day 02 - first thing completely from nvim

02/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func readFile(p string) string {
+	if cont, err := os.ReadFile(p); err != nil {
+		panic(err)
+	} else {
+		return strings.TrimSpace(string(cont))
+	}
+}
+
+func parseInt(s string) int {
+	if i, err := strconv.Atoi(s); err != nil {
+		panic(err)
+	} else {
+		return i
+	}
+}
+
+func main() {
+	// data := readFile("test")
+	data := readFile("input")
+
+	idSum := 0
+
+	for rr := range strings.SplitSeq(data, ",") {
+		parts := strings.Split(rr, "-")
+
+		from := parseInt(parts[0])
+		to := parseInt(parts[1])
+
+		idMap := map[string]bool{}
+
+		for number := from; number <= to; number++ {
+			candidate := strconv.Itoa(number)
+
+			numLen := len(candidate)
+
+			for testParts := 2; testParts <= numLen; testParts++ {
+				if numLen%testParts == 0 {
+					sliceLen := numLen / testParts
+
+					ref := candidate[:sliceLen]
+
+					isCode := true
+
+					for testPartIndex := 1; testPartIndex < testParts; testPartIndex++ {
+						if candidate[sliceLen*testPartIndex:sliceLen*(testPartIndex+1)] != ref {
+							isCode = false
+
+							break
+						}
+					}
+
+					if isCode && !idMap[candidate] {
+						idMap[candidate] = true
+						idSum += number
+
+						fmt.Println(number)
+					}
+				}
+			}
+		}
+
+	}
+
+	fmt.Println(idSum)
+}