Day 2 part 2

solutions/day02.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 )
 
-func checkPassword(input string) bool {
+func passwordPolicy1(input string) bool {
 	dashPosition := strings.Index(input, "-")
 	spacePosition := strings.Index(input, " ")
 	colonPosition := strings.Index(input, ":")
@@ -47,7 +47,7 @@ func Day02Part01(isTest bool) int {
 	correctPasswords := 0
 
 	for _, i := range values {
-		if checkPassword(i) {
+		if passwordPolicy1(i) {
 			correctPasswords += 1
 		}
 	}
@@ -55,6 +55,39 @@ func Day02Part01(isTest bool) int {
 	return correctPasswords
 }
 
-func Day02Part02(isTest bool) int {
-	return -1
+func passwordPolicy2(input string) bool {
+	dashPosition := strings.Index(input, "-")
+	spacePosition := strings.Index(input, " ")
+	colonPosition := strings.Index(input, ":")
+	firstIdx, err := strconv.Atoi(input[:dashPosition])
+	if err != nil {
+		panic("Error converting to int")
+	}
+	firstIdx -= 1
+	secondIdx, err := strconv.Atoi(input[dashPosition+1 : spacePosition])
+	if err != nil {
+		panic("Error converting to int")
+	}
+	secondIdx -= 1
+	letter := input[spacePosition+1 : colonPosition]
+	rest := input[colonPosition+2:]
+
+	firstIdxIsTrue := string(rest[firstIdx]) == letter
+	secondIdxIsTrue := string(rest[secondIdx]) == letter
+
+	return (firstIdxIsTrue && !secondIdxIsTrue) || (!firstIdxIsTrue && secondIdxIsTrue)
+}
+
+func Day02Part02(isTest bool) int {
+	input := ReadInput("02", isTest)
+	values := strings.Split(input, "\n")
+	correctPasswords := 0
+
+	for _, i := range values {
+		if passwordPolicy2(i) {
+			correctPasswords += 1
+		}
+	}
+
+	return correctPasswords
 }