Submission #1251314

#TimeUsernameProblemLanguageResultExecution timeMemory
1251314IsamBosses (BOI16_bosses)C++17
100 / 100
444 ms752 KiB
#include <bits/stdc++.h> using namespace std; #define int long long #define pii pair<int, int> #define F first #define S second constexpr int sz = 5005; constexpr int inf = 1e18 + 7; int n, cnt, cost, ans = inf; vector<int> g[sz]; bitset<sz> vis; void bfs(int root){ queue<pii> q; vis[root] = (q.push({root, 1}), 1); while(!q.empty()){ pii cur = q.front(); cost += (q.pop(), ++cnt, cur.S); for(int &u : g[cur.F]) if(!vis[u]) vis[u] = (q.push({u, cur.S + 1}), 1); } } signed main() { ios::sync_with_stdio(false); cin.tie(nullptr); cin >> n; for(int i = 1, k; i <= n; ++i){ cin >> k; for(int j = 1, u; j <= k; ++j){ cin >> u; g[u].emplace_back(i); } } for(int i = 1; i <= n; ++i){ vis.reset(); cost = cnt = 0ll; bfs(i); if(cnt == n) ans = min(ans, cost); } cout << ans << '\n'; return 0; }
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