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public class DiameterOfBinaryTree {

int diameter = 0;

public int diameterOfBinaryTree(TreeNode root) {

computerDiameterOfBinaryTree(root);

return diameter;

}

private int computerDiameterOfBinaryTree(TreeNode root) {

if (root == null) return 0;

int leftHeight = computerDiameterOfBinaryTree(root.left);

int rightHeight = computerDiameterOfBinaryTree(root.right);

diameter = Math.max(diameter, leftHeight + rightHeight);

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

}

}