\u57fa\u672c\u5c31\u662f Tree Distances II\uff0c
\n\u8f6c\u79fb\u51fd\u6570\u7a0d\u5fae\u8c03\u6574\u4e0b\u3002<\/p>\n
\r\n#include <lastweapon\/io>\r\n\r\nusing namespace lastweapon;\r\n\r\nconst int N = int(2e5) + 9;\r\n\r\nint n, m, h[N], c[N], l[N]; LL f[N], g[N];\r\nVVI v;\r\n\r\nvoid dfs1(int r, int p = -1) {\r\n for(int& a : v[r]) if (a != p) {\r\n dfs1(a, r);\r\n h[r] += h[a];\r\n f[r] += f[a] + h[a]*l[a];\r\n }\r\n if(!c[r]) h[r]++;\r\n}\r\n\r\nvoid dfs2(int r, int p = -1) {\r\n for(int& a : v[r]) if (a != p) {\r\n g[a] = (f[r] - (f[a] + h[a]*l[a])) + g[r] + (m - h[a])*3;\r\n dfs2(a, r);\r\n }\r\n}\r\n\r\nint main() {\r\n\r\n\r\nfreopen("dirtraverse.in", "r", stdin);\r\nfreopen("dirtraverse.out", "w", stdout);\r\n\r\n\r\n RD(n);\r\n v.resize(n);\r\n int a;\r\n string s;\r\n REP(i, n) {\r\n cin >> s;\r\n l[i] = s.size();\r\n RD(c[i]);\r\n if(c[i]) l[i]++;\r\n else m++;\r\n REP(j, c[i]) {\r\n RD(a), a--;\r\n v[i].PB(a);\r\n v[a].PB(i);\r\n }\r\n }\r\n dfs1(0);\r\n dfs2(0);\r\n LL ans = INFF;\r\n REP(i, n) ans = min(ans, f[i]+g[i]);\r\n cout << ans << endl;\r\n}\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"\u57fa\u672c\u5c31\u662f Tree Distances II\uff0c \u8f6c\u79fb\u51fd\u6570\u7a0d\u5fae\u8c03\u6574\u4e0b\u3002 #include <lastweapon\/io> using namespace lastweapon; const int N = int(2e5) + 9; int n, m, h[N], c[N], l[N]; LL f[N], g[N]; VVI v; void dfs1(int r, int p = -1) { for(int& a : v[r]) if (a != p) { dfs1(a, r); h[r] += h[a]; f[r] += f[a] + h[a]*l[a]; […]<\/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-2978","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-M2","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/2978","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=2978"}],"version-history":[{"count":2,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/2978\/revisions"}],"predecessor-version":[{"id":2980,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/2978\/revisions\/2980"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=2978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=2978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=2978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}