{"id":166,"date":"2012-04-06T00:44:37","date_gmt":"2012-04-05T16:44:37","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=166"},"modified":"2012-04-06T13:57:20","modified_gmt":"2012-04-06T05:57:20","slug":"sgu-507-treediff","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/sgu-507-treediff\/","title":{"rendered":"SGU 507. Treediff"},"content":{"rendered":"

Brief description: <\/h3>\n

\u7ed9\u5b9a\u4e00\u68f5 n \u4e2a\u7ed3\u70b9\u7684\u6811\uff0c\u53f6\u8282\u70b9\u6709\u4e00\u4e2a\u6743\u503c\uff0c\u95ee\u4ee5\u6bcf\u4e2a\u5185\u7ed3\u70b9\u4e3a\u6839\u7684\u5b50\u6811\uff0c\u6240\u6709\u53f6\u8282\u70b9\u4e4b\u95f4\u6743\u503c\u5dee\u6700\u5c0f\u7684\u503c\u3002
\n( n <= 50000 )\n<\/p>\n

Analysis: <\/h3>\n

… . \u542f\u53d1\u5f0f\u5408\u5e76\u3002\u3002<\/p>\n

\r\nconst int N = 50009;\r\n\r\nSI S[N]; queue<int> Q;\r\nint p[N], c[N], h[N], res[N], n, m;\r\n\r\n\r\nint main(){\r\n\r\n    \/\/freopen("in.txt", "r", stdin);\r\n\r\n    RD(n, m); fill(res, res + n, 0x7fffffff); FOR(i, 1, n) ++c[--_RD(p[i])];\r\n\r\n    REP(i, n) h[i] = i; FOR(i, n - m, n) S[i].insert(RD()), Q.push(i);\r\n\r\n    while (!Q.empty()){\r\n        int u = Q.front(); Q.pop();\r\n\r\n#define uu h[u]\r\n#define v p[u]\r\n#define vv h[v]\r\n\r\n        if (SZ(S[vv]) < SZ(S[uu])) swap(uu, vv);\r\n\r\n        if (S[vv].empty()){\r\n            res[v] = res[u];\r\n            vv = uu;\r\n        }\r\n        else {\r\n\r\n            checkMin(res[v], res[u]);\r\n\r\n            \/*\r\n            SI::iterator jt, kt; pair<SI::iterator, bool> tmp; ECH(it, S[uu]){\r\n                tmp = S[vv].insert(*it); if (!tmp.second) {res[v] = 0; break;}\r\n                else {\r\n                    jt = tmp.first;\r\n                    if (jt != S[vv].begin()) kt = jt, --kt, checkMin(res[v], *jt - *kt);\r\n                    kt = jt; ++kt; if (kt != S[vv].end()) checkMin(res[v], *kt - *jt);\r\n                }\r\n            }\r\n            *\/\r\n\r\n            \r\n            SI::iterator jt; ECH(it, S[uu]){\r\n                SI::iterator jt = S[vv].lower_bound(*it);\r\n                if(jt != S[vv].end()) res[v] = min(res[v], *jt - *it);\r\n                if(jt != S[vv].begin()) res[v] = min(res[v], *it - *--jt);                \r\n                if (!res[v]) break;\r\n            }\r\n\r\n            if (res[v]) ECH(it, S[uu]) S[vv].insert(*it);\r\n\r\n        }\r\n\r\n        if (!--c[v] && v) Q.push(v);\r\n    }\r\n\r\n    REP(i, n - m) cout << res[i] << " ";\r\n    cout << endl;\r\n}\r\n<\/pre>\n
External link: <\/h3>\n
http:\/\/acm.sgu.ru\/problem.php?contest=0&problem=507<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Brief description: \u7ed9\u5b9a\u4e00\u68f5 n \u4e2a\u7ed3\u70b9\u7684\u6811\uff0c\u53f6\u8282\u70b9\u6709\u4e00\u4e2a\u6743\u503c\uff0c\u95ee\u4ee5\u6bcf\u4e2a\u5185\u7ed3\u70b9\u4e3a\u6839\u7684\u5b50\u6811\uff0c\u6240\u6709\u53f6\u8282\u70b9\u4e4b\u95f4\u6743\u503c\u5dee\u6700\u5c0f\u7684\u503c\u3002 ( n<\/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":[61],"tags":[],"class_list":["post-166","post","type-post","status-publish","format-standard","hentry","category-sgu"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-2G","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/166","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=166"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/166\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=166"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}