GG

#include <ctime>
#include <iostream>

struct Tree
{
 Tree *left;
 Tree *right;
};

Tree *CreateTree(int n)
{
 if(n <= 0) return NULL;
 Tree *t = new Tree;
 t->left = CreateTree(n - 1);
 t->right = CreateTree(n - 1);
 return t;
}

void DeleteTree(Tree *t)
{
 if(t)
 {
  DeleteTree(t->left);
  DeleteTree(t->right);
  delete t;
 }
}

int main(int argc, char *argv[])
{
 clock_t start=clock();
 for(int i = 0;i < 15;i++) DeleteTree(CreateTree(22));
 clock_t endt=clock();
 std::cout <<"Time: " <<
    double(endt-start)/CLOCKS_PER_SEC * 1000 << " ms\n";
}