\r\n            } else {\r\n                ans = ((k-m&#x5B;j]) % (i-m&#x5B;j])) + m&#x5B;j];\r\n            }\r\n            cout &lt;&lt; s&#x5B;ans]+1 &lt;&lt; endl;\r\n            break;\r\n        }\r\n        m&#x5B;j] = i;\r\n        s&#x5B;i] = j;\r\n    }\r\n}\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>http:\/\/www.usaco.org\/index.php?page=viewproblem2&#038;cpid=766 #include &lt;lastweapon\/number&gt; using namespace lastweapon; const int N = int(1e5) + 9; VI adj&#x5B;N]; Int f&#x5B;N]&#x5B;3]; int c&#x5B;N]; int n, k; Int s(int u) { return f&#x5B;u]&#x5B;0] + f&#x5B;u]&#x5B;1] + f&#x5B;u]&#x5B;2]; } void dfs(int u = 0, int p = -1) { REP(i, 3) if (!c&#x5B;u] || (c&#x5B;u]-1) == i) f&#x5B;u]&#x5B;i] = 1; for [&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":[1],"tags":[],"class_list":["post-2960","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/s2tdP7-reroot","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/2960","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=2960"}],"version-history":[{"count":5,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/2960\/revisions"}],"predecessor-version":[{"id":2965,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/2960\/revisions\/2965"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=2960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=2960"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=2960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}