feat(map): roman to int

Author: Insua

0013.roman-to-integer/main.go

@@ -0,0 +1,45 @@
+package main
+
+import "fmt"
+
+func romanToInt(s string) int {
+	m := map[string]int{
+		"M":  1000,
+		"CM": 900,
+		"D":  500,
+		"CD": 400,
+		"C":  100,
+		"XC": 90,
+		"L":  50,
+		"XL": 40,
+		"X":  10,
+		"IX": 9,
+		"V":  5,
+		"IV": 4,
+		"I":  1,
+	}
+	num := 0
+	for {
+		if len(s) == 0 {
+			break
+		}
+		ss := ""
+		if len(s) > 1 {
+			ss = s[0:2]
+		}
+		if ss == "CM" || ss == "CD" || ss == "XC" || ss == "XL" || ss == "IX" || ss == "IV" {
+			num += m[ss]
+			s = s[2:]
+		} else {
+			ss = s[0:1]
+			num += m[ss]
+			s = s[1:]
+		}
+	}
+	return num
+}
+
+func main() {
+	s := "IV"
+	fmt.Println(romanToInt(s))
+}