if I have an array {ab,ab,cd,ef,gh}
at i = 1, we will get “abab” and “ab” for the next iteration but we know “abab…” cannot be our answer but here until we reach the end of the vector we cannot eliminate “abab…”
we can optimize here.
Not useful operations
I am suggesting that we can do in this way too 
@nikhilsrivastavaone thank you for your suggestion! You can mail it on [email protected] so it reaches the team
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Ok, 
Thank you.