AtCoder ABC #064

abc064-a.rb

r, g, b = gets.chomp.split(" ").map(&:to_i)
n = r * 100 + g * 10 + b
if n % 4 == 0 then
  puts "YES"
else
  puts "NO"
end

abc064-b.rb

n = gets.chomp.to_i
a = gets.chomp.split(" ").map(&:to_i).sort
puts a.last - a[0]

abc064-c.rb

n = gets.chomp.to_i
a = gets.chomp.split(" ").map(&:to_i)
h = Hash.new(0)
anyc = 0
a.each do |aa|
  if aa < 3200
    c = aa / 400
    h[c] += 1
  else
    anyc += 1
  end
end


cmin = [h.keys.length, 1].max

cmax = h.keys.length + anyc

puts [cmin, cmax].join(" ")

abc064-d.rb

n = gets.chomp.to_i
s = gets.chomp.split("")
paren = 0
append_first = 0
append_last = 0
s.each do |i|
  if i == "(" then
    paren += 1
  else
    paren -= 1
    if paren < 0 then
      paren = 0
      append_first += 1
    end
  end
end
append_last = paren

puts "(" * append_first + s.join("") + ")" * append_last