Sanket and Strings prob

#1

https://hack.codingblocks.com/contests/c/537/1569
in this ques, swapping characters means swapping characters from within the i/p string or from a-z?
and pls also explain the test case

Thanks

#2

Swapping characters means changing ‘a’ to ‘b’, or changing ‘b’ to ‘a’.

#3

In given test case
2
abba

you are allowed to change at max 2 characters
Hence you can change bb to aa, and hence you get maximum perfectness 4 as given in answer.

1 Like
#4

alright, got it, thanks!