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# BST

## Q1: [Search in a Binary Search Tree](https://leetcode.com/problems/search-in-a-binary-search-tree/)

```cpp
/**
 * 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) {
        if(root == nullptr) return nullptr;
        while(root != nullptr) {
            if(root->val > val) {
                root = root -> left;
            }
            else if(root->val < val) {
                root = root -> right;
            }
            else 
                return root;
        }
        return nullptr;
    }

};
```