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Roman to Integer

EasyMath & Design

Convert a Roman numeral string to an integer.

I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtractive: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900.

Example:

Input:
III
Output:
3
Reasoning:
  • The input string III is analyzed from left to right to determine the integer equivalent of each Roman numeral.
  • Since each I has a value of 11 and there are no subtractive cases in the input, we simply add the values of the three Is together: 1+1+1=31 + 1 + 1 = 3.
  • The final output is the sum calculated in the previous step, which is 33.

Constraints:

  • 1 <= len(s) <= 15
  • s is a valid Roman numeral in [1, 3999]
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Test Results

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