It happens during last Div.4

In this submission in compilation log you can see only warnings, no errors, but verdict is CE

So experimentally I figured out that an error in line 1285, ofc locally it works good with C++17:

constexpr auto darr = array<pair<int, int>, 4>{{{1, 0}, {0, 1}, {-1, 0}, {0, -1}}};

Will be nice if codeforces show full compilation log or somehow print errors first