Min-Max Weighted Edge
Reduction Game
Codeforces Round 462 (Div. 1) B. A Determined Cleanup
Educational Codeforces Round 38 (Rated for Div. 2) D. Buy a Ticket
Codeforces Round 466 (Div. 2) E. Cashback
April Fools Contest 2018 E. Cheese Board
Educational Codeforces Round 40 (Rated for Div. 2) E. Water Taps
Development Cost
Shift the letters
Count the permutations