Hi
I think something is wrong here!
I wrote a code for problem 745B - Hongcow Solves A Puzzle and got two different verdict
23067626 Hack
23072618 Accept
I also use codeforces compare system to figure out if there is any different between this 2 code (you can see the result below )
as you can see there is no different :D
This submission was hacked. You submitted the first and actually correct solution but then resubmitted and got hacked.
I think you are right
but in pervasively contest ( i can't remember the exact time of the contest ) I submit 3 different code for a problem and got accept on my second solution ( all of my solution got pretest pass and non of them hack! )