chore(aoc-2024): day 01 part 1

Signed-off-by: Márk Kővári <kovarimarkofficial@gmail.com>

Author: markkovari

2024/cmd/01.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"math"
+	"os"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+func readFile(path string) ([]int64, []int64, error) {
+	dat, err := os.ReadFile(path)
+	if err != nil {
+		return nil, nil, err
+	}
+	lines := strings.Split(string(dat), "\n")
+	left := make([]int64, 0)
+	right := make([]int64, 0)
+	for _, line := range lines {
+		if line == "" {
+			continue
+		}
+		parts := strings.Fields(line)
+		leftAsNumber, err := strconv.ParseInt(parts[0], 10, 64)
+		if err != nil {
+			continue
+		}
+		rightAsNumber, err := strconv.ParseInt(parts[1], 10, 64)
+		if err != nil {
+			continue
+		}
+		left = append(left, int64(leftAsNumber))
+		right = append(right, int64(rightAsNumber))
+	}
+	return left, right, nil
+}
+
+func sortInput(left, right []int64) ([]int64, []int64) {
+	slices.Sort(left)
+	slices.Sort(right)
+	return left, right
+}
+
+func getDisances(left, right []int64) []int64 {
+	distances := make([]int64, 0)
+	for i := 0; i < len(left); i++ {
+		d := int64(math.Abs(float64(right[i] - left[i])))
+		distances = append(distances, d)
+	}
+	return distances
+}
+
+func sumDistances(distances []int64) int {
+	var sum int
+	for _, distance := range distances {
+		sum += int(distance)
+	}
+	return sum
+}

2024/cmd/01_test.go

@@ -0,0 +1,29 @@
+package main
+
+import "testing"
+
+func TestExample(t *testing.T) {
+	left, right, err := readFile("../data/01/example")
+	if err != nil {
+		t.Fatalf("Error reading file: %v", err)
+	}
+	left, right = sortInput(left, right)
+	distances := getDisances(left, right)
+	distanceSum := sumDistances(distances)
+	if distanceSum != 11 {
+		t.Fatalf("Expected 11, got %d", distanceSum)
+	}
+}
+
+func TestInput(t *testing.T) {
+	left, right, err := readFile("../data/01/input")
+	if err != nil {
+		t.Fatalf("Error reading file: %v", err)
+	}
+	left, right = sortInput(left, right)
+	distances := getDisances(left, right)
+	distanceSum := sumDistances(distances)
+	if distanceSum != 1970720 {
+		t.Fatalf("Expected 1970720, got %d", distanceSum)
+	}
+}

2024/data/01/example

@@ -0,0 +1,6 @@
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3