https://codeforces.com/contest/936/problem/E
https://codeforces.com/contest/1267/problem/C
https://codeforces.com/contest/1912/problem/C
I ran a search and found these 3 problems that don't load in the problemset
Broken Problems
https://codeforces.com/contest/936/problem/E
https://codeforces.com/contest/1267/problem/C
https://codeforces.com/contest/1912/problem/C
I ran a search and found these 3 problems that don't load in the problemset