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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int graph[1001][1001];
  4. int visit[1001];
  5. int n, e;
  6.  
  7. void BFS(int start)
  8. {
  9.     //Initial Step
  10.     visit[start] = 1;
  11.     cout<<start<<" ";
  12.     queue<int>Q;
  13.     Q.push(start);
  14.  
  15.     //Repeating Step
  16.     while(!Q.empty())
  17.     {
  18.         int x = Q.front();
  19.         Q.pop();
  20.         for(int j = 1; j <= n; j++)
  21.         {
  22.             if(visit[j] == 0 && graph[x][j] != 0)
  23.             {
  24.                 visit[j] = 1;
  25.                 cout<<j<<" ";
  26.                 Q.push(j);
  27.             }
  28.         }
  29.  
  30.  
  31.     }
  32.  
  33.  
  34.  
  35.  
  36.  
  37. }
  38.  
  39. int main()
  40. {
  41.     cin>>n>>e;
  42.     int u, v;
  43.     for(int i = 1; i <= e; i++)
  44.     {
  45.         cin>>u>>v;
  46.         graph[u][v] = 1;
  47.         graph[v][u] = 1;
  48.     }
  49.  
  50.     BFS(1);
  51. }
  52.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
10 13
1 2
1 4
4 3
2 3
3 9
3 10
2 5
2 7
2 8
5 6
5 7
5 8
7 8
stdout 
1 2 4 3 5 7 8 9 10 6
https://ideone.com/uPmp9p
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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