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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. vector< int > vis , id;
  4. vector< vector< int > > graph;
  5. void dfs( int node , int cnt)
  6. {
  7. 	vis[node] = 1;
  8. 	id[node] = cnt;
  9. 	for( int u : graph[node] )
  10. 	{
  11. 		if( !vis[u] )
  12. 			dfs(u,cnt);
  13. 	}
  14. }
  15. int main()
  16. {
  17. 	int nodes, edges;
  18. 	cin >> nodes;      // input number of nodes in graph
  19. 	cin >> edges;
  20. 	vis.resize(nodes+1, 0);
  21. 	id.resize(nodes+1, 0);
  22. 	graph.resize(nodes+1);
  23. 	for( int i = 0 ; i < edges ; i++)
  24. 	{
  25. 		int u , v ;
  26. 		cin >> u >> v;
  27. 		graph[u].push_back(v);      // we can use a pair of (v,cost) in case of weighted graph
  28. 		graph[v].push_back(u);      // if graph is Directed this line will be omitted.
  29. 	}
  30.  
  31. 	int cnt = 1 ;
  32. 	for( int i =1 ; i <= nodes ; i++)
  33. 	{
  34. 		if( !vis[i] )
  35. 		{
  36. 			dfs(i, cnt++);
  37. 		}
  38.  
  39. 	}
  40.  
  41. 	while(true)
  42. 	{
  43. 		int a, b ;
  44. 		cin >> a >> b;
  45. 		if( id[a] == id[b] )
  46. 			cout << "In same connected component\n";
  47. 		else cout << "In different connected component\n";
  48. 	}
  49.  
  50. 	return 0;
  51. }
Runtime error #stdin #stdout #stderr 0s 3472KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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terminate called after throwing an instance of 'std::length_error'
  what():  vector::_M_fill_insert
https://ideone.com/ROESkt
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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