Submission #1015563

#TimeUsernameProblemLanguageResultExecution timeMemory
1015563THXuanCapital City (JOI20_capital_city)C++14
0 / 100
3050 ms29008 KiB
// subtask 1 && subtask 2 #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <set> #include <map> #define INF 1e9 using namespace std; typedef long long ll; int v[200005], p[200005]; vector<int>adj[200005], c[200005]; void dfs(int s, int e) { for (auto u : adj[s]) { if (u == e) continue; p[u] = s; dfs(u, s); } } void solve() { int n, k; cin >> n >> k; for (int i = 1; i <= n - 1; i++) { int u, v; cin >> u >> v; adj[u].push_back(v); adj[v].push_back(u); } for (int i = 1; i <= n; i++) { cin >> v[i]; c[v[i]].push_back(i); } dfs(1, 0); int ans = INF; for (int i = 1; i <= k; i++) { queue<int>q; for (auto u : c[i]) {q.push(u); } vector<bool>visited(k + 1, false); visited[i] = true; int anss = 0; while (q.size()) { int u = q.front(); q.pop(); if (p[u] != 0 && v[p[u]] != v[u] && !visited[v[p[u]]]) { visited[v[p[u]]] = true; ++anss; for (auto x : c[v[p[u]]])q.push(x); } } ans = min(ans, anss); } cout << ans << "\n"; } int main() { ios_base::sync_with_stdio(0); cin.tie(0); int t = 1;//cin>>t; while (t--) solve(); return 0; }
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