Delete and Cut Game
Shift and Replace
Scoring stores
Codeforces Round 685 (Div. 2) E1. Bitwise Queries (Easy Version)
Codeforces Global Round 11 D. Unshuffling a Deck
Codeforces Round 682 (Div. 2) C. Engineer Artem
Codeforces Round 686 (Div. 3) E. Number of Simple Paths
Codeforces Round 691 (Div. 1) B. Glass Half Spilled
A plane journey
Gears in a machine