http://www.codeforces.com/contest/276 A, B問題だけ。 A. Lunch Rush n, k = gets.chomp.split(" ").map{ |e| e.to_i } ans = -10000000000 n.times do f, t = gets.chomp.split(" ").map{ |e| e.to_i } tmp = nil if t > k tmp = f - (t - k) else tmp = …

http://www.codeforces.com/contest/263 A, B問題だけ。 A. Beautiful Year require 'set' def is_disinct_digts(digits) set = Set.new digits return true if set.length == digits.length false end y = gets.chomp.to_i ans = nil for i in 1 .. 9000 do…