From 2b548fa1efc952e04e33317e1f3e3650bc3b26ca Mon Sep 17 00:00:00 2001
From: Kharec <sandro@cazzaniga.fr>
Date: Thu, 4 Dec 2025 16:49:43 +0100
Subject: [PATCH] feat: solve part one with pruned bruteforce

---
 internal/2015/DayEleven/code.go | 89 +++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 internal/2015/DayEleven/code.go

diff --git a/internal/2015/DayEleven/code.go b/internal/2015/DayEleven/code.go
new file mode 100644
index 0000000..75b2eb6
--- /dev/null
+++ b/internal/2015/DayEleven/code.go
@@ -0,0 +1,89 @@
+package dayeleven
+
+import (
+	"os"
+
+	"advent-of-code/internal/registry"
+)
+
+func init() {
+	registry.Register("2015D11", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) string {
+	content, _ := os.ReadFile(filepath)
+	return string(content)
+}
+
+func PartOne(data string) int {
+	bytes := []byte(data)
+
+	increment := func() {
+		for idx := len(bytes) - 1; idx >= 0; idx-- {
+			if bytes[idx] == 'z' {
+				bytes[idx] = 'a'
+			} else {
+				bytes[idx]++
+				if bytes[idx] == 'i' || bytes[idx] == 'o' || bytes[idx] == 'l' {
+					bytes[idx]++
+				}
+				for j := idx + 1; j < len(bytes); j++ {
+					bytes[j] = 'a'
+				}
+				return
+			}
+		}
+	}
+
+	increment()
+
+	for {
+		forbiddenPosition := -1
+		for idx := range bytes {
+			if bytes[idx] == 'i' || bytes[idx] == 'o' || bytes[idx] == 'l' {
+				forbiddenPosition = idx
+				break
+			}
+		}
+
+		if forbiddenPosition != -1 {
+			bytes[forbiddenPosition]++
+			if bytes[forbiddenPosition] == 'i' || bytes[forbiddenPosition] == 'o' || bytes[forbiddenPosition] == 'l' {
+				bytes[forbiddenPosition]++
+			}
+			for j := forbiddenPosition + 1; j < len(bytes); j++ {
+				bytes[j] = 'a'
+			}
+			continue
+		}
+
+		hasStraight := false
+		for idx := 0; idx < len(bytes)-2; idx++ {
+			if bytes[idx+1] == bytes[idx]+1 && bytes[idx+2] == bytes[idx]+2 {
+				hasStraight = true
+				break
+			}
+		}
+
+		pairChars := make(map[byte]bool)
+		for idx := 0; idx < len(bytes)-1; idx++ {
+			if bytes[idx] == bytes[idx+1] {
+				pairChars[bytes[idx]] = true
+				idx++
+			}
+		}
+
+		if hasStraight && len(pairChars) >= 2 {
+			break
+		}
+
+		increment()
+	}
+
+	println(string(bytes))
+	return 0
+}
+
+func PartTwo(data string) int {
+	return 0
+}