\u6b21\u5c0f\u751f\u6210\u6811<\/a>\u3002
\n\u3002\u3002\u4e0d\u8fc7\u662f\u641e\u51fa s[][] \u4e4b\u540e\u7528 checkMax \u53d6\u4ee3 checkMin\u3002\u3002\u3002\u53e6\u5916\u9898\u76ee\u91cc\u8bf4\u548c 0 \u53f7\u7ed3\u70b9\u76f8\u8fde\u7684\u8fb9\u4fdd\u8bc1\u4e0d\u4f1a\u53d1\u751f\u6545\u969c\u3002\u7279\u5224\u4e00\u4e0b\u3002\u3002\u3002\u3002
\n\uff08\u3002\u3002\u3002\u8fd9\u90fd\u80fd\u5199\u4e0d\u51fa\u5b9e\u5728\u662f\u611f\u4eba\u80ba\u8151\uff01\u3002\u3002\uff09<\/p>\n\r\nconst int N = 1009, M = N * 2;\r\n\r\nDB w[N][N], _s[N][N], s[N][N]; bool inMST[N][N];\r\nint hd[N], suc[M], to[M];\r\nint n, m; DB mst;\r\n\r\nvoid add_edgee(int a, int b){\r\n suc[m] = hd[a], to[m] = b, hd[a] = m++;\r\n suc[m] = hd[b], to[m] = a, hd[b] = m++;\r\n inMST[a][b] = inMST[b][a] = 1;\r\n _s[a][b] = _s[b][a] = OO;\r\n}\r\n\r\nvoid Prim(){\r\n static DB d[N]; static int c[N], pre[N]; RST(c); fill(d, d+n, OO); d[0] = 0; mst = 0, m = 2; DO(n){\r\n int u = 0; while (c[u]) ++u; FOR(i, u+1, n) if (!c[i] && d[i] < d[u]) u = i;\r\n if (u) add_edgee(pre[u], u); mst += d[u], c[u] = 1; REP(v, n) if (!c[v] && d[v] > w[u][v]) d[v] = w[u][v], pre[v] = u;\r\n }\r\n}\r\n\r\n#define v to[i]\r\nint sta[N], top;\r\n\r\nvoid dfs(int r, int u, int p){\r\n REP_G(i, u) if (v != p){\r\n dfs(r, v, u); checkMin(_s[r][u], _s[r][v]);\r\n }\r\n}\r\n\r\nvoid dfs(int u, int p){\r\n int t = top; sta[top++] = u; REP_G(i, u) if (v != p) dfs(v, u); if (!u) return;\r\n FOR(i, t, top) checkMin(s[u][p], _s[sta[i]][p]); s[p][u] = s[u][p];\r\n}\r\n\r\n\r\nint x[N], y[N];\r\n\r\nint main(){\r\n\r\n#ifndef ONLINE_JUDGE\r\n freopen("in.txt", "r", stdin);\r\n \/\/freopen("out2.txt", "w", stdout);\r\n#endif\r\n\r\n Rush{\r\n int k; RD(n, k); RST(hd, inMST); REP(i, n) RD(x[i], y[i]);\r\n REP_2(i, j, n, n) w[i][j] = (i == j ? OO : dist((DB)(x[i]-x[j]), (DB)(y[i]-y[j]))), s[i][j] = OO;\r\n CPY(_s, w); Prim(); REP(i, n) dfs(i, i, i); top = 0, dfs(0, 0);\r\n DB res = 0; int i; FOR_N(i, 1, n) if (!inMST[0][i]) break;\r\n if (i != n) FOR(i, 1, n) FOR(j, i+1, n) if (inMST[i][j]) checkMax(res, s[i][j] - w[i][j]);\r\n OT((res+mst)*k);\r\n }\r\n}\r\n<\/pre>\nExternal link:<\/h3>\n
http:\/\/acm.hust.edu.cn\/vjudge\/problem\/viewSource.action?id=1570178<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Brief description: \u3002\u3002\u7565\uff09\u3002\u3002\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_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","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[],"class_list":["post-836","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-du","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/836","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=836"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/836\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}