AtCoderで初見で出来なかった問題一覧
D - RGB Triplets
D - Knight
D - Match or Not
D - Sum of Large Numbers
D - Multiple of 2019
D - Teleporter
D - Div Game
D - Not Divisible
D - Sum of Divisors
(C++なら解ける解き方ができたがRubyで通すにはさらに工夫が必要)
D - Chat in a Circle
D - Moving Piece
D - Range Add Query
D - Handstand
D - Step Up Robot
D - Marking
D - Flip Cards
atcoder