Update README.md

skypesky · web-flow · commit 83037aa75392 · 2022-02-23T20:40:24.000+08:00
diff --git a/README.md b/README.md
@@ -94,6 +94,7 @@
 | [653. 两数之和 IV - 输入 BST](https://leetcode-cn.com/problems/two-sum-iv-input-is-a-bst/) | [题解](https://github.com//skypesky/leetcode-for-javascript/blob/master/653.%20%E4%B8%A4%E6%95%B0%E4%B9%8B%E5%92%8C%20IV%20-%20%E8%BE%93%E5%85%A5%20BST.md) | 递归,哈希表,迭代器 | successfully! |
 | [659. 分割数组为连续子序列](https://leetcode-cn.com/problems/split-array-into-consecutive-subsequences/) | [题解](https://github.com//skypesky/leetcode-for-javascript/blob/master/659.%20%E5%88%86%E5%89%B2%E6%95%B0%E7%BB%84%E4%B8%BA%E8%BF%9E%E7%BB%AD%E5%AD%90%E5%BA%8F%E5%88%97.md) | 哈希表 | 没想出来,有点难理解 |
 | [665. 非递减数列](https://leetcode-cn.com/problems/non-decreasing-array/) | [题解](https://github.com/skypesky/leetcode-for-javascript/blob/master/665.%20%E9%9D%9E%E9%80%92%E5%87%8F%E6%95%B0%E5%88%97.md) | 放大还是缩小呢 | 一下子难以想到位 |  
+| [671. 二叉树中第二小的节点](https://leetcode-cn.com/problems/second-minimum-node-in-a-binary-tree/) | [题解](https://github.com//skypesky/leetcode-for-javascript/blob/master/671.%20%E4%BA%8C%E5%8F%89%E6%A0%91%E4%B8%AD%E7%AC%AC%E4%BA%8C%E5%B0%8F%E7%9A%84%E8%8A%82%E7%82%B9.md) | 深度优先遍历 | successfully! |
 | [676. 实现一个魔法字典](https://leetcode-cn.com/problems/implement-magic-dictionary) | [题解](https://github.com//skypesky/leetcode-for-javascript/blob/master/676.%20%E5%AE%9E%E7%8E%B0%E4%B8%80%E4%B8%AA%E9%AD%94%E6%B3%95%E5%AD%97%E5%85%B8.md) | 哈希表 | |
 | [690. 员工的重要性](https://leetcode-cn.com/problems/employee-importance/) | [题解](https://github.com/skypesky/leetcode-for-javascript/blob/master/690.%20%E5%91%98%E5%B7%A5%E7%9A%84%E9%87%8D%E8%A6%81%E6%80%A7.md) | 哈希表, 递归 |  |  
 | [692. 前K个高频单词](leetcodeUrl) | [题解](https://github.com//skypesky/leetcode-for-javascript/blob/master/692.%20%E5%89%8DK%E4%B8%AA%E9%AB%98%E9%A2%91%E5%8D%95%E8%AF%8D.md) | 哈希表,堆排序 | |
