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Problem110.java

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class Problem110 {

public static void main(String[] args) {

Problem110 p = new Problem110();

TreeNode root = new TreeNode(1);

root.left = new TreeNode(2);

root.left.left = new TreeNode(3);

root.left.left.left = new TreeNode(4);

root.left.left.left.left = new TreeNode(5);

System.out.println(p.isBalanced(root));

}

public boolean isBalanced(TreeNode root) {

if (root == null) return true;

int rightHeight = height(root.right);

int leftHeight = height(root.left);

if (rightHeight <0 || leftHeight <0) {

return false;

}

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

return true;

}

return false;

}

int height(TreeNode root) {

if (root == null) return 0;

int leftHeight = height(root.left);

int rightHeight = height(root.right);

int err = Math.abs(leftHeight - rightHeight);

if ( err > 1 || err < 0) {

return Integer.MIN_VALUE;

}

int val = Math.max(leftHeight, rightHeight) + 1;

return val;

}

}