添加 0108.将有序数组转换为二叉搜索树.md C语言版本

problems/0108.将有序数组转换为二叉搜索树.md

@@ -375,8 +375,25 @@ var sortedArrayToBST = function (nums) {
 };
 ```
 
+##C
+递归
+```c
+struct TreeNode* traversal(int* nums, int left, int right) {
+    if (left > right) 
+        return NULL;
+    int mid = left + ((right - left) / 2);
+    struct TreeNode* root = (struct TreeNode*)malloc(sizeof(struct TreeNode));
+    root->val = nums[mid];
+    root->left = traversal(nums, left, mid - 1);
+    root->right = traversal(nums, mid + 1, right);
+    return root;
+}
 
-
+struct TreeNode* sortedArrayToBST(int* nums, int numsSize) {
+    struct TreeNode* root = traversal(nums, 0, numsSize - 1);
+    return root;
+}
+```
 
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 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)