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28 lines
923 B
Python
28 lines
923 B
Python
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def roman_to_int(roman: str) -> int:
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"""
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LeetCode No. 13 Roman to Integer
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Given a roman numeral, convert it to an integer.
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Input is guaranteed to be within the range from 1 to 3999.
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https://en.wikipedia.org/wiki/Roman_numerals
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>>> tests = {"III": 3, "CLIV": 154, "MIX": 1009, "MMD": 2500, "MMMCMXCIX": 3999}
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>>> all(roman_to_int(key) == value for key, value in tests.items())
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True
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"""
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vals = {"I": 1, "V": 5, "X": 10, "L": 50, "C": 100, "D": 500, "M": 1000}
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total = 0
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place = 0
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while place < len(roman):
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if (place + 1 < len(roman)) and (vals[roman[place]] < vals[roman[place + 1]]):
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total += vals[roman[place + 1]] - vals[roman[place]]
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place += 2
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else:
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total += vals[roman[place]]
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place += 1
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return total
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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