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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin >> n;
  7.  
  8. 	int m;
  9. 	cin >> m;
  10.  
  11. 	vector<int> Graph[n+5];
  12.  
  13. 	for(int i=0; i<m; i++) {
  14. 		int x, y;
  15.  
  16. 		cin >> x >> y;
  17.  
  18. 		Graph[x].push_back(y);
  19. 		Graph[y].push_back(x);
  20. 	}
  21.  
  22. 	int src = 1;
  23. 	int vis[n+5] = {0};
  24. 	int level[n+5] = {0};
  25.  
  26. 	queue<int> q;
  27.  
  28. 	q.push(src);
  29. 	vis[src] = 1;
  30. 	level[src] = 0;
  31.  
  32. 	while(!q.empty()) {
  33. 		int removed = q.front();
  34.  
  35. 		cout << "Removed: " << removed << " Level: " << level[removed] << endl;
  36.  
  37. 		q.pop();
  38.  
  39. 		for(auto u : Graph[removed]) {
  40. 			if(vis[u] == 0) {
  41. 				q.push(u);
  42. 				vis[u] = 1;
  43. 				level[u] = level[removed] + 1;
  44. 			}
  45. 		}
  46. 	}
  47.  
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
5 4
0 1
1 2
2 3
2 4
stdout 
Removed: 1 Level: 0
Removed: 0 Level: 1
Removed: 2 Level: 1
Removed: 3 Level: 2
Removed: 4 Level: 2
https://ideone.com/N1ktNI
language:
C++ (gcc 8.3)
created:
12 hours ago
visibility:
public

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