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/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* TreeNode *left;
* TreeNode *right;
* TreeNode(int x) : val(x), left(NULL), right(NULL) {}
* };
*/
class Solution {
private:
int num = 0;
public:
TreeNode* convertBST(TreeNode* root) {
if(!root) return root;
convertBST(root->right);
root->val+=num;
num = root->val;
convertBST(root->left);
return root;
}
};