Submission #520690

#	Time	Username	Problem	Language	Result	Execution time	Memory
520690		Alex_tz307	Bosses (BOI16_bosses)	C++17	100 / 100	729 ms	588 KiB

bosses

#include <bits/stdc++.h>
#define INF 0x3f3f3f3f

using namespace std;

void minSelf(int &x, int y) {
  if (y < x) {
    x = y;
  }
}

void testCase() {
  int n;
  cin >> n;
  vector<vector<int>> g(n + 1);
  for (int v = 1; v <= n; ++v) {
    int k;
    cin >> k;
    for (int i = 0; i < k; ++i) {
      int u;
      cin >> u;
      g[u].emplace_back(v);
    }
  }
  int ans = INF;
  for (int root = 1; root <= n; ++root) {
    vector<int> level(n + 1);
    level[root] = 1;
    queue<int> q;
    q.emplace(root);
    while (!q.empty()) {
      int u = q.front();
      q.pop();
      for (int v : g[u]) {
        if (!level[v]) {
          level[v] = level[u] + 1;
          q.emplace(v);
        }
      }
    }
    if (*min_element(level.begin() + 1, level.end()) != 0) {
      minSelf(ans, accumulate(level.begin() + 1, level.end(), 0));
    }
  }
  cout << ans << '\n';
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  int tests = 1;
  for (int tc = 0; tc < tests; ++tc) {
    testCase();
  }
  return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 33 / 33