https:\/\/www.facebook.com\/hackercup\/problems.php?pid=182208915220500&round=222291111185610<\/a> <\/p>\n .. \u7ed9\u5b9a n \u4e2a\u7ed3\u70b9\u3002\u3002\u8ba9\u4f60\u6309\u7167\u7ed9\u5b9a\u7684\u987a\u5e8f\u5408\u5e76 n-1 \u6b21\u53d8\u6210\u4e00\u9897\u6811\u3002\u3002\u7531\u4f60\u51b3\u5b9a\u6bcf\u6b21\u5408\u5e76\u65f6\u3002\u8c01\u4f5c\u4e3a\u7236\u4eb2\u3002\u3002\u3002 … \u7528\u5e76\u67e5\u96c6\u6a21\u62df\u5373\u53ef\u3002\u3002\u6bcf\u6b21\u5408\u5e76\u7684\u65f6\u5019\u7ef4\u62a4\u6240\u6709\u7684\u5408\u6cd5\u65b9\u6848\u5373\u53ef\u3002\u3002 .\u65e0\u5411\u56fe\u3002\u3002n \u4e2a\u7ed3\u70b9 m \u6761\u8fb9\u3002\u3002\u524d k \u4e2a\u7ed3\u70b9\u662f\u5173\u952e\u7ed3\u70b9\u3002\u3002 …\u3002\u3002\u5c45\u7136\u8fd8\u662f\u5e76\u67e5\u96c6\u3002\u3002\uff08\uff1f\u3002\u3002 External link: https:\/\/www.facebook.com\/hackercup\/problems.php?pid=182208915220500&round=222291111185610 http:\/\/codeforces.com\/gym\/100159<\/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":[109],"tags":[],"class_list":["post-675","post","type-post","status-publish","format-standard","hentry","category-facebook-hacker-cup"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-aT","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/675","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=675"}],"version-history":[{"count":1,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/675\/revisions"}],"predecessor-version":[{"id":676,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/675\/revisions\/676"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=675"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=675"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nhttp:\/\/codeforces.com\/gym\/100159<\/a><\/p>\nProblem A. Monopoly<\/h2>\n
Brief description: <\/h3>\n
\n\u3002\u3002\u4f7f\u5f97\u6bcf\u4e2a\u7ed3\u70b9\u7684\u5b69\u5b50\u4e0d\u8d85\u8fc7 M \u4e2a\u3002\u3002\u3002\u5e76\u4e14\u9ad8\u5ea6\u6700\u5c0f\u3002\u3002<\/p>\nAnalysis: <\/h3>\n
\n\uff08\u3002\u3002\u5373\u5f00\u4e00\u4e2a vector\r\n\/\/}\/* .................................................................................................................................. *\/\r\n\r\nconst int N = 32768;\r\n\r\nnamespace dsu{\r\n int p[N]; VII c[N];\r\n int n, m;\r\n\r\n int Find(int x){\r\n return x == p[x] ? x : p[x] = Find(p[x]);\r\n }\r\n\r\n void Union(int x, int y){\r\n x = Find(x), y = Find(y); VII cc;\r\n int h = c[y][0].fi+1; ECH(it, c[x]) if (it->se<m) cc.PB(MP(max(it->fi, h), it->se+1));\r\n h = c[x][0].fi+1; ECH(it, c[y]) if (it->se<m) cc.PB(MP(max(it->fi, h), it->se+1));\r\n SRT(cc), p[y] = x; CLR(c[x]); ECH(it, cc) if (c[x].empty() || it->se < c[x].back().se) c[x].PB(*it);\r\n }\r\n\r\n void gao(){\r\n DO(n-1) Union(RD(), RD());\r\n }\r\n\r\n void init(){\r\n RD(n, m); REP_1(i, n) p[i] = i, CLR(c[i]), c[i].PB(MP(1, 0));\r\n }\r\n} using namespace dsu;\r\n\r\n\r\nint main(){\r\n\r\n#ifndef ONLINE_JUDGE\r\n freopen("in.txt", "r", stdin);\r\n \/\/freopen("out.txt", "w", stdout);\r\n#endif\r\n\r\n Rush{\r\n init(), gao();\r\n OT(c[Find(1)].front().fi);\r\n }\r\n}\r\n<\/pre>\nProblem B. Road Removal<\/h2>\n
Brief description: <\/h3>\n
\n\u3002\u3002\u8981\u6c42\u5220\u9664\u6700\u5c11\u6570\u636e\u7684\u8fb9\u4f7f\u5f97\u73af\u4e0d\u4f1a involve \u5173\u952e\u7ed3\u70b9\u3002\u3002\u3002<\/p>\nAnalysis: <\/h3>\n
\n\u5148\u628a\u6240\u6709\u5b89\u5168\u8fb9\u5168\u90e8\u7528\u4e0a\u3002\u3002\uff08\u4e0d\u4e0e\u5173\u952e\u70b9\u76f8\u5173\u7684\u8fb9\u3002\u3002
\n\u3002\u3002\u3002\u518d\u770b\u975e\u5b89\u5168\u8fb9\u80fd\u4e0d\u80fd\u5408\u5e76\u5373\u53ef\u3002\u3002\u3002<\/p>\n\r\n\/\/}\/* .................................................................................................................................. *\/\r\n\r\nconst int N = int(1e4) + 9, M = int(5e4) + 9;\r\n\r\nnamespace dsu{\r\n int p[N], r[N], n, m, k, res;\r\n int a[M], b[M];\r\n\r\n void Make(int x){\r\n r[x] = 0, p[x] = x;\r\n }\r\n\r\n int Find(int x){\r\n return x == p[x] ? x : p[x] = Find(p[x]);\r\n }\r\n\r\n bool Union(int x, int y){\r\n x = Find(x), y = Find(y);\r\n if (x == y) return false;\r\n if (r[x] < r[y]) p[x] = y;\r\n else {\r\n if (r[x] == r[y]) ++r[x];\r\n p[y] = x;\r\n }\r\n return true;\r\n }\r\n\r\n void gao(){\r\n REP(i, m){\r\n RD(a[i], b[i]); if (a[i] >= k && b[i] >= k) Union(a[i], b[i]);\r\n else ++res;\r\n }\r\n\r\n REP(i, m) res -= Union(a[i], b[i]);\r\n }\r\n\r\n void init(){\r\n RD(n, m, k); REP(i, n) Make(i);\r\n res = 0;\r\n }\r\n} using namespace dsu;\r\n\r\n\r\nint main(){\r\n\r\n#ifndef ONLINE_JUDGE\r\n freopen("in.txt", "r", stdin);\r\n \/\/freopen("out.txt", "w", stdout);\r\n#endif\r\n\r\n Rush{\r\n init(); gao();\r\n OT(res);\r\n }\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"