substring - Min size subset of string with unique characters

Question

Given a string find min non reapeating substring of that string.

Test1 : ababababababab Output : ab

Test2: abcd Output : abcd

Pls help how to do it.

question from:https://stackoverflow.com/questions/65662030/min-size-subset-of-string-with-unique-characters

Answer 1

Waitting for answers