Hello Codeforces,
It has been a long while, but in this project we close the long-standing open problem proposed by Umnik 2021. You can try it here (deployed on my tiny server, be nice!) while supplies last. Currently I only imported problems from Codeforces & BZOJ (the dead Chinese OJ) but adding other OJs should be easy as long as we have the statements crawled (PRs?).
Cheers!