No same permutations

[AASTHA011 (AASTHA SATIJA)]

question:https://hack.codingblocks.com/practice/p/406/908
https://ide.codingblocks.com/s/63285
not getting answer

[Bittoo-Aggarwal-1179774968833362 (Bittoo Aggarwal)]

please check your line 16 , if still unable to find mistake check the given solution

https://ide.codingblocks.com/s/65739

[Hothrik-Deeti-2325993551064540 (Hothrik Deeti)]

in the above solution set is being used, how can we do without using set