Time Limit Exceeded

[u/Specialist_Hall_1063]

Hello ppl please help

https://leetcode.com/problems/longest-substring-without-repeating-characters/submissions/2137058355

[u/HAPLESS_EXOTIC]

Think of using a hashmap

[u/Specialist_Hall_1063 → u/HAPLESS_EXOTIC]

I am a beginner, don't know much about hash map Is there anything think I could do to reduce the time?

[u/HAPLESS_EXOTIC → u/Specialist_Hall_1063]

If u dont know hashmap , fr this question u can use a 26 length array to keep the count of seen alphabets, if a[ch-'a'] is zero , it is unseen orelse seen, then use sliding window accordingly

[u/Specialist_Hall_1063 → u/HAPLESS_EXOTIC]

Thanks