#92
Read Roman numerals
| Difficulty: | Hard |
| Topics: | strings math |
Roman numerals are easy to recognize, but not everyone knows all the rules necessary to work with them. Write a function to parse a Roman-numeral string and return the number it represents.
You can assume that the input will be well-formed, in upper-case, and follow the subtractive principle. You don't need to handle any numbers greater than MMMCMXCIX (3999), the largest number representable with ordinary letters.
You can assume that the input will be well-formed, in upper-case, and follow the subtractive principle. You don't need to handle any numbers greater than MMMCMXCIX (3999), the largest number representable with ordinary letters.
 | (= 14 (__ "XIV")) |
| (= 827 (__ "DCCCXXVII")) |
| (= 3999 (__ "MMMCMXCIX")) |
| (= 48 (__ "XLVIII")) |