Roman Numeral Parsing | Dataford Interview Questions

Write code to convert a string of Roman numerals into an integer (for example, MCMLXII -> 1962).

Implement roman_to_integer(s), which accepts a valid, canonical Roman numeral string and returns its integer value. Handle subtractive pairs such as IV, IX, XL, XC, CD, and CM.

The input represents a value from 1 through 3999 and uses only I, V, X, L, C, D, and M.

Constraints

1 <= len(s) <= 15
s contains only the characters I, V, X, L, C, D, and M
s is a valid canonical Roman numeral
1 <= result <= 3999

Function Signature

def roman_to_integer(s):

Your question is Roman Numeral Parsing. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem