chore(aoc-2024): day2 part 1

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

Author: markkovari

2024/cmd/01.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 )
 
-func readFile(path string) ([]int64, []int64, error) {
+func read01File(path string) ([]int64, []int64, error) {
 	dat, err := os.ReadFile(path)
 	if err != nil {
 		return nil, nil, err

2024/cmd/01_test.go

@@ -2,8 +2,8 @@ package main
 
 import "testing"
 
-func TestExample(t *testing.T) {
-	left, right, err := readFile("../data/01/example")
+func Test01Example(t *testing.T) {
+	left, right, err := read01File("../data/01/example")
 	if err != nil {
 		t.Fatalf("Error reading file: %v", err)
 	}
@@ -15,8 +15,8 @@ func TestExample(t *testing.T) {
 	}
 }
 
-func TestExampleSecond(t *testing.T) {
-	left, right, err := readFile("../data/01/example")
+func Test01ExampleSecond(t *testing.T) {
+	left, right, err := read01File("../data/01/example")
 	if err != nil {
 		t.Fatalf("Error reading file: %v", err)
 	}
@@ -27,8 +27,8 @@ func TestExampleSecond(t *testing.T) {
 	}
 }
 
-func TestInput(t *testing.T) {
-	left, right, err := readFile("../data/01/input")
+func Test01Input(t *testing.T) {
+	left, right, err := read01File("../data/01/input")
 	if err != nil {
 		t.Fatalf("Error reading file: %v", err)
 	}
@@ -40,8 +40,8 @@ func TestInput(t *testing.T) {
 	}
 }
 
-func TestInputSecond(t *testing.T) {
-	left, right, err := readFile("../data/01/input")
+func Test01InputSecond(t *testing.T) {
+	left, right, err := read01File("../data/01/input")
 	if err != nil {
 		t.Fatalf("Error reading file: %v", err)
 	}

2024/cmd/02.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"math"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func read02File(path string) ([][]int, error) {
+	dat, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	lines := strings.Split(string(dat), "\n")
+	matrix := make([][]int, 0)
+
+	for _, line := range lines {
+		if line == "" {
+			continue
+		}
+		parts := strings.Fields(line)
+		row := make([]int, 0)
+		for _, part := range parts {
+			value, err := strconv.Atoi(part)
+			if err != nil {
+				continue
+			}
+			row = append(row, value)
+		}
+		matrix = append(matrix, row)
+	}
+	return matrix, nil
+}
+
+func countSafeLevels(levels [][]int) int {
+	count := 0
+	for _, row := range levels {
+		if isLevelSafe(row) {
+			count++
+		}
+	}
+	return count
+}
+
+func isLevelSafe(row []int) bool {
+	if len(row) < 3 {
+		return false
+	}
+	increasing := row[0] < row[1]
+	decreasing := !increasing
+	for j := 0; j < len(row)-1; j++ {
+		current, next := row[j], row[j+1]
+		difference := int(math.Abs(float64(current) - float64(next)))
+		if increasing && current > next {
+			return false
+		} else if decreasing && next > current {
+			return false
+		} else if difference > 3 || difference < 1 {
+			return false
+		}
+	}
+	return true
+}

2024/cmd/02_test.go

@@ -0,0 +1,25 @@
+package main
+
+import "testing"
+
+func Test02Example(t *testing.T) {
+	levels, err := read02File("../data/02/example")
+	if err != nil {
+		t.Fatalf("Error reading file: %v", err)
+	}
+	countSafe := countSafeLevels(levels)
+	if countSafe != 2 {
+		t.Fatalf("Expected 2 safe leves, got=%d", countSafe)
+	}
+}
+
+func Test02Input(t *testing.T) {
+	levels, err := read02File("../data/02/input")
+	if err != nil {
+		t.Fatalf("Error reading file: %v", err)
+	}
+	countSafe := countSafeLevels(levels)
+	if countSafe != 686 {
+		t.Fatalf("Expected 686 safe leves, got=%d", countSafe)
+	}
+}

2024/data/02/example

@@ -0,0 +1,6 @@
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9