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14 | 14 | | [650. 只有两个键的键盘](https://leetcode-cn.com/problems/2-keys-keyboard/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/2-keys-keyboard/solution/gong-shui-san-xie-yi-ti-san-jie-dong-tai-f035/) | 中等 | 🤩🤩🤩🤩 | |
15 | 15 | | [678. 有效的括号字符串](https://leetcode-cn.com/problems/valid-parenthesis-string/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/valid-parenthesis-string/solution/gong-shui-san-xie-yi-ti-shuang-jie-dong-801rq/) | 中等 | 🤩🤩🤩🤩🤩 | |
16 | 16 | | [1137. 第 N 个泰波那契数](https://leetcode-cn.com/problems/n-th-tribonacci-number/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/n-th-tribonacci-number/solution/gong-shui-san-xie-yi-ti-si-jie-die-dai-d-m1ie/) | 简单 | 🤩🤩🤩🤩 | |
| 17 | +| [1220. 统计元音字母序列的数目](https://leetcode-cn.com/problems/count-vowels-permutation/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/count-vowels-permutation/solution/gong-shui-san-xie-yi-ti-shuang-jie-xian-n8f4o/) | 困难 | 🤩🤩🤩🤩 | |
17 | 18 | | [1751. 最多可以参加的会议数目 II](https://leetcode-cn.com/problems/maximum-number-of-events-that-can-be-attended-ii/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/maximum-number-of-events-that-can-be-attended-ii/solution/po-su-dp-er-fen-dp-jie-fa-by-ac_oier-88du/) | 困难 | 🤩🤩🤩 | |
18 | 19 | | [1787. 使所有区间的异或结果为零](https://leetcode-cn.com/problems/make-the-xor-of-all-segments-equal-to-zero/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/make-the-xor-of-all-segments-equal-to-zero/solution/gong-shui-san-xie-chou-xiang-cheng-er-we-ww79/) | 困难 | 🤩🤩🤩🤩 | |
19 | 20 | | [剑指 Offer 10- I. 斐波那契数列](https://leetcode-cn.com/problems/fei-bo-na-qi-shu-lie-lcof/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/fei-bo-na-qi-shu-lie-lcof/solution/gong-shui-san-xie-yi-ti-si-jie-dong-tai-9zip0/) | 简单 | 🤩🤩🤩🤩🤩 | |
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