Roman To Integer

Given a roman numeral, convert it to an integer.

Input is guaranteed to be within the range from 1 to 3999.

Read more details about roman numerals at Roman Numeric System

Example :

Input : "XIV"
Return : 14
Input : "XX"
Output : 20
NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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