https://atcoder.jp/contests/abc180 A: box n, a, b = gets.split.map(&:to_i) puts n - a + b B: Various distances gets xs = gets.split.map(&:to_i) puts xs.map {_1.abs}.sum puts Math.sqrt(xs.map {_1 * _1}.sum) puts xs.map {_1.abs}.max C: Cream…