Gone crazy while solving problem 1874E - Jellyfish and Hack. I optimized my solution with best effort, and its execution time decreased from 20s at first to about 6s now (locally), but it got TLE on codeforces (time limit 8s).

When I was wondering how small the constant could be to pass the problem, I realized that I submitted with C++17(32), and I wanted to switch the language into C++17(64), but where is it???

What's more annoying is that almost all accepted submissions to this problem used C++17(64), mostly with an execution time longer than half of the time limit, so I think this problem can hardly be passed without C++17(64).

When can we have our C++17(64) back?