I was recently trying to research my chances of qualifying for ACM ICPC by looking at the latest regionals I could find problems for, ACPC 2015, which can be found at the ACM-ICPC Live Archive. I had first solved a few of the problems on the Hackerrank instance before I found the official one, but when I tried submitting my code that solved the Hackerrank instance of them it would give WA on the ICPC OJ.

Also it seems there are no successful submissions whatsoever to the whole contest on the whole OJ which seems suspicious. Does anyone know if the ICPC OJ is known for having wrong test cases? Or is output formatting more strict or something?

As a reference to test it if anyone wants to try to solve the very easiest problem (it's div 2 problem A level) they can try here.

My code for solving it was this. And I really can't see how it should be wrong, and also as previously mentioned the Hackerrank instance accepted it.

If anyone could help enlighten me that would be awesome.