Write a program to Calculate Size of a tree

Size of a tree is the number of elements present in the tree.

Code :
Below code is recursive way of finding size .

/* function to return number of nodes in a tree. */
int size(struct node* node)
  if (node==NULL)
    return 0;
    return(size(node->left) + 1 + size(node->right));

Time & Space Complexities: Since this program is similar to traversal of tree, time and space complexities will be same as Tree traversal .

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