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.

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public class Solution {
public static int maxDepth(TreeNode root) {
if(root==null)
return 0;
int rightDepth = maxDepth(root.right);
int leftDepth = maxDepth(root.left);
if(rightDepth>leftDepth)
return ++rightDepth;
return ++leftDepth;

}
}