F - Score of Permutations
G - Divisors of Binomial Coefficient
F - Treasure Hunting
E - Swap
F - Stamp Game
Codeforces Round #468 (Div. 2, based on Technocup 2018 Final Round) C. Laboratory Work
Codeforces Round #467 (Div. 1) A. Save Energy!
Educational Codeforces Round 38 (Rated for Div. 2) C. Constructing Tests
Codeforces Round #469 (Div. 1) B. A Leapfrog in the Array
Educational Codeforces Round 40 (Rated for Div. 2) C. Matrix Walk