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  1. //
  2. //  main.cpp
  3. //  BFS Graph
  4. //
  5. //  Created by Himanshu on 26/08/21.
  6. //
  7. #include <iostream>
  8. #include <queue>
  9. using namespace std;
  10.  
  11. //s= source
  12. //n = number of nodes in graph
  13. void BFS (int s, int n, vector<int> graph[]) {
  14.     if (s == 0) {
  15.         return;
  16.     }
  17.     int vis[n+1];
  18.     queue<int> qu;
  19.  
  20.     for (int i=1; i<=n; i++) {
  21.         vis[i] = 0;
  22.     }
  23.     qu.push(s);
  24.     vis[s] = 1;
  25.     cout<<"BFS:"<<endl;
  26.     cout<<s<<endl;
  27.     while (!qu.empty()) {
  28.         int node = qu.front();
  29.         qu.pop();
  30.         for (int i=0; i<graph[node].size(); i++) {
  31.             int j = graph[node][i];
  32.             if (vis[j] == 0) {
  33.                 vis[j] = 1;
  34.                 qu.push(j);
  35.                 cout<<j<<" ";
  36.             }
  37.         }
  38.         cout<<endl;
  39.     }
  40.     cout<<endl;
  41. }
  42.  
  43.  
  44. int main() {
  45.     int s = 1, n = 5;
  46.     vector<int> graph[n+1];
  47.     graph[1].push_back(2);
  48.     graph[1].push_back(3);
  49.     graph[2].push_back(1);
  50.     graph[2].push_back(4);
  51.     graph[3].push_back(1);
  52.     graph[3].push_back(5);
  53.     graph[4].push_back(2);
  54.     graph[4].push_back(5);
  55.     graph[5].push_back(3);
  56.     graph[5].push_back(4);
  57.  
  58.     cout<<"Graph:"<<endl;
  59.     for (int i=1; i<=n; i++) {
  60.         cout<<i<<": ";
  61.         for (int j=0; j<graph[i].size(); j++) {
  62.             cout<<graph[i][j]<<" ";
  63.         }
  64.         cout<<endl;
  65.     }
  66.     cout<<endl;
  67.     BFS(s, n, graph);
  68.     return 0;
  69. }
  70.  
Success #stdin #stdout 0s 5572KB
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stdin
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Standard input is empty
stdout
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Graph:
1: 2 3 
2: 1 4 
3: 1 5 
4: 2 5 
5: 3 4 

BFS:
1
2 3 
4 
5
https://ideone.com/KobplI
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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