Online Gcd
Number Elimination
B - Adjacent Chmax
F - Manhattan Cafe
G - Yet Another RGB Sequence
D - Sets Scores
G - Random Student ID
Codeforces Round #541 (Div. 2) F. Asya And Kittens
Educational Codeforces Round 61 (Rated for Div. 2) C. Painting the Fence
Codeforces Round #547 (Div. 3) E. Superhero Battle