제출 #994144

#제출 시각아이디문제언어결과실행 시간메모리
994144SharkyBosses (BOI16_bosses)C++17
100 / 100
1079 ms1100 KiB
#include <bits/stdc++.h> using namespace std; const int N = 5001; vector<int> adj[N], tree[N]; int sz[N], ans = 0, opt = 1e9, cnt = 0; bool vis[N]; void dfs(int u) { sz[u] = 1; cnt++; for (auto& v : tree[u]) { dfs(v); sz[u] += sz[v]; } ans += sz[u]; } int main() { ios::sync_with_stdio(0); cin.tie(0); int n; cin >> n; for (int i = 1, j, x; i <= n; i++) { cin >> j; while (j--) { cin >> x; adj[x].push_back(i); } } for (int rt = 1; rt <= n; rt++) { ans = cnt = 0; for (int j = 1; j <= n; j++) { tree[j].clear(); vis[j] = 0, sz[j] = 0; } queue<int> q; q.push(rt); vis[rt] = 1; while (!q.empty()) { int u = q.front(); q.pop(); for (int v : adj[u]) if (!vis[v]) { q.push(v); tree[u].push_back(v); vis[v] = 1; } } dfs(rt); if (cnt == n) opt = min(opt, ans); } cout << opt << '\n'; } // 1 // 2 3 // 456 78 // 8 // 4 3 // 1 1 1 1 1 // find sigma(sz[u])
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