Codeforces #337 Div2

cf337-div2-a-Pasha-and-Stick.rb

# [Problem - A - Codeforces](http://codeforces.com/contest/610/problem/A)
n = gets.chomp.to_i

if n.odd? then
  puts 0
else
  ab = n / 2
  if ab.odd? then
    puts (ab - 1) / 2
  else
    puts ab / 2 - 1
  end
end

cf337-div2-b-Vika-and-Squares.rb

# [Problem - B - Codeforces](http://codeforces.com/contest/610/problem/B)
n = gets.chomp.to_i
jars = gets.chomp.split(" ").map(&:to_i)
jarmin = jars.min
if jars.uniq.length == 1 then
  puts jars.length * jarmin
else
  jars = jars * 2
  rem = 0
  i = 0
  while true
    break if jars.empty?
    j = jars.shift
    if j == jarmin then
      rem = [rem, i].max
      i = 0
    else
      i += 1
    end
  end
  puts n * jarmin + [rem, i].max
end

Codeforces Round #337 (Div.2) Editorial - Codeforces