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 
with the output showing as 2 whereas the output showed 3 in multiple online compilers like 
and
, 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.
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Auto comment: topic has been updated by Phantom_Dracula (previous revision, new revision, compare).
In the last for, you are asking for the $$$n$$$ position, which do not exist. The verdict isn't Runtime error because sometimes C++ just access to the memory space and gets garbage.