Transform a BST to greater sum tree

PROBLEM :

Transform a BST to greater sum tree

Given a BST, transform it into greater sum tree where each node contains sum of all nodes greater than that node.



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SIMPLE c++ IMPLEMENTATION :
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/*
typedef struct BST
{
int info ;
struct BST *left ;
struct BST *right ;
}tree ;                                 */

void trasform_greatest_sum_tree(tree **,int *) ;

tree* greater_sum_tree(tree *root)
{
if(root==NULL)
return root;

int sum=0 ;
trasform_greatest_sum_tree(&root,&sum) ;
return root ;
}

void trasform_greatest_sum_tree(tree **root,int *sum)
{
if((*root)==NULL)
return ;
int temp ;
trasform_greatest_sum_tree(&(*root)->right,&(*sum)) ;
temp=(*root)->info ;
(*root)->info=(*sum) ;
(*sum)=(*sum)+temp  ;
trasform_greatest_sum_tree(&(*root)->left,&(*sum)) ;
}


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