Day 2 done

.vscode/launch.json

@@ -0,0 +1,7 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": []
+}

cmd/02/main.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"aoc2024/internal/common"
+	"aoc2024/internal/day02"
+)
+
+func main() {
+	input := common.LoadInputs("02_1.txt")
+	result1, result2 := day02.Handle(input)
+	println(result1)
+	println(result2)
+}

internal/common/common.go

@@ -17,7 +17,7 @@ func Must[T any](obj T, err error) T {
 
 func LoadInputs(input string) []string {
 	fmt.Println("Opening file...")
-	bytes := Must(os.ReadFile("././inputs/" + input))
+	bytes := Must(os.ReadFile("/home/g3po/Projects/advent_of_code_2024/inputs/" + input))
 	content := strings.Split(string(bytes), "\n")
 	return content[:len(content)-1]
 }

internal/day02/handler.go

@@ -0,0 +1,83 @@
+package day02
+
+import (
+	"strings"
+
+	"aoc2024/internal/common"
+)
+
+type Difference int
+
+const (
+	None Difference = iota
+	Positive
+	Negative
+)
+
+func (d Difference) IsTransitionOk(diff Difference) bool {
+	if d == None && diff != None {
+		return true
+	}
+	if d == diff && d != None {
+		return true
+	}
+	return false
+}
+
+func Handle(input []string) (int, int) {
+	safe := 0
+	dampened := 0
+	for _, line := range input {
+		levels := strings.Split(line, " ")
+
+		if isSafe(levels) {
+			safe++
+			dampened++
+		} else if isSafeWithDeletion(levels) {
+			dampened++
+		}
+	}
+	return safe, dampened
+}
+
+func getTrend(diff int) Difference {
+	if diff >= 1 && diff <= 3 {
+		return Positive
+	}
+	if diff <= -1 && diff >= -3 {
+		return Negative
+	}
+	return None
+}
+
+func isSafe(row []string) bool {
+	trend := None
+	for i := 0; i < len(row)-1; i++ {
+		diff := common.StrToInt(row[i]) - common.StrToInt(row[i+1])
+		newTrend := getTrend(diff)
+
+		if !trend.IsTransitionOk(newTrend) {
+			return false
+
+		}
+		trend = newTrend
+	}
+	return true
+}
+
+func isSafeWithDeletion(row []string) bool {
+	safe := false
+	for i := range row {
+		copyRow := make([]string, len(row))
+		copy(copyRow, row)
+		if i == len(row)-1 {
+			safe = isSafe(copyRow[:i])
+		} else {
+			safe = isSafe(append(copyRow[:i], copyRow[i+1:]...))
+		}
+		if safe {
+			return safe
+		}
+	}
+	return false
+}