25 lines
754 B
Elixir
25 lines
754 B
Elixir
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defmodule Solution do
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@spec int_to_roman(num :: integer) :: String.t()
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def int_to_roman(num) do
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thousands = div(num, 1000)
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hundreds = div(rem(num, 1000), 100)
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tens = div(rem(num, 100), 10)
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String.duplicate("M", thousands) <>
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to_roman(hundreds, "C", "D", "M") <>
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to_roman(tens, "X", "L", "C") <>
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to_roman(rem(num, 10), "I", "V", "X")
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end
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@spec to_roman(num :: integer, one :: String.t(), five :: String.t(), ten :: String.t()) ::
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String.t()
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defp to_roman(num, one, five, ten) do
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case num do
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x when x <= 3 -> String.duplicate(one, x)
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x when x == 4 -> one <> five
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x when x > 4 and x <= 8 -> five <> String.duplicate(one, x - 5)
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x when x > 8 -> one <> ten
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end
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end
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end
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