Hi, everybody. I created an open-source site that shows a list of unsolved Codeforces problems using (*drum roll*) Codeforces API.
Link: https://sadykhzadeh.github.io/unsolved-cf-problems/
Github: https://github.com/sadykhzadeh/unsolved-cf-problems
Why is my site better than its analogues?
1) My site shows your last submission link of each problem with the verdict, so you can quickly understand why you couldn't solve the problem.
2) My site supports Russian and English languages using intuitive buttons and logic as on the Codeforces site.
3) My site remembers your last entered handle. Every second counts, so that's why at the next session my site will immediately show you a list of problems.
4) Instant search problems by the name. Not faster than the speed of light, but fast enough for a competitive programmer :)
5) My site's engine is written in pure JavaScript. No Flask, no React, no other frameworks and libraries.