go

solutions/2/go/main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"strconv"
+	"strings"
+)
+
+type sRow struct {
+	min, max       int
+	char, password string
+}
+
+func parse(data []byte) []sRow {
+	parsed := []sRow{}
+	for _, row := range strings.Split(strings.TrimSpace(string(data)), "\n") {
+		s0 := strings.Split(row, ":")
+		rule := strings.TrimSpace(s0[0])
+		password := strings.TrimSpace(s0[1])
+		s1 := strings.Split(rule, " ")
+		minMax := strings.TrimSpace(s1[0])
+		char := strings.TrimSpace(s1[1])
+		s2 := strings.Split(minMax, "-")
+		min, _ := strconv.Atoi(strings.TrimSpace(s2[0]))
+		max, _ := strconv.Atoi(strings.TrimSpace(s2[1]))
+
+		r := sRow{
+			min:      min,
+			max:      max,
+			char:     char,
+			password: password,
+		}
+		parsed = append(parsed, r)
+	}
+	return parsed
+}
+
+func validSimple(rows []sRow) int {
+	valid := 0
+	for _, row := range rows {
+		count := strings.Count(row.password, row.char)
+		if row.min <= count && count <= row.max {
+			valid++
+		}
+	}
+	return valid
+}
+
+func validComplex(rows []sRow) int {
+	valid := 0
+	for _, row := range rows {
+		l := len(row.password)
+		min := row.min - 1
+		max := row.max - 1
+		if min >= l || max >= l {
+			continue
+		}
+		r := []rune(row.password)
+		a := string(r[min]) == row.char
+		b := string(r[max]) == row.char
+		if a != b {
+			valid++
+		}
+	}
+
+	return valid
+}
+
+func main() {
+	data, _ := ioutil.ReadFile("./solutions/2/data.txt")
+	rows := parse(data)
+	simple := validSimple(rows)
+	fmt.Println(simple)
+	complex := validComplex(rows)
+	fmt.Println(complex)
+}