https://atcoder.jp/contests/abc175 過去問。 A: Rainy Season puts gets.chomp.each_char.chunk {|e| e == "R"} .map {|b, ary| b ? ary.size : 0}.max B: Making Triangle n = gets.to_i ls = gets.split.map(&:to_i) puts ls.combination(3).count {|li,…