📘

Roman to Integer

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.

Input:

III

Output:

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 $1$ and there are no subtractive cases in the input, we simply add the values of the three Is together: $1 + 1 + 1 = 3$ .
The final output is the sum calculated in the previous step, which is $3$ .

Editor

Python 3.13.1

0/0

Run code to see test results.

📘