Take a look at the end of these two programs:

https://atcoder.jp/contests/abc188/submissions/19361247

https://atcoder.jp/contests/abc188/submissions/19361394

One is correct and the other is not, even though in theory the one with std::min should be equivalent, since the first values of the arrays are all pairwise distinct.

EDIT: std::array variable holding fundamental types of local scope is not zero initialized (unlike other containers to my knowledge).