From b9928789dfe115a9f7dc2f7a5088f320c803422a Mon Sep 17 00:00:00 2001
From: Kharec <sandro@cazzaniga.fr>
Date: Tue, 2 Dec 2025 23:12:11 +0100
Subject: [PATCH] feat: solve day10 using traditionnal look and say

---
 internal/2015/DayTen/code.go | 45 ++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 internal/2015/DayTen/code.go

diff --git a/internal/2015/DayTen/code.go b/internal/2015/DayTen/code.go
new file mode 100644
index 0000000..92c2fc0
--- /dev/null
+++ b/internal/2015/DayTen/code.go
@@ -0,0 +1,45 @@
+package dayten
+
+import (
+	"os"
+	"strconv"
+	"strings"
+
+	"advent-of-code/internal/registry"
+)
+
+func init() {
+	registry.Register("2015D10", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) string {
+	content, _ := os.ReadFile(filepath)
+	return string(content)
+}
+
+func applyLookAndSay(data string, iterations int) int {
+	for range iterations {
+		var result strings.Builder
+		idx := 0
+		for idx < len(data) {
+			digit := data[idx]
+			count := 1
+			for idx+count < len(data) && data[idx+count] == digit {
+				count++
+			}
+			result.WriteString(strconv.Itoa(count))
+			result.WriteByte(digit)
+			idx += count
+		}
+		data = result.String()
+	}
+	return len(data)
+}
+
+func PartOne(data string) int {
+	return applyLookAndSay(data, 40)
+}
+
+func PartTwo(data string) int {
+	return applyLookAndSay(data, 50)
+}