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Solution: Roman to Integer

Explore how to convert Roman numeral strings to integers by implementing an efficient hash map-based solution. Learn to handle additive and subtractive Roman numeral principles, traversing the string once for a clear and optimal approach.

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, 22 is written as II\text {II}, which is simply two ...