Codeforces 333 Div2

cf333-div2-a-two-base.rb

n, bx = gets.chomp.split(" ").map(&:to_i)
xs = gets.chomp.split(" ").map(&:to_i)
m, by = gets.chomp.split(" ").map(&:to_i)
ys = gets.chomp.split(" ").map(&:to_i)

bxx = (0..(n-1)).map{|i| bx**i}.reverse
byy = (0..(m-1)).map{|i| by**i}.reverse

x = xs.zip(bxx).map{|i, j| i*j}.inject(:+)
y = ys.zip(byy).map{|i, j| i*j}.inject(:+)

if x == y then
  puts "="
elsif x < y then
  puts "<"
else
  puts ">"
end

cf333-div2-b-Approximating-a-Constant-Range.rb

# 14462223
n = gets.chomp.to_i
a = gets.chomp.split(" ").map(&:to_i)

left = 0
prev = 0
ans = 1
tmp = 0
(1...n).each do |i|
  d = a[i] - a[i-1]
  if d != 0 then
    if d == tmp then
      left = prev + 1
    end
    tmp = d
    prev = i - 1
  end
  ans = [ans, i - left + 1].max
end
puts ans

Codeforces Round #333 — editorial - Codeforces

• A
• B
• C
• D
• E