oj.uz

Submission #673552

# Submission time Handle Problem Language Result Execution time Memory
673552 2022-12-21T04:15:52 Z quocnguyen1012 Newspapers (CEOI21_newspapers) C++14
0 / 100
 1 ms 212 KB 
#include "bits/stdc++.h"

using namespace std;

int main() {
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  
  int N, M; cin >> N >> M;
  vector<vector<int>> adj(N);
  for (int i = 0; i < M; ++i) {
    int u, v; cin >> u >> v;
    --u; --v;
    adj[u].emplace_back(v);
    adj[v].emplace_back(u);
  }

  bool exist_cycle = false;
  vector<bool> visited(N, false);
  auto dfs = [&](auto&dfs, int u, int p) -> void {
    visited[u] = true;
    for (int v : adj[u]) {
      if (v == p) continue;
      if (visited[v]) exist_cycle = true;
      else dfs(dfs, v, u);
    }
  };

  dfs(dfs, 0, -1);
  if (exist_cycle)
    return cout << "NO", 0;

  
  cout << "YES";
}

Subtask #1
0.0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -

Subtask #2
0.0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -

Subtask #3
0.0 / 80.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -