Minimum Depth of Binary Tree, Leetcode 解题笔记

Given a binary tree, find its minimum depth.

The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.

 * Definition for binary tree
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
public class Solution {
    public int minDepth(TreeNode root) {
        if(root == null) return 0;
        if(root.left == null) return minDepth(root.right)+1;
        if(root.right == null) return minDepth(root.left)+1;
        return Math.min(minDepth(root.left), minDepth(root.right)) + 1;

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s