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Roman to Integer

Explore how to convert a Roman numeral string into its integer equivalent using hash maps. Understand the subtraction cases that alter normal addition and implement a solution to handle Roman numerals up to 3999 correctly.

Statement

Given a string, s, representing a Roman numeral, return the integer value of the Roman numeral.

Seven different symbols represent Roman numerals:

Symbol

Value

I

1

V

5

X

10

L

50

C

100

D

500

M

1000

So, in Roman numerals,  ...