Substring of string

I want to get all possible substrings of a string s excluding the duplicates.

eg: abba



Bold are repeated how to exclude it?

I know only C.

Thanks in advance :slight_smile:

You can get a substring’s hash in O(1) with some precalculations. Just iterate through all(O(N^2)) and store their hash code into a hash table. Every time you find a new code: print the substring or retain its position, whatever you like.

C implementation please! I mean without hash i am not concerned about complexity first want to learn the brute force algorithm!