README.md

Author: bestgopher

README.md

@@ -2,7 +2,7 @@
 
 | Total | Easy | Medium | Hard |
 | :----: | :----: | :----: | :----: |
-| 260 | 126 | 128 | 6 |
+| 261 | 126 | 129 | 6 |
 
 ### 题目
 
@@ -173,6 +173,7 @@
 |367    | 有效的完全平方数 | [src](https://github.com/rustors/leetcode/blob/main/src/bin/valid-perfect-square.rs) | [leetcode](https://leetcode-cn.com/problems/valid-perfect-square/) | Easy |
 |371    | 两整数之和 | [src](https://github.com/rustors/leetcode/blob/main/src/bin/sum-of-two-integers.rs) | [leetcode](https://leetcode-cn.com/problems/sum-of-two-integers/) | Medium |
 |374    | 猜数字大小 | [src](https://github.com/rustors/leetcode/blob/main/src/bin/guess-number-higher-or-lower.rs) | [leetcode](https://leetcode-cn.com/problems/guess-number-higher-or-lower/) | Easy |
+|380    | O(1) 时间插入、删除和获取随机元素 | [src](https://github.com/rustors/leetcode/blob/main/src/bin/insert-delete-getrandom-o1.rs) | [leetcode](https://leetcode-cn.com/problems/insert-delete-getrandom-o1/) | Medium |
 |383    | 赎金信 | [src](https://github.com/rustors/leetcode/blob/main/src/bin/ransom-note.rs) | [leetcode](https://leetcode-cn.com/problems/ransom-note/) | Easy |
 |383    | 赎金信 | [src](https://github.com/rustors/leetcode/blob/main/src/bin/ransom-note.rs) | [leetcode](https://leetcode-cn.com/problems/ransom-note/) | Easy |
 |387    | 字符串中的第一个唯一字符 | [src](https://github.com/rustors/leetcode/blob/main/src/bin/first-unique-character-in-a-string.rs) | [leetcode](https://leetcode-cn.com/problems/first-unique-character-in-a-string/) | Easy |