mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-28 15:31:08 +00:00
28 lines
923 B
Python
28 lines
923 B
Python
|
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
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
import doctest
|
||
|
|
|
||
|
|
doctest.testmod()
|