104. Maximum Depth of Binary Tree.cpp

class Solution {
public:
    int maxDepth(TreeNode* root) {
        if(root==NULL)
        return 0;
        int lh=maxDepth(root->left);
       int  rh=maxDepth(root->right);
        int height=max(lh,rh)+1;
        return height;
        
    }
};