Merge pull request #2 from StevanFreeborn/stevanfreeborn/feat/solve-day-one-part-two

feat: solve day one part two

README.md

@@ -20,17 +20,17 @@ Each day's solution is contained in a separate package.
 
 ## Challenges
 
-| Day | Problem                                         | Solution              | Notes                                  |
+| Day | Problem                                         | Solution              | Notes                                                                                                                                                             |
-|-----|-------------------------------------------------|-----------------------|----------------------------------------|
+|-----|-------------------------------------------------|-----------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| 01  | [Problem](https://adventofcode.com/2025/day/1)  | [Solution](./cmd/01/) | Part 1 seemed straight forward enough. |
+| 01  | [Problem](https://adventofcode.com/2025/day/1)  | [Solution](./cmd/01/) | Part 1 seemed straight forward enough. Part 2 completely stumped me. The trickiest part was not counting zero's twice when you ended and then started from there. |
-| 02  | [Problem](https://adventofcode.com/2025/day/2)  | [Solution](./cmd/02/) |                                        |
+| 02  | [Problem](https://adventofcode.com/2025/day/2)  | [Solution](./cmd/02/) |                                                                                                                                                                   |
-| 03  | [Problem](https://adventofcode.com/2025/day/3)  | [Solution](./cmd/03/) |                                        |
+| 03  | [Problem](https://adventofcode.com/2025/day/3)  | [Solution](./cmd/03/) |                                                                                                                                                                   |
-| 04  | [Problem](https://adventofcode.com/2025/day/4)  | [Solution](./cmd/04/) |                                        |
+| 04  | [Problem](https://adventofcode.com/2025/day/4)  | [Solution](./cmd/04/) |                                                                                                                                                                   |
-| 05  | [Problem](https://adventofcode.com/2025/day/5)  | [Solution](./cmd/05/) |                                        |
+| 05  | [Problem](https://adventofcode.com/2025/day/5)  | [Solution](./cmd/05/) |                                                                                                                                                                   |
-| 06  | [Problem](https://adventofcode.com/2025/day/6)  | [Solution](./cmd/06/) |                                        |
+| 06  | [Problem](https://adventofcode.com/2025/day/6)  | [Solution](./cmd/06/) |                                                                                                                                                                   |
-| 07  | [Problem](https://adventofcode.com/2025/day/7)  | [Solution](./cmd/07/) |                                        |
+| 07  | [Problem](https://adventofcode.com/2025/day/7)  | [Solution](./cmd/07/) |                                                                                                                                                                   |
-| 08  | [Problem](https://adventofcode.com/2025/day/8)  | [Solution](./cmd/08/) |                                        |
+| 08  | [Problem](https://adventofcode.com/2025/day/8)  | [Solution](./cmd/08/) |                                                                                                                                                                   |
-| 09  | [Problem](https://adventofcode.com/2025/day/9)  | [Solution](./cmd/09/) |                                        |
+| 09  | [Problem](https://adventofcode.com/2025/day/9)  | [Solution](./cmd/09/) |                                                                                                                                                                   |
-| 10  | [Problem](https://adventofcode.com/2025/day/10) | [Solution](./cmd/10/) |                                        |
+| 10  | [Problem](https://adventofcode.com/2025/day/10) | [Solution](./cmd/10/) |                                                                                                                                                                   |
-| 11  | [Problem](https://adventofcode.com/2025/day/11) | [Solution](./cmd/11/) |                                        |
+| 11  | [Problem](https://adventofcode.com/2025/day/11) | [Solution](./cmd/11/) |                                                                                                                                                                   |
-| 12  | [Problem](https://adventofcode.com/2025/day/12) | [Solution](./cmd/12/) |                                        |
+| 12  | [Problem](https://adventofcode.com/2025/day/12) | [Solution](./cmd/12/) |                                                                                                                                                                   |

cmd/01/dial/dial.go

@@ -7,42 +7,76 @@ import (
 )
 
 type Dial interface {
+	ZeroCount() int
 	Value() int
 	Turn(instruction instruction.Instruction)
 }
 
 type dial struct {
-	value int
+	zeroCount int
+	value     int
 }
 
 func New() Dial {
 	return &dial{
-		value: 50,
+		zeroCount: 0,
+		value:     50,
 	}
 }
 
+func From(value int) Dial {
+	return &dial{
+		zeroCount: 0,
+		value:     value,
+	}
+}
+
+func (d *dial) ZeroCount() int {
+	return d.zeroCount
+}
+
 func (d *dial) Value() int {
 	return d.value
 }
 
 func (d *dial) Turn(instruction instruction.Instruction) {
 	if instruction.Direction() == direction.Left {
-		d.value -= instruction.Distance()
+		for range instruction.Distance() {
+			d.decreaseOneClick()
 
-		for d.value < 0 {
+			if d.value == 0 {
-			d.value += 100
+				d.zeroCount++
+			}
+
+			if d.value < 0 {
+				d.value += 100
+			}
 		}
 
 		return
 	}
 
 	if instruction.Direction() == direction.Right {
-		d.value += instruction.Distance()
+		for range instruction.Distance() {
+			d.increaseOneClick()
 
-		for d.value > 99 {
+			if d.value >= 100 {
-			d.value -= 100
+				d.value -= 100
+			}
+
+			if d.value == 0 {
+				d.zeroCount++
+			}
 		}
 
 		return
 	}
 }
+
+func (d *dial) decreaseOneClick() {
+	d.value--
+}
+
+func (d *dial) increaseOneClick() {
+	d.value++
+}

cmd/01/dial/dial_test.go

@@ -16,6 +16,25 @@ func TestNew(t *testing.T) {
 	}
 }
 
+func TestProblem(t *testing.T) {
+	instructions := []instruction.Instruction{
+		instruction.FromLine("R48"),
+		instruction.FromLine("L5"),
+	}
+
+	dial := dial.From(52)
+
+	for _, i := range instructions {
+		dial.Turn(i)
+	}
+
+	result := dial.ZeroCount()
+
+	if result != 1 {
+		t.Errorf("ya done fucked up. you wanted %d but got %d", 1, result)
+	}
+}
+
 type TurnTestCase struct {
 	Instruction       instruction.Instruction
 	ExpectedDialValue int

cmd/01/main.go

@@ -26,3 +26,19 @@ func SolvePartOne(filePath string) int {
 
 	return total
 }
+
+func SolvePartTwo(filePath string) int {
+	lines := file.ReadLines(filePath)
+	dial := dial.New()
+
+	for _, line := range lines {
+		if line == "" {
+			continue
+		}
+
+		instruction := instruction.FromLine(line)
+		dial.Turn(instruction)
+	}
+
+	return dial.ZeroCount()
+}

cmd/01/main_test.go

@@ -25,3 +25,23 @@ func TestSolvePartOneWithInput(t *testing.T) {
 		t.Errorf(`SolvePartOne("INPUT.txt") = %d; want %d`, result, expected)
 	}
 }
+
+func TestSolvePartTwoWithExampleInput(t *testing.T) {
+	expected := 6
+
+	result := solution.SolvePartTwo("EXAMPLE.txt")
+
+	if result != expected {
+		t.Errorf(`SolvePartTwo("EXAMPLE.txt") = %d; want %d`, result, expected)
+	}
+}
+
+func TestSolvePartTwoWithInput(t *testing.T) {
+	expected := 5937
+
+	result := solution.SolvePartTwo("INPUT.txt")
+
+	if result != expected {
+		t.Errorf(`SolvePartTwo("INPUT.txt") = %d; want %d`, result, expected)
+	}
+}

internal/file/file.go

@@ -3,7 +3,6 @@ package file
 
 import (
 	"bufio"
-	"fmt"
 	"os"
 )
 
@@ -20,7 +19,6 @@ func ReadLines(filePath string) []string {
 
 	for hasLine := scanner.Scan(); hasLine; hasLine = scanner.Scan() {
 		line := scanner.Text()
-		fmt.Println(line)
 		lines = append(lines, line)
 	}