Solution for https://paiza.jp/poh/enkoi

gistfile1.rb

# 1

puts (1..(gets.to_i)).map{gets.to_i}.reduce(0,:+)

#2

puts (1..(gets.to_i)).map{
    t,s,p = gets.split(' ').map{|s| s.to_i}
    t <= s ? 0 : (t-s)*p
}.reduce(0, :+)

# 3

mask_size, len = gets.split(" ").map{|s|s.to_i}
max = 0
arr=[]
sum = 0
(0..len-1).each{
	arr.push gets.to_i
	if arr.size==mask_size
		max = sum = arr.reduce(0, :+)
	elsif arr.size > mask_size
		sum = sum - arr.shift + arr.last
		max = [max, sum].max
	end
}
puts"#{max}"