fork download
copy 
  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<int> q;
  22. 	q.push(s);
  23. 	vector<int> level(n+1,-1);
  24. 	level[s]=0;
  25.  
  26. 	vector<int> visited(n+1);
  27. 	visited[s]=1;
  28. 	vector<int> ways(n+1,0);
  29. 	ways[s]=1;
  30.  
  31.  
  32.  
  33.  
  34.  
  35. 	while(!q.empty()){
  36.        int a = q.front();
  37.  
  38.  
  39. 	   q.pop();
  40.  
  41.  
  42. 	   for(auto it : g[a]){
  43.            if(!visited[it]){
  44. 			q.push(it);
  45. 			visited[it]=1;
  46. 			level[it] = level[a]+1;
  47. 			ways[it]=ways[a];
  48. 		   }
  49. 		   else{
  50. 		   	if(level[it]==level[a]+1){
  51. 		   		ways[it] = ways[it] + ways[a];
  52.  
  53. 		   	}
  54. 		   }
  55. 	   }
  56. 	}
  57.  
  58. 	for(int i=1;i<=n;i++){
  59. 		cout<< ways[i] << " ";
  60.  
  61.  
  62. 	}
  63. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
copy 
4 4
1 2
1 3
2 4
3 4
1
stdout
copy 
1 1 1 2
https://ideone.com/Tkzmnp
language:
C++14 (gcc 8.3)
created:
1 day 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!