- 原题链接:[395. 至少有K个重复字符的最长子串](https://leetcode-cn.com/problems/longest-substring-with-at-least-k-repeating-characters/) - 题解链接: PS: 之前给出的题解听评论说现在会超时了,需要重新写一版 ---- - [ ] 输出题解 - [ ] 时间复杂度 - [ ] 是否最优解