Code festival 2018 qual B; B

code-festival-2018-qualb-b.rb

n, x = gets.chomp.split(" ").map(&:to_i)
ab = []
ans = 0
abmax = [0, 0]
n.times do
  a, b = gets.chomp.split(" ").map(&:to_i)
  ab << [a, b]
  ans += a * b
  if b > abmax[1]
    abmax = [a, b]
  elsif b == abmax[1]
    if a > abmax[0]
      abmax = [a, b]
    end
  end
end

puts ans - abmax[0] * abmax[1] + (abmax[0] + x) * abmax[1]