Reverse Roman Numerals
In this CheckiO mission
Roman Numerals
you have to convert a decimal
number into its representation as a Roman number.
Here you have to do the same but the other way around.
You are given a Roman number as a string and your job is to convert this number into its decimal representation.
A valid Roman number, in the context...
follow the rules of
the subtractive notation.
Check out this
for more details on how to form Roman numerals.
Input: A Roman number as a string.
Output: The decimal representation of the Roman number as an int.
Example:
reverse_roman('VI') == 6
reverse_roman('LXXVI') == 76
reverse_roman('CDXCIX') == 499
reverse_roman('MMMDCCCLXXXVIII') == 3888
Precondition:
len(roman_string) > 0
all(char in "MDCLXVI" for char in roman_string) == True
0 < reverse_roman(roman_string) < 4000
