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LeetCode:Maximum Depth of Binary Tree

Given a binary tree, find its maximum depth.

The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

 

 1 class Solution{ 2 public: 3     int maxDepth(TreeNode *root){ 4         if(root==NULL) 5         { 6             return 0; 7         } 8         int a=maxDepth(root->left); 9         int b=maxDepth(root->right);10         return (a>b?a:b)+1;11     }12 };