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Roman to Integer

Understand how to convert Roman numeral strings into integer values by using hash maps to efficiently map symbols to numbers. Explore the special subtraction rules in Roman numerals and implement a solution that handles both addition and subtraction cases accurately.

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,  ...