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Roman to Integer

Understand how to convert Roman numeral strings into integers by leveraging hash maps. Discover the rules for typical and special subtraction cases, and implement an efficient solution to accurately interpret Roman numerals within valid constraints.

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,  ...