https://atcoder.jp/contests/abc184 A: Determinant a, b, c, d = readlines.join.split.map(&:to_i) puts a * d - b * c B: Quizzes n, x = gets.split.map(&:to_i) str = gets.chomp str.each_char do |s| case s when "o" x += 1 else x -= 1 if x.nonze…

オフラインリアルタイムどう書くの 会場や問題のリスト - 鍋あり谷あり ポーカー https://qiita.com/Nabetani/items/cbc3af152ee3f50a822f Suit = %W(S H D C) Rank = %W(2 3 4 5 6 7 8 9 10 J Q K A) def cards Suit.flat_map {|s| Rank.map {|r| s + r} }.…

https://atcoder.jp/contests/abc179 A: Plural Form str = gets.chomp puts str + (str[-1] == "s" ? "es" : "s") B: Go to Jail n = gets.to_i dice = n.times.map {gets.split.map(&:to_i)} f = dice.each_cons(3).any? {|d1, d2, d3| d1[0] == d1[1] && …

https://atcoder.jp/contests/abc181 A: Heavy Rotation n = gets.to_i puts n.even? ? "White" : "Black" B: Trapezoid Sum n = gets.to_i abs = n.times.map {gets.split.map(&:to_i)} puts abs.map {|a, b| (b - a + 1) * (a + b) / 2}.sum C: Collineari…