C/leetcode/src/700.c

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     struct TreeNode *left;
 *     struct TreeNode *right;
 * };
 */

struct TreeNode *searchBST(struct TreeNode *root, int val)
{
    if (!root)
        return NULL;

    if (root->val == val)
    {
        return root;
    }
    else if (root->val > val)
    {
        return searchBST(root->left, val);
    }
    else
    {
        return searchBST(root->right, val);
    }
}