p2

2024/02/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.23.3

2024/02/main.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const (
+	Increasing = 1
+	Decreasing = -1
+)
+
+func absInt(x int) int {
+	return absDiffInt(x, 0)
+}
+
+func absDiffInt(x, y int) int {
+	if x < y {
+		return y - x
+	}
+	return x - y
+}
+
+func checkDirection(x int) int {
+	switch {
+	case x < 0:
+		return Increasing
+	case x > 0:
+		return Decreasing
+	default:
+		return 0
+	}
+}
+
+func checklevel(report []int) bool {
+	dir := checkDirection(report[0] - report[1])
+	for i := 0; i < len(report)-1; i++ {
+		zero := report[i]
+		one := report[i+1]
+		diff := zero - one
+		if newDir := checkDirection(diff); newDir != dir {
+			return false
+		}
+		absDiff := absInt(diff)
+		if absDiff < 1 || absDiff > 3 {
+			return false
+		}
+	}
+	return true
+}
+
+func main() {
+
+	lines, err := parse()
+	if err != nil {
+		fmt.Println("Error:", err)
+	}
+
+	var safes = 0
+	var safes2 = 0
+
+	for _, line := range lines {
+		numbers := strings.Fields(line)
+		report := make([]int, len(numbers))
+		for i, num := range numbers {
+			x, err := strconv.Atoi(num)
+			if err != nil {
+				panic(err)
+			}
+			report[i] = x
+		}
+		if checklevel(report) {
+			safes++
+			safes2++
+		} else {
+			var checks = 0
+			for j := 0; j < len(report); j++ {
+				copyArray := make([]int, len(report))
+				copy(copyArray, report)
+				report2 := append(copyArray[:j], copyArray[j+1:]...)
+				if checklevel(report2) {
+					checks++
+				}
+			}
+			if checks >= 1 {
+				safes2++
+			}
+		}
+	}
+
+	fmt.Println("p1: ", safes)
+	fmt.Println("p2: ", safes2)
+}
+
+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
+}