In the most recent Div-3 Contest Codeforces Round 1027 (Div. 3), the 3rd problem titled Need More Arrays 2114C - Need More Arrays I submitted a simple C++ program 321476944 but the checker said it is wrong on line 5  with the output showing as 2 whereas the output showed 3 in multiple online compilers like and onecompiler, I actually do not care about the wrong submissions but just want to comprehend what the problem might be as to avoid the same in future.