**My code is bellow, but the result of "run code"(res = 5) with "submit"(res = 4, which is wrong) is different, using sample [3,1,null,null,2]. Do you met this?**

Thx

```
map<TreeNode*, int> add2val = {{0, 0}};
class Solution {
public:
int rob(TreeNode* root) {
if(root)
{
int valLeft = rob(root -> left);
int valRight = rob(root -> right);
int valRoot = max(valLeft + valRight, root -> val
+ (root -> left ? add2val[root -> left -> left] : 0)
+ (root -> left ? add2val[root -> left -> right] : 0)
+ (root -> right ? add2val[root -> right -> left] : 0)
+ (root -> right ? add2val[root -> right -> right] : 0));
add2val.insert(pair<TreeNode*, int>(root, valRoot));
return valRoot;
}
return 0;
}
};
```