235. Lowest Common Ancestor of a Binary Search Tree

class Solution {
    public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {
        if (root == null || root.val == p.val || root.val == q.val) return root;
        if (p.val < root.val && q.val < root.val) return lowestCommonAncestor(root.left, p, q);
        if (p.val > root.val && q.val > root.val) return lowestCommonAncestor(root.right, p, q);
        return root;
    }
}