LCM findFirstCommonAncestor

TreeNode findFirstCommonAncestor(TreeNode root, int p, int q) { if (root == null) { return null; } if (root.value == p || root.value == q) { return root; } if (root.value > p && root.value > q ) { return findFirstCommonAncestor(root.left, p, q); } else if (root.value < p && root.value < q ) { return findFirstCommonAncestor(root.right, p, q); } else { return root; } }