solved roman to integer

Author: rezairfanwijaya

roman-to-integer/roman_to_integer.go

@@ -0,0 +1,43 @@
+package romantointeger
+
+import (
+	"strings"
+)
+
+func RomanToInt(s string) int {
+	romanInt := 0
+
+	// uppercase input
+	stringUpperCases := strings.ToUpper(s)
+
+	// symbol romawi
+	symbol := map[byte]int{
+		'I': 1,
+		'V': 5,
+		'X': 10,
+		'L': 50,
+		'C': 100,
+		'D': 500,
+		'M': 1000,
+	}
+
+	// loop stringUpperCase and match with symbol
+	index := 0
+	for index < len(stringUpperCases) {
+		if index+1 < len(stringUpperCases) {
+			if symbol[stringUpperCases[index]] < symbol[stringUpperCases[index+1]] {
+				romanInt += symbol[stringUpperCases[index+1]] - symbol[stringUpperCases[index]]
+				index += 2
+				continue
+			} else {
+				romanInt += symbol[stringUpperCases[index]]
+			}
+		} else {
+			romanInt += symbol[stringUpperCases[index]]
+		}
+
+		index += 1
+	}
+
+	return romanInt
+}

roman-to-integer/roman_to_integer_test.go

@@ -0,0 +1,47 @@
+package romantointeger_test
+
+import (
+	rti "letcode/roman-to-integer"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRomanToInt(t *testing.T) {
+	testCases := []struct {
+		Name        string
+		Symbol      string
+		Expectation int
+	}{
+		{
+			Name:        "Test 1",
+			Symbol:      "III",
+			Expectation: 3,
+		}, {
+			Name:        "Test 2",
+			Symbol:      "LVIII",
+			Expectation: 58,
+		}, {
+			Name:        "Test 3",
+			Symbol:      "MCMXCIV",
+			Expectation: 1994,
+		}, {
+			Name:        "Test 4",
+			Symbol:      "mcmxciv",
+			Expectation: 1994,
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.Name, func(t *testing.T) {
+			actual := rti.RomanToInt(testCase.Symbol)
+			assert.Equal(t, testCase.Expectation, actual)
+		})
+	}
+}
+
+func BenchmarkRomanToInt(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		rti.RomanToInt("III")
+	}
+}