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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. using namespace std;
  4. bool bfs(ll i,vector<int> v[],bool mark[],bool color[]){
  5. 	color[i]=0;
  6. 	mark[i]=1;
  7. 	ll j;
  8. 	queue<int> q;
  9. 	q.push(i);
  10. 	while(!q.empty()){
  11. 		j=q.front();
  12. 		q.pop();
  13. 		for(ll k=0;k<v[j].size();k++){
  14. 			if(!mark[v[j][k]]){
  15. 				mark[v[j][k]]=1;
  16. 				if(color[j])
  17. 					color[v[j][k]]=0;
  18. 				else
  19. 					color[v[j][k]]=1;
  20. 				q.push(v[j][k]);
  21. 			}
  22. 			else{
  23. 				if(color[j]==color[v[j][k]])
  24. 					return 1;
  25. 			}
  26. 		}
  27. 	}
  28. 	return 0;
  29. }
  30. int main()
  31. {
  32. 	int t,t1=1;
  33. 	cin>>t;
  34. 	while(t1<=t){
  35. 		ll n,e,a,b;
  36. 		cin>>n>>e;
  37. 		vector<int> v[n+1];
  38. 		bool mark[n+1];
  39. 		bool color[n+1];
  40. 		memset(mark,0,n+1);
  41. 		for(ll i=0;i<e;i++){
  42. 		cin>>a>>b;
  43. 		v[a].push_back(b);	
  44. 		}
  45. 		cout<<"Scenario #"<<t1<<":"<<endl;
  46. 		for(ll i=1;i<=n;i++){
  47. 			if(!mark[i]){
  48. 				if(bfs(i,v,mark,color)){
  49. 					cout<<"Suspicious bugs found!"<<endl;
  50. 					goto here;
  51. 				}
  52. 			}
  53. 		}
  54. 		cout<<"No suspicious bugs found!"<<endl;
  55. 		here:t1++;
  56.  
  57. 	}
  58.  
  59. }
Runtime error #stdin #stdout 0s 4568KB
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https://ideone.com/X2F5x8
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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