void postorder_helper(struct node *root, int *arr, int *i){
if (root)
{
postorder_helper(root->left, arr, i);
postorder_helper(root->right, arr, i);
arr[*i] = root->data;
(*i)++;
}
}
void postorder_helper(struct node *root, int *arr,int *ind){
if (root == NULL)
return;
postorder_helper(root->left, arr,ind);
postorder_helper(root->right, arr,ind);
arr[*ind] = root->data;
*ind = *ind + 1;
}
void postorder(struct node *root, int *arr)
{
int i = 0;
if (root && arr)
{
postorder_helper(root, arr, &i);
}
}
void postorder(struct node *root, int *arr){
if (arr == NULL)
return;
int ind = 0;
postorder_helper(root, arr, &ind);
}