From 262d13478d43e3b8ac8582b2cc6ab32cd4e46f1b Mon Sep 17 00:00:00 2001
From: z1glr <z1glr@pm.me>
Date: Tue, 2 Dec 2025 21:08:26 +0100
Subject: [PATCH] day 02 - first thing completely from nvim

---
 02/go.mod  |  3 +++
 02/input   |  2 ++
 02/main.go | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 02/test    |  2 ++
 4 files changed, 81 insertions(+)
 create mode 100644 02/go.mod
 create mode 100644 02/input
 create mode 100644 02/main.go
 create mode 100644 02/test

diff --git a/02/go.mod b/02/go.mod
new file mode 100644
index 0000000..88ca325
--- /dev/null
+++ b/02/go.mod
@@ -0,0 +1,3 @@
+module git.z1glr.de/z1glr/advent-of-code-2025/02
+
+go 1.25.4
diff --git a/02/input b/02/input
new file mode 100644
index 0000000..aecde00
--- /dev/null
+++ b/02/input
@@ -0,0 +1,2 @@
+9595822750-9596086139,1957-2424,88663-137581,48152-65638,12354817-12385558,435647-489419,518494-609540,2459-3699,646671-688518,195-245,295420-352048,346-514,8686839668-8686892985,51798991-51835611,8766267-8977105,2-17,967351-995831,6184891-6331321,6161577722-6161678622,912862710-913019953,6550936-6625232,4767634976-4767662856,2122995-2257010,1194-1754,779-1160,22-38,4961-6948,39-53,102-120,169741-245433,92902394-92956787,531-721,64-101,15596-20965,774184-943987,8395-11781,30178-47948,94338815-94398813
+
diff --git a/02/main.go b/02/main.go
new file mode 100644
index 0000000..1fb83d2
--- /dev/null
+++ b/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)
+}
diff --git a/02/test b/02/test
new file mode 100644
index 0000000..871da5e
--- /dev/null
+++ b/02/test
@@ -0,0 +1,2 @@
+11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124
+