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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int size,c=0;
  4. struct BstNode
  5. {
  6.   int data;
  7.   BstNode* left;
  8.   BstNode* right;
  9. };
  10.  
  11.  
  12. BstNode* insert(BstNode* root,int data)
  13. {
  14.   if(root==NULL)
  15.   {
  16.     root=new BstNode();
  17.     root->data=data;
  18.     root->left=root->right=NULL;
  19.   }
  20.   else if(data<root->data)
  21.   {
  22.     root->left=insert(root->left,data);
  23.   }
  24.   else
  25.   {
  26.     root->right=insert(root->right,data);
  27.   }
  28.   return root;
  29. }
  30. void preorderTraversal(BstNode* root)
  31. {
  32.   if(root!=NULL)
  33.   {
  34.  
  35.     c++;
  36.     if(c==size) cout<<root->data<<endl;
  37.     else cout<<root->data<<" ";
  38.     preorderTraversal(root->left);
  39.     preorderTraversal(root->right);
  40.   }
  41. }
  42. void inorderTraversal(BstNode* root)
  43. {
  44.   if(root!=NULL)
  45.   { 
  46.     inorderTraversal(root->left);
  47.     c++;
  48.     if(c==size) cout<<root->data<<endl;
  49.     else cout<<root->data<<" ";
  50.     inorderTraversal(root->right);
  51.   }
  52. }
  53. void postorderTraversal(BstNode* root)
  54. {
  55.   if(root!=NULL)
  56.   {
  57.     postorderTraversal(root->left);
  58.     postorderTraversal(root->right);
  59.     c++;
  60.     if(c==size) cout<<root->data<<endl;
  61.     else cout<<root->data<<" ";
  62.   }
  63. }
  64.  
  65. void deletepostorderTraversal(BstNode*& root)
  66. {
  67.   if(root!=NULL)
  68.   {
  69.     deletepostorderTraversal(root->left);
  70.     deletepostorderTraversal(root->right);
  71.     delete root;
  72.     root=NULL;
  73.   }
  74. }
  75. int main()
  76. {
  77.   int test_case;
  78.   while(cin>>test_case){
  79.     cin>>size;
  80.     BstNode* root=NULL; //create the root
  81.     for(int i=0;i<size;i++)
  82.     {
  83.       int data;cin>>data;
  84.       root=insert(root,data);
  85.     }   
  86.     c=0;
  87.     cout<<"Pre.: ";
  88.     preorderTraversal(root);
  89.     cout<<"In..: ";
  90.     c=0;
  91.     inorderTraversal(root);
  92.     cout<<"Post: ";
  93.     c=0;
  94.     postorderTraversal(root);
  95.     cout<<endl;
  96.     deletepostorderTraversal(root); //delete all the nodes 
  97.  
  98.     if(root==NULL) cout<<"Deleted"<<endl;
  99.  
  100.     // Start over creating a new root node with insert() ....
  101.   }
  102. }
  103.  
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
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2
4
1 2 3 4
4
1 2 3 4
stdout
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Pre.: 1 2 3 4
In..: 1 2 3 4
Post: 4 3 2 1

Deleted
Pre.: 2
In..: 2
Post: 2

Deleted
Pre.: 2 2 2 2
In..: 2 2 2 2
Post: 2 2 2 2

Deleted
https://ideone.com/oOCzHv
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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