LeetCode-Go/leetcode/0235.Lowest-Common-Ancestor-of-a-Binary-Search-Tree/235. Lowest Common Ancestor of a Binary Search Tree.go

package leetcode

import (
	"github.com/halfrost/LeetCode-Go/structures"
)

// TreeNode define
type TreeNode = structures.TreeNode

/**
 * Definition for a binary tree node.
 * type TreeNode struct {
 *     Val int
 *     Left *TreeNode
 *     Right *TreeNode
 * }
 */

func lowestCommonAncestor(root, p, q *TreeNode) *TreeNode {
	if p == nil || q == nil || root == nil {
		return nil
	}
	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
}