left_len = self.longestNiceSubstring(s[0:i]) # index 0 to i-1 right_len = self.longestNiceSubstring(s[i+1:len(s)+1]) # index i+1 to end Then if we see, all the characters have their lowercase and ...

Understand what the interviewer is asking for by using test cases and questions about the problem. Established a set (2-3) of test cases to verify their own solution later. Established a set (1-2) of ...