/**
* struct TreeNode {
* int val;
* struct TreeNode *left;
* struct TreeNode *right;
* TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
* };
*/
class Solution {
public:
int run(TreeNode* root) {
// write code here
if(root==nullptr) return 0;
int l = run(root->left)+1;
int r = run(root->right)+1;
if(l>1&&r>1) return min(l, r);
else return max(l,r);
}
};

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