Pythonで LeftStrRightStr Substringなどの処理はsliceのみです。 ↑のコードは、2文字目〜3文字目を取得できます s2 = 「いう」です。

# Given a string s and an integer k, return the length of the longest # substring of s such that the frequency of each character in # this substring is greater than or equal to k. # if no such ...

The key idea is to use a sliding window approach with two pointers. Maintain a window (substring) using two pointers, and a set to track characters within the current window. Move the right pointer to ...