Balanced Binary Tree

Balanced Binary Tree 

问题：

Given a binary tree, determine if it is height-balanced.

For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more than 1.

思路：

　　典型的dfs

我的代码：

public class Solution {

    public boolean isBalanced(TreeNode root) {

        if(root == null) return true;

        int leftHeight = getHeight(root.left);

        int rightHeight = getHeight(root.right);

        if(Math.abs(leftHeight - rightHeight) <= 1)

        {

            return isBalanced(root.left) && isBalanced(root.right);

        }

        return false;

    }

    public int getHeight(TreeNode root)

    {

        if(root == null)    return 0;

        return Math.max(getHeight(root.left),getHeight(root.right)) + 1;

    }

}

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