day1

2025/go/day01/day01.go

@@ -0,0 +1,128 @@
+package day01
+
+import (
+	"adventofcode2025/utils"
+	"fmt"
+	"strings"
+)
+
+type Dir int
+
+const (
+	Left Dir = iota
+	Right
+	Safe
+	Unsafe
+)
+
+type Instruction struct {
+	Turn  Dir
+	Steps int
+}
+
+func Part1(input string) int {
+	lines := strings.Split(input, "\n")
+	position := 50
+	code := 0
+	Instructions := make([]Instruction, 0)
+	for _, line := range lines {
+		var steps int
+		var dir Dir
+		switch line[0] {
+		case 'L':
+			steps = utils.MustAtoi(line[1:])
+			dir = Left
+		case 'R':
+			steps = utils.MustAtoi(line[1:])
+			dir = Right
+		default:
+			fmt.Println("Invalid direction")
+			continue
+		}
+		if steps > 100 {
+			steps = steps % 100
+		}
+		Instructions = append(Instructions, Instruction{Turn: dir, Steps: steps})
+	}
+	fmt.Print(Instructions)
+	for _, instr := range Instructions {
+		if instr.Turn == Left {
+			if position-instr.Steps < 0 {
+				position = 100 + (position - instr.Steps)
+			} else {
+				position -= instr.Steps
+			}
+		} else if instr.Turn == Right {
+			if position+instr.Steps >= 100 {
+				position = (position + instr.Steps) - 100
+			} else {
+				position += instr.Steps
+			}
+		}
+		fmt.Println("\n", instr.Turn, instr.Steps, "->", position)
+		if position == 0 {
+			code++
+		}
+	}
+	return code
+}
+
+func Part2(input string) int {
+	lines := strings.Split(input, "\n")
+	position := 50
+	code := 0
+	Instructions := make([]Instruction, 0)
+	for _, line := range lines {
+		var steps int
+		var dir Dir
+		switch line[0] {
+		case 'L':
+			steps = utils.MustAtoi(line[1:])
+			dir = Left
+		case 'R':
+			steps = utils.MustAtoi(line[1:])
+			dir = Right
+		default:
+			fmt.Println("Invalid direction")
+			continue
+		}
+		Instructions = append(Instructions, Instruction{Turn: dir, Steps: steps})
+	}
+	fmt.Print(Instructions)
+	for _, instr := range Instructions {
+		if instr.Steps > 100 {
+			code = code + (instr.Steps / 100)
+			instr.Steps = instr.Steps % 100
+		}
+		if instr.Turn == Left {
+			if position-instr.Steps < 0 {
+				if position != 0 {
+					code++
+				}
+				position = 100 + (position - instr.Steps)
+				
+			} else {
+				position -= instr.Steps
+				if position == 0 {
+					code++
+				}
+			}
+		} else if instr.Turn == Right {
+			if position+instr.Steps > 99 {
+				if position != 0 {
+					code++
+				}
+				position = (position + instr.Steps) - 100
+			} else {
+				position += instr.Steps
+				if position == 0 {
+					code++
+				}
+			}
+		}
+
+		fmt.Println("\n", instr.Turn, instr.Steps, "->", position, "code:", code)
+
+	}
+	return code
+}

2025/go/day01/day01_test.go

@@ -0,0 +1,34 @@
+package day01
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require")
+
+func TestPart1(t *testing.T) {
+	r := Part1(`L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82`)
+	require.Equal(t, 3, r)
+}
+
+func TestPart2(t *testing.T) {
+	r := Part2(`L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82`)
+	require.Equal(t, 6, r)
+}