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  1. //
  2. //  main.cpp
  3. //  BFS Binary Tree
  4. //
  5. //  Created by Himanshu on 26/08/21.
  6. //
  7.  
  8. #include <iostream>
  9. #include <queue>
  10. using namespace std;
  11.  
  12. struct node {
  13.     int value = 0;
  14.     struct node *left, *right;
  15. };
  16. typedef struct node Node;
  17.  
  18. node* newNode(int data)
  19. {
  20.     node* Node = new node();
  21.     Node->value = data;
  22.     Node->left = NULL;
  23.     Node->right = NULL;
  24.  
  25.     return(Node);
  26. }
  27.  
  28. void BFS (Node *root) {
  29.     if (root == NULL) {
  30.         return;
  31.     }
  32.     queue<Node*> qu;
  33.     qu.push(root);
  34.     int level = 0;
  35.     cout<<"Level order traversal:";
  36.     while (!qu.empty()) {
  37.         int size = (int) qu.size();
  38.         cout<<endl<<"Level: "<<level<<endl;
  39.         for (int i=0; i<size; i++) {
  40.              Node* curr = qu.front();
  41.              cout<<(curr->value)<<" ";
  42.              qu.pop();
  43.              if (curr->left) {
  44.                  qu.push(curr->left);
  45.              }
  46.              if (curr->right) {
  47.                  qu.push(curr->right);
  48.              }
  49.         }
  50.         level++;
  51.     }
  52.     cout<<endl;
  53. }
  54.  
  55. int main() {
  56.     Node *root = newNode(1);
  57.     root->left = newNode(20);
  58.     root->right = newNode(21);
  59.     root->right->left = newNode(30);
  60.     root->right->right = newNode(31);
  61.     BFS (root);
  62.     return 0;
  63. }
  64.  
Success #stdin #stdout 0s 5552KB
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stdin
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Standard input is empty
stdout
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Level order traversal:
Level: 0
1 
Level: 1
20 21 
Level: 2
30 31
https://ideone.com/aKazxd
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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