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class Solution {

public boolean isBalanced(TreeNode root) {

return helper(root)!=-1;

}

public int helper(TreeNode root)

{

if(root == null) return 0;

int left = helper(root.left);

if(left == -1) return -1; //左子树不平衡直接返回-1

int right = helper(root.right);

if(right == -1) return -1; //右子树不平衡直接返回-1

return Math.abs(left - right) > 1 ? -1 : 1 + Math.max(left, right);

}

}