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  1. #include<iostream>
  2. #include<queue>
  3.  
  4. using namespace std;
  5.  
  6. int n, arr[100][100], par[100], vis[100], ans[100];
  7.  
  8. void bfs(int start, int end){
  9. 	queue<int> Q;
  10. 	Q.push(start);
  11. 	par[start] = -1;vis[start] = 1;
  12. 	bool found = false;
  13. 	while(Q.size() > 0){
  14. 		int v = Q.front();
  15. 		Q.pop();
  16. 		if(v == end){
  17. 			found = true;
  18. 			break;
  19. 		}
  20. 		for(int i = 1;i <= n;i++){
  21. 			if(arr[v][i] == 0 || vis[i] == 1) continue;
  22. 			Q.push(i);vis[i] = 1;
  23. 			par[i] = v;
  24. 		}
  25. 	}
  26. 	if(found == false){
  27. 		cout << "No Path Found" << endl;return;
  28. 	}
  29. 	int curr = end, len = 0;
  30. 	while(curr != -1){
  31. 		ans[len++] = curr;
  32. 		curr = par[curr];
  33. 	}
  34. 	for(int i = len-1;i >= 1;i--) cout << ans[i] << " " << ans[i-1] << endl;
  35. }
  36.  
  37. int main(){
  38. 	n = 5;
  39. 	arr[1][2] = 1;arr[2][1] = 1;
  40. 	arr[2][4] = 1;arr[4][2] = 1;
  41. 	arr[4][5] = 1;arr[5][4] = 1;
  42. 	arr[3][4] = 1;arr[4][3] = 1;
  43.  
  44. 	bfs(1, 3);
  45.  
  46. 	return 0;
  47. }
Success #stdin #stdout 0s 3456KB
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https://ideone.com/X8QnNu
language:
C++14 (clang 8.0)
created:
9 years ago
visibility:
public

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