ProblemSolving/LC110.java at main · MriteshAdak/ProblemSolving · GitHub

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/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode() {}
 *     TreeNode(int val) { this.val = val; }
 *     TreeNode(int val, TreeNode left, TreeNode right) {
 *         this.val = val;
 *         this.left = left;
 *         this.right = right;
 *     }
 * }
 */
class Solution {
    public boolean isBalanced(TreeNode root) {
        return checkBalance(root) != -1;
    }

    private int checkBalance(TreeNode node) {

        if (node == null) {
            return 0;
        }

        int leftHeight = checkBalance(node.left);
        if (leftHeight == -1) {
            return -1;
        }

        int rightHeight = checkBalance(node.right);
        if (rightHeight == -1) {
            return -1;
        }

        if (Math.abs(leftHeight - rightHeight) > 1) {
            return -1;
        }

        return 1 + Math.max(leftHeight, rightHeight);
    }
}

//Solved