39、平衡二叉树

题目描述
输入一棵二叉树，判断该二叉树是否是平衡二叉树。

public class Solution {
    public boolean IsBalanced_Solution(TreeNode root) {
        if(root!=null){
            int left = TreeDepth(root.left);
            int right = TreeDepth(root.right);
            if(left-right>1||right-left>1){
                return false;
            }else{
                boolean leftB = IsBalanced_Solution(root.left);
                boolean rightB = IsBalanced_Solution(root.right);
                return leftB&&rightB;
            }
        }
        return true;
    }
    
    public int TreeDepth(TreeNode root) {
        if(root!=null){
            int left = TreeDepth(root.left);
            int right = TreeDepth(root.right);
            if(left>=right){
                return left+1;
            }else{
                return right+1;
            }
        }
        
        return 0;
    }

}