How should I practice Parse a Valid Roman Numeral?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Motive phone screen problems in FastPrep.

Is Parse a Valid Roman Numeral associated with Motive?

FastPrep tags this as a Motive phone screen coding practice problem when the problem catalog has that company and stage context.

Parse a Valid Roman Numeral

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Problem statement

Given a string roman, return its integer value if it is the canonical uppercase Roman-numeral representation of a value from 1 through 3999. Return -1 otherwise.

Function

parseValidRoman(roman: String) → int

Examples

Example 1

roman = "MCMXCIV"return = 1994

Example 2

roman = "IIII"return = -1

Constraints

1 <= roman.length <= 20.
roman contains uppercase English letters.