update

Author: w2xi

README.md

@@ -106,7 +106,7 @@
 |617|[合并二叉树](https://leetcode.cn/problems/merge-two-binary-trees/)|[JavaScript](./algorithms/merge-two-binary-trees.js)|Easy|
 |628|[三个数的最大乘积](https://leetcode.cn/problems/maximum-product-of-three-numbers/)|[JavaScript](./algorithms/maximum-product-of-three-numbers.js)|Easy|
 |637|[二叉树的层平均值](https://leetcode.cn/problems/average-of-levels-in-binary-tree/)|[JavaScript](./algorithms/average-of-levels-in-binary-tree.js)|Easy|
-|645|[错误的集合](https://leetcode.cn/problems/set-mismatch/)|[JavaScript](./algorithms/set-mismatch.js)||Easy|
+|645|[错误的集合](https://leetcode.cn/problems/set-mismatch/)|[JavaScript](./algorithms/set-mismatch.js)|Easy|
 |687|[最长同值路径](https://leetcode.cn/problems/longest-univalue-path/)|[JavaScript](./algorithms/longest-univalue-path.js)|Medium|
 |700|[二叉搜索树中的搜索](https://leetcode.cn/problems/search-in-a-binary-search-tree/)|[JavaScript](./algorithms/search-in-a-binary-search-tree.js)|Easy|
 |704|[二分查找](https://leetcode.cn/problems/binary-search/)|[JavaScript](./algorithms/binary-search.js)|Easy|