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ROMAN = [ | ||
(1000, "M"), | ||
(900, "CM"), | ||
(500, "D"), | ||
(400, "CD"), | ||
(100, "C"), | ||
(90, "XC"), | ||
(50, "L"), | ||
(40, "XL"), | ||
(10, "X"), | ||
(9, "IX"), | ||
(5, "V"), | ||
(4, "IV"), | ||
(1, "I"), | ||
] | ||
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def roman_to_int(roman: str) -> int: | ||
""" | ||
LeetCode No. 13 Roman to Integer | ||
Given a roman numeral, convert it to an integer. | ||
Input is guaranteed to be within the range from 1 to 3999. | ||
https://en.wikipedia.org/wiki/Roman_numerals | ||
>>> tests = {"III": 3, "CLIV": 154, "MIX": 1009, "MMD": 2500, "MMMCMXCIX": 3999} | ||
>>> all(roman_to_int(key) == value for key, value in tests.items()) | ||
True | ||
""" | ||
vals = {"I": 1, "V": 5, "X": 10, "L": 50, "C": 100, "D": 500, "M": 1000} | ||
total = 0 | ||
place = 0 | ||
while place < len(roman): | ||
if (place + 1 < len(roman)) and (vals[roman[place]] < vals[roman[place + 1]]): | ||
total += vals[roman[place + 1]] - vals[roman[place]] | ||
place += 2 | ||
else: | ||
total += vals[roman[place]] | ||
place += 1 | ||
return total | ||
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def int_to_roman(number: int) -> str: | ||
""" | ||
Given a integer, convert it to an roman numeral. | ||
https://en.wikipedia.org/wiki/Roman_numerals | ||
>>> tests = {"III": 3, "CLIV": 154, "MIX": 1009, "MMD": 2500, "MMMCMXCIX": 3999} | ||
>>> all(int_to_roman(value) == key for key, value in tests.items()) | ||
True | ||
""" | ||
result = [] | ||
for arabic, roman in ROMAN: | ||
(factor, number) = divmod(number, arabic) | ||
result.append(roman * factor) | ||
if number == 0: | ||
break | ||
return "".join(result) | ||
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if __name__ == "__main__": | ||
import doctest | ||
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doctest.testmod() |