message: Update range-sum-of-bst.cpp
diff: @@ -40,8 +40,8 @@ public:
  int rangeSumBST(TreeNode* root, int L, int R) {
  return (root == nullptr) ?
  0 : (L <= root->val && root->val <= R) * root->val +
  - (L <= root->val) * rangeSumBST(root->left, L, R) +
  - (root->val <= R) * rangeSumBST(root->right, L, R);
  + ((L <= root->val) ? rangeSumBST(root->left, L, R) : 0) +
  + ((root->val <= R) ? rangeSumBST(root->right, L, R) : 0);
  }
  };
  