https://leetcode.com/problems/search-in-a-binary-search-tree/

Leetcode: 700. Search in a Binary Search Tree

/**
 * Definition for a binary tree node.
 * type TreeNode struct {
 *     Val int
 *     Left *TreeNode
 *     Right *TreeNode
 * }
 */
func searchBST(root *TreeNode, val int) *TreeNode {
    if root == nil || root.Val == val {
        return root
    }
    if val < root.Val {
        return searchBST(root.Left, val)
    }
    return searchBST(root.Right, val)
}