LeetCode13.go

package main

import "fmt"

func romanToInt(s string) int {
	romanMap := map[byte]int{'O': 0, 'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}
	sum := 0
	s = s + "O"
	for i := 0; i < len(s)-1; i++ {
		t2 := romanMap[s[i+1]]
		t1 := romanMap[s[i]]
		if t2 > t1 {
			sum = sum + (t2 - t1)
			i++
		} else {
			sum = sum + t1
		}
		t1 = t2
	}
	return sum
}

func main() {
	fmt.Println(romanToInt("MCMXCIV"))
}