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4 | 4 | | [419. 甲板上的战舰](https://leetcode-cn.com/problems/battleships-in-a-board/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/battleships-in-a-board/solution/gong-shui-san-xie-ji-chong-sao-miao-xian-trmc/) | 中等 | 🤩🤩🤩🤩 | |
5 | 5 | | [423. 从英文中重建数字](https://leetcode-cn.com/problems/reconstruct-original-digits-from-english/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/reconstruct-original-digits-from-english/solution/gong-shui-san-xie-nao-jin-ji-zhuan-wan-m-vg7a/) | 中等 | 🤩🤩🤩🤩 | |
6 | 6 | | [440. 字典序的第K小数字](https://leetcode-cn.com/problems/k-th-smallest-in-lexicographical-order/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/k-th-smallest-in-lexicographical-order/solution/by-ac_oier-m3zl/) | 困难 | 🤩🤩🤩 | |
| 7 | +| [672. 灯泡开关 II](https://leetcode.cn/problems/bulb-switcher-ii/) | [LeetCode 题解链接](https://leetcode.cn/problems/bulb-switcher-ii/solution/by-ac_oier-3ttx/) | 中等 | 🤩🤩🤩🤩🤩 | |
7 | 8 |
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