{"id":191,"date":"2025-02-10T17:04:54","date_gmt":"2025-02-10T09:04:54","guid":{"rendered":"https:\/\/blog.seekrealthing.net\/blog\/?p=191"},"modified":"2025-02-10T17:04:57","modified_gmt":"2025-02-10T09:04:57","slug":"g-privatization-of-roads-in-treeland-%e8%a7%a3%e6%9e%90%e6%80%9d%e7%b6%ad%e3%80%81%e5%9c%96%e8%ab%96%e3%80%81%e5%bb%ba%e6%a7%8b%e3%80%81dfs","status":"publish","type":"post","link":"https:\/\/blog.seekrealthing.net\/blog\/?p=191","title":{"rendered":"G. 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class=\"language-cpp\">const int _n = 2e5 + 10;\nint t, n, k, id[_n], T = 0, color[_n];\nbool canBeNotGood[_n];\nstruct E {\n  int v, num;\n};\nvector&lt;E&gt; G[_n];\nvoid dfs(int v) {\n  id[v] = ++T;\n  int colorToDraw = 1;\n  int faColor = 0;\n  rep(i, 0, SZ(G[v])) {\n    if (id[G[v][i].v]) {\n      faColor = color[G[v][i].num];\n    }\n  }\n  rep(i, 0, SZ(G[v])) {\n    if (!id[G[v][i].v]) {\n      if (canBeNotGood[v]) {\n        color[G[v][i].num] = 1;\n      } else {\n        if (colorToDraw == faColor) colorToDraw++;\n        color[G[v][i].num] = colorToDraw;\n        colorToDraw++;\n      }\n      dfs(G[v][i].v);\n    }\n  }\n}\nmain(void) {\n  ios_base::sync_with_stdio(0);\n  cin.tie(0);\n  cout.tie(0);\n  cin &gt;&gt; n &gt;&gt; k;\n  rep(i, 0, n - 1) {\n    int x, y;\n    cin &gt;&gt; x &gt;&gt; y;\n    x--, y--;\n    G[x].pb({y, i});\n    G[y].pb({x, i});\n  }\n  vector&lt;int&gt; cities;\n  rep(i, 0, n) cities.pb(i);\n  sort(all(cities), [](int&amp; lhs, int&amp; rhs) {\n    return G[lhs].size() &gt; G[rhs].size();\n  });\n  rep(i, 0, k) {\n    canBeNotGood[cities[i]] = 1;\n  }\n  dfs(0);\n\n  int ansR = 0;\n  rep(i, 0, n - 1) {\n    ansR = max(ansR, color[i]);\n  }\n  cout &lt;&lt; ansR &lt;&lt; '\\n';\n  rep(i, 0, n - 1) {\n    cout &lt;&lt; color[i] &lt;&lt; ' ';\n  }\n  cout &lt;&lt; '\\n';\n  return 0;\n}\n<\/code><\/pre>\n<p>\u6a19\u982d\u3001\u6a21\u677f\u8acb\u9edeSubmission\u770b\n<a href=\"https:\/\/codeforces.com\/contest\/1141\/submission\/305415381\">Submission<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_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},"version":2}},"categories":[3],"tags":[10,7,9,31,47,8],"class_list":["post-191","post","type-post","status-publish","format-standard","hentry","category-ojcode","tag-codeforce","tag-dfs","tag-ojcode","tag-31","tag-47","tag-8"],"jetpack_publicize_connections":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>G. 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