fork download 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ii pair<int, int>
  4. #define ll pair<long long, long long>
  5. const int inf = 1e9;
  6. const int mod = 1e9 +7;
  7. const int maxn = 1e5 + 1;
  8. int t,m,n,a[maxn],u,v;
  9. vector<int> g[maxn];
  10. bool kiemtra(int n)
  11.  {
  12.  	for (int i=1; i<=n; i++) a[i]=-1;
  13.  	for (int i=1; i<=n; i++)
  14.  		if (a[i]==-1)
  15.  		 {
  16.  		 	queue<int> q;
  17.  		 	q.push(i);
  18.  		 	a[i]=0;
  19.  		 	while (!q.empty())
  20.  		 	 {
  21.  		 	 	int u=q.front(); q.pop();
  22.  		 	 	for (int v:g[u])
  23.  		 	 	 	if (a[v]==-1) a[v]=1-a[u],q.push(v);
  24.  		 	 			else if (a[v]==a[u]) return false;
  25. 			 }
  26. 		 }
  27. 	return true;
  28.  }
  29. int main(){
  30. 	ios_base::sync_with_stdio(false);
  31. 	cin.tie(0); cout.tie(0);
  32. 	cin>>t;
  33. 	while (t--)
  34. 	 {
  35. 	 	cin>>n>>m;
  36. 	 	for (int i=1; i<=n; i++) g[i].clear();
  37. 	 	for (int i=1; i<=m; i++)
  38. 	 	 {
  39. 	 	 	cin>>u>>v;
  40. 	 	 	g[u].push_back(v);
  41. 	 	 	g[v].push_back(u);
  42. 		 }
  43. 		if (kiemtra(n)) cout<<"NO";
  44. 			else cout<<"YES";
  45. 		cout<<"\n";
  46. 	 }
  47. }
  48.  
Success #stdin #stdout 0.01s 5928KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/dpeWnJ
language:
C++14 (gcc 8.3)
created:
11 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!