程式語言 - LeetCode - C++ - 700. Search in a Binary Search Tree

參考資訊：
https://www.cnblogs.com/Dylan-Java-NYC/p/16419214.html

題目：


解答：

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 * };
 */
class Solution {
public:
    TreeNode* searchBST(TreeNode* root, int val) {
        while (root) {
            if (root->val > val) {
                root = root->left;
            }
            else if (root->val < val) {
                root = root->right;
            }
            else {
                return root;
            }
        }

        return NULL;
    }
};