ABC085C - Otoshidama

問題

https://atcoder.jp/contests/abs/tasks/abc085_c

回答1

defmodule Main do
  def main do
    :stdio
    |> IO.read(:all)
    |> solve()
    |> IO.puts()
  end

  defp split_words(words) do
    String.split(words, " ")
  end

  def solve(input) do
    [n, y] =
      input
      |> String.trim()
      |> split_words()
      |> Enum.map(&String.to_integer/1)

    t = div(y, 1000)

    for num_10000 <- 0..n,
        num_5000 <- 0..(n - num_10000),
        num_1000 = n - num_10000 - num_5000,
        num_10000 * 10 + num_5000 * 5 + num_1000 == t do
      "#{num_10000} #{num_5000} #{num_1000}"
    end
    |> Enum.at(0, "-1 -1 -1")
  end
end

"""
9 45000
"""
|> Main.solve()
|> then(&(&1 == "0 9 0"))

"""
20 196000
"""
|> Main.solve()
|> then(&(&1 == "-1 -1 -1"))

"""
1000 1234000
"""
|> Main.solve()
|> then(&(&1 == "2 54 944"))

"""
2000 20000000
"""
|> Main.solve()
|> then(&(&1 == "2000 0 0"))