Balanced Binary Tree

Balanced Binary Tree first search

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.

Balanced Binary Tree Solution

/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
public class BalancedBinaryTree {
    boolean balanced = true;

    public boolean isBalanced(TreeNode root) {
        height(root);
        return balanced;
    }

    private int height(TreeNode root) {
        if(root == null) {
            return 0;
        }

        int leftHeight = height(root.left);
        int rightHeight = height(root.right);

        if(Math.abs(leftHeight - rightHeight) > 1) {
            balanced = false;
        }

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

Last modified October 4, 2020