How can I solve this? Anyone give hint?

Question

Input : a = 'abcab'
Output: 2

Because the 'cab' word presents in a two times.i.e. cab ,cab.

Answer 1

It could also be "bac" and "bac". Tell whether is there any other input regarding a starting value or a reference point?

Answer 2

If s = 'abab'

Distinct
Substrings are 'ab', 'ba'. By deleting one 'a' and 'b'