Codeforces Round #919 D is very similar to https://codeforces.me/contest/381/problem/C. I noticed this whilst in the round , but i submitted the correct answer after the system test.Correcting the input format and a very simple modification to the code i sent previously got accepted.
My Submission to Codeforces Round #919 D : https://codeforces.me/contest/1920/submission/241490363
My Submission to Codeforces Round #223 C : https://codeforces.me/contest/381/submission/222796358
Note that this is not a proposal to make the round unrated.
All the problems this round felt pretty standard.
The exist problems cannot be avoided. If you find this, you're lucky, but actually there's few contestants found that.