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

enkoi

https://paiza.jp/poh/enkoi

Ruby / CoffeeScript

enkoi_q1.coffee

process.stdin.resume()
process.stdin.setEncoding 'utf-8'

process.stdin.on 'data', (chunk) ->
  lines = chunk.toString().split('\n')
  size = parseInt lines.shift()
  all = 0
  for n in lines[0..(size-1)]
    all += parseInt n
  console.log all

enkoi_q1.rb

size = gets.to_i
all = 0
size.times do
  all += gets.to_i
end
puts all

enkoi_q2.coffee

process.stdin.resume()
process.stdin.setEncoding 'utf-8'

process.stdin.on 'data', (chunk) ->
  lines = chunk.toString().split('\n')
  size = parseInt lines.shift()
  all = 0
  for l in lines[0..(size-1)]
    ds = l.toString().split(' ')
    need = (parseInt ds[0]) - (parseInt ds[1])
    continue if need <= 0
    all += (parseInt ds[2]) * need
  console.log all

enkoi_q2.rb

size = gets.to_i
all = 0
size.times do
  ds = gets.split(' ').map(&:to_i)
  need = ds[0] - ds[1]
  next if need <= 0
  all += ds[2] * need
end
puts all

enkoi_q3.coffee

# テストは通るのにTaseCase4でエラー

process.stdin.resume()
process.stdin.setEncoding 'utf-8'

process.stdin.on 'data', (chunk) ->
  lines = chunk.toString().split('\n')
  ps = lines.shift().toString().split(' ')
  size = parseInt ps[0]
  len = parseInt ps[1]
  now = 0
  buf = []

  for l in lines[0..(size-1)]
    num = parseInt l
    now += num
    buf.push num
  max = now

  for l in lines[size..len-1]
    num = parseInt l
    now += (num - buf.shift())
    max = now if now > max
    buf.push num

  console.log max

enkoi_q3.rb

size, len = gets.split(' ').map(&:to_i)
now = 0
buf = []
size.times do
  num = gets.to_i
  now += num
  buf << num
end
max = now

(len-size).times do
  num = gets.to_i
  now += (num - buf.shift)
  max = now if now > max
  buf << num
end
puts max

rev:172707 => https://paiza.jp/poh/enkoi-ending/19d94a16

rev:eb5597 => https://paiza.jp/poh/enkoi-ending/290aaac9
TestCase7 : 0.43s => OK

rev:3b0955 => https://paiza.jp/poh/enkoi-ending/9e0466d1
いらない変数を削ったけど、誤差の範囲