> Use on Codeforces, which lacks 64-bit support and where solutions can be hacked codeforces has 64 bit support for a while now https://github.com/kth-competitive-programming/kactl/blob/main/content/strings/Hashing-codeforces.h#L7
codeforces has 64 bit support for a while now
https://github.com/kth-competitive-programming/kactl/blob/main/content/strings/Hashing-codeforces.h#L7