20201202

20201202/main.go

@@ -0,0 +1,32 @@
+package main
+
+var r2d = map[uint8]int{
+	'I': 1,
+	'V': 5,
+	'X': 10,
+	'L': 50,
+	'C': 100,
+	'D': 500,
+	'M': 1000,
+}
+
+func main() {
+
+}
+
+func RomaToDigit(s string) int {
+	l := len(s)
+	ret := 0
+	for i := 0; i < l; i++ {
+		c := r2d[s[i]]
+		ret += c
+		if i >= l-1 {
+			break
+		}
+		cn := r2d[s[i+1]]
+		if cn > c {
+			ret -= 2 * c
+		}
+	}
+	return ret
+}