Roman to Integer

Easy

stringhash-tablemath

Convert a Roman numeral to an integer. Symbols: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. A smaller symbol before a larger one subtracts (IV=4, IX=9, XL=40, XC=90, CD=400, CM=900).

Input: one line, the Roman numeral. Output: the integer value.

Example 1

Input:

III

Output:

Example 2

Input:

LVIII

Output:

Example 3

Input:

MCMXCIV

Output:

M + CM + XC + IV.

Constraints

1 ≤ length ≤ 15
Valid Roman numeral in [1, 3999].

Watch a video walkthrough

Run your code against the sample tests, or Submit to run the full suite.

Problems

Roman to Integer

Easy

stringhash-tablemath

Convert a Roman numeral to an integer. Symbols: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. A smaller symbol before a larger one subtracts (IV=4, IX=9, XL=40, XC=90, CD=400, CM=900).

Input: one line, the Roman numeral. Output: the integer value.

Example 1

Input:

III

Output:

Example 2

Input:

LVIII

Output:

Example 3

Input:

MCMXCIV

Output:

M + CM + XC + IV.

Constraints

1 ≤ length ≤ 15
Valid Roman numeral in [1, 3999].

Watch a video walkthrough

Run your code against the sample tests, or Submit to run the full suite.