From 65eafb1d56cb106f095c8527e11a41c139a8326d Mon Sep 17 00:00:00 2001
From: Mika Suhonen <mikas@mikas.net>
Date: Wed, 4 Dec 2024 18:16:50 +0200
Subject: [PATCH] p1

---
 2024/04/go.mod  |   3 ++
 2024/04/main.go | 108 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100644 2024/04/go.mod
 create mode 100644 2024/04/main.go

diff --git a/2024/04/go.mod b/2024/04/go.mod
new file mode 100644
index 0000000..3a3a5a6
--- /dev/null
+++ b/2024/04/go.mod
@@ -0,0 +1,3 @@
+module main
+
+go 1.23.3
diff --git a/2024/04/main.go b/2024/04/main.go
new file mode 100644
index 0000000..e0e1edf
--- /dev/null
+++ b/2024/04/main.go
@@ -0,0 +1,108 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+
+	lines, err := parse()
+	if err != nil {
+		fmt.Println("Error:", err)
+	}
+
+	var p1 int = 0
+	var p2 int = 0
+
+	h := len(lines)
+	w := len(lines[0])
+
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+
+			if lines[y][x] == 'X' {
+				// check right
+				if x <= len(lines[y])-4 {
+					r := string([]byte{lines[y][x+1], lines[y][x+2], lines[y][x+3]})
+					if r == "MAS" {
+						p1++
+					}
+				}
+
+				// check left
+				if x >= 3 {
+					l := string([]byte{lines[y][x-1], lines[y][x-2], lines[y][x-3]})
+					if l == "MAS" {
+						p1++
+					}
+				}
+
+				// check if up possible
+				if y >= 3 {
+					u := string([]byte{lines[y-1][x], lines[y-2][x], lines[y-3][x]})
+					if u == "MAS" {
+						p1++
+					}
+					if x >= 3 {
+						ul := string([]byte{lines[y-1][x-1], lines[y-2][x-2], lines[y-3][x-3]})
+						if ul == "MAS" {
+							p1++
+						}
+					}
+					if x < w-3 {
+						ur := string([]byte{lines[y-1][x+1], lines[y-2][x+2], lines[y-3][x+3]})
+						if ur == "MAS" {
+							p1++
+						}
+					}
+
+				}
+
+				// check down
+				if y <= h-4 {
+					d := string([]byte{lines[y+1][x], lines[y+2][x], lines[y+3][x]})
+					if d == "MAS" {
+						p1++
+					}
+					if x >= 3 {
+						dl := string([]byte{lines[y+1][x-1], lines[y+2][x-2], lines[y+3][x-3]})
+						if dl == "MAS" {
+							p1++
+						}
+					}
+					if x < w-3 {
+						dr := string([]byte{lines[y+1][x+1], lines[y+2][x+2], lines[y+3][x+3]})
+						if dr == "MAS" {
+							p1++
+						}
+					}
+				}
+			}
+		}
+	}
+
+	fmt.Println("p1: ", p1)
+	fmt.Println("p2: ", p2)
+}
+
+func parse() ([]string, error) {
+	if len(os.Args) < 2 {
+		return nil, fmt.Errorf("no file provided")
+	}
+	filePath := os.Args[1]
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return nil, fmt.Errorf("error opening file: %v", err)
+	}
+	chunks := strings.Split(string(data), "\n")
+	var nonEmpthyChunks = []string{}
+
+	for _, chunk := range chunks {
+		if chunk != "" {
+			nonEmpthyChunks = append(nonEmpthyChunks, chunk)
+		}
+	}
+	return nonEmpthyChunks, nil
+}