\u96ea\u96e8\u5fc3\u98de@USCT<\/a> \u51fa\u7684\u9898\u3002\u3002\u7136\u540e\u6211\u53c2\u4e0e\u7684\u9a8c\u9898\u3002\u3002\u7136\u540e\u8c8c\u4f3c\u6302\u4e0a\u53bb\u7684\u6570\u636e\u6709\u8bef\u3002\u3002\u3002\u3002\uff09<\/p>\n\r\nconst int N = 100109, M = 2 * N;\r\n\r\nint L[N], R[N], sz[N], hd[N], h[N], cnt;\r\n\/\/ Vertex\r\nint nxt[M], a[M], b[M];\r\n\/\/ Adjacent list\r\nint C[4*N], rev[4*N], root = 1;\r\n\/\/ Interval Tree\r\nint n, m, n2, _;\r\n\r\n#define lx (x<<1)\r\n#define rx (lx|1)\r\n#define m ((l+r)>>1)\r\n#define lc lx, l, m, a, b\r\n#define rc rx, m+1, r, a, b\r\n#define len (r - l + 1)\r\n#define Release if (rev[x]) C[x] = len - C[x], rev[lx] ^= true, rev[rx] ^= true, rev[x] = false\r\n#define Update C[x] = (rev[lx] ? (m - l + 1) - C[lx] : C[lx]) + (rev[rx] ? (r - m) - C[rx] : C[rx])\r\n\r\nint Modify(int x = root, int l = 1, int r = n, int a = 1, int b = n){\r\n if (a <= l && r <= b){\r\n rev[x] ^= true;\r\n }\r\n else {\r\n Release; if (a <= m) Modify(lc); if (m < b) Modify(rc);\r\n Update;\r\n }\r\n}\r\n\r\nint Query(int x = root, int l = 1, int r = n, int a = 1, int b = n){\r\n if (a <= l && r <= b){\r\n return rev[x] ? len - C[x] : C[x];\r\n }\r\n else{\r\n Release; return (a <= m ? Query(lc) : 0) + (m < b ? Query(rc) : 0);\r\n }\r\n}\r\n\r\n#define v b[i]\r\n\r\ninline void dfs(int u = 0){\r\n L[u] = ++cnt; sz[u] = 1; for (int i=hd[u];i;i=nxt[i]) if (!L[v]){\r\n dfs(h[i>>1]=v), sz[u] += sz[v];\r\n }\r\n R[u] = cnt;\r\n}\r\n\r\n#undef m\r\n\r\nint main(){\r\n\r\n#ifndef ONLINE_JUDGE\r\n \/\/freopen("in.txt", "r", stdin);\r\n \/\/freopen("swust.in", "r", stdin);\r\n \/\/freopen("out.txt", "w", stdout);\r\n#endif\r\n\r\n Rush{\r\n\r\n RD(n, m); FOR_C(i, 2, n << 1){\r\n RD(_, a[i], b[i]), --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(); char cmd[9]; int x; DO(m){\r\n RS(cmd); x = h[RD()];\r\n if (cmd[0] == 'Q'){\r\n if (sz[x] == n\/2){\r\n puts("Oh, my dear SWUST");\r\n }\r\n else if (sz[x] > n\/2){\r\n OT(Query(root, 1, n, L[x], R[x]));\r\n }\r\n else {\r\n OT(Query() - Query(root, 1, n, L[x], R[x]));\r\n }\r\n }\r\n else {\r\n if (sz[x] == n\/2) Modify();\r\n else {\r\n if (sz[x] < n\/2) Modify();\r\n Modify(root, 1, n, L[x], R[x]);\r\n }\r\n }\r\n }\r\n\r\n RST(hd, nxt, a, b, sz);\r\n RST(L, R, C, rev), cnt = 0;\r\n }\r\n}\r\n<\/pre>\nExternal link: <\/h3>\n
http:\/\/acm.swust.edu.cn\/oj\/problem\/857\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Brief description: \u7ed9\u5b9a\u4e00\u9897\u6811\uff0c\u6bcf\u4e2a\u7ed3\u70b9\u9ed1\u767d\u4e24\u79cd\u989c\u8272\uff0c\u52a8\u6001\u7ef4\u62a4\u4ee5\u4e0b\u8be2\u95ee\uff1a \u3002\u3002\u6bcf\u6b21\u64cd\u4f5c\u4e00\u6761\u8fb9\uff0c\u5c06\u7ed3\u70b9\u6570\u8f83\u591a\u7684\u4e00\u4fa7\u7684\u989c\u8272\u53d6\u53cd\u3002\uff08\u5982\u76f8\u7b49\u5219\u5168\u90e8\u53d6\u53cd\u3002\u3002 \u3002\u3002\u6bcf\u6b21\u8be2\u95ee\u4e00\u6761\u8fb9\uff0c\u56de\u7b54\u7ed3\u70b9\u6570\u8f83\u591a\u4e00\u4fa7\u7684\u767d\u8272\u6570\u3002\uff08\u5982\u76f8\u7b49\u5219\u8f93\u51fa \u201cOh, my dear SWUST\u201d \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_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":[16],"tags":[],"class_list":["post-287","post","type-post","status-publish","format-standard","hentry","category-online-judge"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-4D","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/287","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=287"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/287\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=287"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=287"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=287"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}