paiza online hackathon vol.4 Lite https://paiza.jp/poh/enkoi

poh_vol4_1.rb

# https://paiza.jp/poh/enkoi-second/a19c27e5
s = 0
gets
s += $_.to_i while gets
puts s

poh_vol4_2.rb

# https://paiza.jp/poh/enkoi-third/fa58b3c7
total = 0
gets
while gets
    t, s, pr = $_.split(/\s/).map(&:to_i)
    total += (t - s) * pr if t > s
end
puts total

poh_vol4_3.rb

# https://paiza.jp/poh/enkoi-ending/4cdd6477
t, _ = gets.split(/\s/).map(&:to_i)
a = []
a << $_.to_i while gets
s = [a[0]]
1.step(a.size - 1) { |i|
  s[i] = s[i - 1] + a[i]
}
max = s[t - 1]
t.step(a.size - 1) { |i|
  x = s[i] - s[i - t]
  max = x if max < x
}
puts max