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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(){
  5. 	int n,e;
  6. 	cin>>n>>e;
  7. 	vector<int>g[n+1];
  8. 	for(int i=0;i<e;i++){
  9. 		int x,y;
  10. 		cin>>x>>y;
  11. 		g[x].push_back(y);
  12. 		g[y].push_back(x);
  13. 	}
  14. 	vector<int>v(n+1,0);
  15. 	int s;
  16. 	cin>>s;
  17. 	queue<int>q;
  18. 	q.push(s);
  19. 	v[s]=1;
  20. 	while(!q.empty()){
  21. 		for(auto it:g[q.front()]){
  22. 			if(v[it]==0){
  23. 				v[it]=1;
  24. 				q.push(it);
  25. 			}
  26. 		}
  27. 		q.pop();
  28. 	}
  29. 	for(int i=1;i<=n;i++){
  30. 		if(v[i]==1){
  31. 			cout<<i<<" can be visited\n";
  32. 		}
  33. 		else cout<<i<<" can't be visited\n";
  34. 	}
  35. 	return 0;
  36. }
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin 
6 4
1 2
1 3
1 4
5 6
1
stdout 
1 can be visited
2 can be visited
3 can be visited
4 can be visited
5 can't be visited
6 can't be visited
https://ideone.com/ojDshy
language:
C++14 (gcc 8.3)
created:
8 days ago
visibility:
public

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