Roman to Integer

ID: 13; easy

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Solution 1

var m = map[string]int{
    "I": 1,
    "V": 5,
    "X": 10,
    "L": 50,
    "C": 100,
    "D": 500,
    "M": 1000,
}

func romanToInt(s string) int {
    lastNum, result := 0, 0
    for i := len(s)-1; i >= 0; i-- {
        currLetter := s[i]
        currNum := m[string(currLetter)]
        if currNum >= lastNum {
            result += currNum
        } else {
            result -= currNum
        }
        lastNum = currNum
    }
    return result
}