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  1. #include <iostream>
  2. #include<bits/stdc++.h>
  3.  
  4. using namespace std;
  5. int main() {
  6. 	int n,e;
  7. 	cin>>n>>e;
  8. 	vector<int> g[n+1];
  9.  
  10. 	for(int i=1;i<=e;i++){
  11. 		int u;
  12. 		int v;
  13. 		cin>>u>>v;
  14.  
  15. 		g[u].push_back(v);
  16. 		g[v].push_back(u);
  17. 	}
  18.  
  19. 	int s;
  20. 	cin>>s;
  21. 	queue<pair<int,int>> q;
  22. 	q.push({s,0});
  23. 	vector<int> level(n+1,-1);
  24. 	vector<int> visited(n+1);
  25. 	visited[s]=1;
  26.  
  27.  
  28.  
  29.  
  30. 	while(!q.empty()){
  31.        int a = q.front().first;
  32. 	   int lvl = q.front().second;
  33. 	   level[a] = lvl;
  34. 	   q.pop();
  35.  
  36.  
  37. 	   for(auto it : g[a]){
  38.            if(!visited[it]){
  39. 			q.push({it,lvl+1});
  40. 			visited[it]=1;
  41.  
  42. 		   }
  43. 	   }
  44. 	}
  45.  
  46. 	for(int i=1;i<=n;i++){
  47. 		if(level[i]==-1){
  48. 			cout<<"NO"<<" ";
  49. 		}
  50. 		else{
  51. 			cout<<"YES"<<" ";
  52.  
  53. 		}
  54.  
  55. 	}
  56. }
Success #stdin #stdout 0s 5320KB
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stdin
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5 4
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stdout
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YES YES YES YES YES
https://ideone.com/VncqmL
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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