Codeforces Round 573 (Div. 1) B. Tokitsukaze, CSL and Stone Game
Codeforces Round 575 (Div. 3) E. Connected Component on a Chessboard
Ice Cream Parlor
Two Characters
Super Reduced String
Flatland Space Stations
Zig Zag Sequence
Educational Codeforces Round 71 (Rated for Div. 2) D. Number Of Permutations
Manthan, Codefest 19 (open for everyone, rated, Div. 1 + Div. 2) C. Magic Grid
Codeforces Round 582 (Div. 3) G. Path Queries