algorithm/Week_03/id_140/Leetcode_104_140.java at master · feixiangcode/algorithm · GitHub

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/**

* 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.

* Note: A leaf is a node with no children.

* Example:

* Given binary tree [3,9,20,null,null,15,7],

* 3

* / \

* 9 20

* / \

* 15 7

* return its depth = 3.

public class Leetcode_104_140 {

public int maxDepth(TreeNode root) {

return(depth(root, 0));

}

int depth(TreeNode node, int depth) {

if(node == null) return depth;

return Math.max(depth(node.left, depth+1), depth(node.right, depth+1));

}

public class TreeNode {

int val;

TreeNode left;

TreeNode right;

TreeNode(int x) { val = x; }

}

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