{"id":304,"date":"2010-07-16T18:35:50","date_gmt":"2010-07-16T10:35:50","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=304"},"modified":"2013-05-17T00:57:50","modified_gmt":"2013-05-16T16:57:50","slug":"hdu-3887-counting-offspring","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/hdu-3887-counting-offspring\/","title":{"rendered":"HDU 3887. Counting Offspring"},"content":{"rendered":"

Brief description: <\/h3>\n

\u7ed9\u5b9a\u4e00\u68f5\u6811\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u7ed3\u70b9\uff0c\u8be2\u95ee\u5176\u5b50\u6811\u4e2d\u7ed3\u70b9\u6807\u53f7\u5c0f\u4e8e\u5176\u7684\u6570\u76ee\u3002
\n<\/p>\n

Analysis: <\/h3>\n

… \u7565\uff09\u3002\u3002\uff08\u3002\u79bb\u7ebf\u540e\u53c2\u7167 Apple Tree<\/a>\u3002\u3002)\u3002\u3002<\/p>\n

http:\/\/acm.hust.edu.cn\/vjudge\/problem\/viewSource.action?id=1169143<\/a><\/p>\n

\r\nconst int N = 100009, M = 2 * N;\r\n\r\nint L[N], R[N], cnt;\r\n\/\/ Vertex .. .\r\nint hd[N], nxt[M], a[M], b[M];\r\n\/\/ Adjacent List .. .\r\nint C[N];\r\n\/\/ Interval Tree\r\nint n, root;\r\n\r\n\r\nvoid Modify(int x, int d){\r\n    while (x <= n) C[x] += d, x += low_bit(x);\r\n}\r\n\r\nint Sum(int x){\r\n    int res = 0; while (x) res += C[x], x ^= low_bit(x);\r\n    return res;\r\n}\r\n\r\nint Sum(int l, int r){\r\n    return Sum(r) - Sum(l-1);\r\n}\r\n\r\n#define v b[i]\r\n\r\ninline void dfs(int u = root){\r\n    L[u] = ++cnt;\r\n    for (int i=hd[u];i;i=nxt[i]) if (!L[v]){\r\n        dfs(v);\r\n    }\r\n    R[u] = cnt;\r\n}\r\n\r\nint main(){\r\n\r\n#ifndef ONLINE_JUDGE\r\n    freopen("in.txt", "r", stdin);\r\n#endif\r\n\r\n    while (scanf("%d %d", &n, &root) != EOF && n){\r\n\r\n        RST(hd, C, L), cnt = 0; FOR_C(i, 2, n << 1){\r\n            RD(a[i], b[i]), a[i|1] = b[i], b[i|1] = a[i];\r\n            nxt[i] = hd[a[i]], hd[a[i]] = i; ++i;\r\n            nxt[i] = hd[a[i]], hd[a[i]] = i;\r\n        }\r\n\r\n        dfs(); REP_1(i, n){\r\n            OT(Sum(L[i], R[i])); if (i == n) puts(""); else printf(" ");\r\n            Modify(L[i], 1);\r\n        }\r\n    }\r\n}\r\n<\/pre>\n
External link: <\/h3>\n
http:\/\/acm.hdu.edu.cn\/showproblem.php?pid=3887<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Brief description: \u7ed9\u5b9a\u4e00\u68f5\u6811\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u7ed3\u70b9\uff0c\u8be2\u95ee\u5176\u5b50\u6811\u4e2d\u7ed3\u70b9\u6807\u53f7\u5c0f\u4e8e\u5176\u7684\u6570\u76ee\u3002<\/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":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[47],"tags":[],"class_list":["post-304","post","type-post","status-publish","format-standard","hentry","category-hdu"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-4U","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/304","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=304"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/304\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}