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
+}

20201202/main_test.go

@@ -0,0 +1,47 @@
+package main
+
+import "testing"
+
+func TestRomaToDigit(t *testing.T) {
+	type args struct {
+		s string
+	}
+	tests := []struct {
+		name string
+		args args
+		want int
+	}{
+		{
+			"test1",
+			args{"III"},
+			3,
+		},
+		{
+			"test2",
+			args{"IV"},
+			4,
+		},
+		{
+			"test3",
+			args{"VI"},
+			6,
+		},
+		{
+			"test4",
+			args{"LVIII"},
+			58,
+		},
+		{
+			"test5",
+			args{"MCMXCIV"},
+			1994,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := RomaToDigit(tt.args.s); got != tt.want {
+				t.Errorf("RomaToDigit() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}