Codeforces Round 568 (Div. 2) G2. Playlist for Polycarp (hard version)
Codeforces Round 568 (Div. 2) G1. Playlist for Polycarp (easy version)
Educational Codeforces Round 67 (Rated for Div. 2) E. Tree Painting
Codeforces Round 574 (Div. 2) E. OpenStreetMap
Monk’s birthday treat
Where is Checkerboard
Double Permutation
Game of Cubes
Bruce and the Chocolates
Codeforces Round 577 (Div. 2) D. Treasure Hunting