From f8d8916b60ee0073feaf39e60046d54be253ebb7 Mon Sep 17 00:00:00 2001
From: Kharec <sandro@cazzaniga.fr>
Date: Mon, 24 Nov 2025 21:24:48 +0100
Subject: [PATCH] feat: add main code

---
 2021/day01/main.go | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 2021/day01/main.go

diff --git a/2021/day01/main.go b/2021/day01/main.go
new file mode 100644
index 0000000..2562063
--- /dev/null
+++ b/2021/day01/main.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func parseInput(file string) []int {
+	content, err := os.ReadFile(file)
+	if err != nil {
+		log.Fatalf("Failed to read input file: %v", err)
+	}
+	var data []int
+	for line := range strings.SplitSeq(string(content), "\n") {
+		num, err := strconv.Atoi(line)
+		if err != nil {
+			log.Fatalf("Failed to convert string to int: %v", err)
+		}
+		data = append(data, num)
+	}
+	return data
+}
+
+func PartOne(data []int) int {
+	count := 0
+	for i := 1; i < len(data); i++ {
+		if data[i] > data[i-1] {
+			count++
+		}
+	}
+	return count
+}
+
+func PartTwo(data []int) int {
+	count := 0
+	for i := 3; i < len(data); i++ {
+		if data[i] > data[i-3] {
+			count++
+		}
+	}
+	return count
+}
+
+func main() {
+	data := parseInput("input.txt")
+	fmt.Println("Part 1:", PartOne(data))
+	fmt.Println("Part 2:", PartTwo(data))
+}