Submission #745518

#	Time	Username	Problem	Language	Result	Execution time	Memory
745518		Sarpa	Newspapers (CEOI21_newspapers)	C++14	4 / 100	4 ms	5076 KiB

newspapers

// Be nam KHODA
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define all(x) (x).begin(), (x).end()
#define F first
#define S second

const int N = 2e5 + 10, mod = 1e9 + 7, inf = INT_MAX;

int n, m;
vector<int> adj[N];
bool mark[N], cy;

void dfs(int u, int p =-1){
  mark[u] = true;
  for(auto & v : adj[u]){
    if(mark[v] and v != p)
      cy = true;
    if(!mark[v])
      dfs(v, u);
    }
}

int main(){
    cin.tie(0), ios::sync_with_stdio(0);
    cin >> n >> m;
    for(int i = 0; i < m; i++){
      int u, v;
      cin >> u >> v;
      u--, --v;
      adj[u].push_back(v);
      adj[v].push_back(u);
    }
    for(int i = 0; i < n; i++)
      if(!mark[i])
        dfs(i);
    if(cy)
      cout << "NO" << endl;
    else
      cout << "YES\n1\n1" << endl;
    return 0;   
}

• Subtask 1: 0 / 12
• Subtask 2: 4 / 8
• Subtask 3: 0 / 80