How should I practice Roman to Integer?

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Roman to Integer

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Problem statement

Given the canonical uppercase Roman-numeral representation of an integer from 1 through 3999, return its integer value.

The subtractive pairs are IV, IX, XL, XC, CD, and CM.

Function

romanToInteger(roman: String) → int

Examples

Example 1

roman = "III"return = 3

The signed local contribution of each symbol reproduces canonical additive and subtractive notation.

Example 2

roman = "IV"return = 4

The signed local contribution of each symbol reproduces canonical additive and subtractive notation.

Example 3

roman = "IX"return = 9

The signed local contribution of each symbol reproduces canonical additive and subtractive notation.

Constraints

1 <= roman.length <= 15.
roman is the canonical uppercase representation of a value from 1 through 3999.

Problem statement

Function

Examples

Example 1

Example 2

Example 3

Constraints

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