feat: add day 6 2024

2025-07-06 09:20:16 -06:00 · 2025-07-06 09:20:16 -06:00 · aa84e3974b
commit aa84e3974b
parent aa0a2b7b7d
5 changed files with 344 additions and 0 deletions
--- a/aoc2024/day06/example.txt
+++ b/aoc2024/day06/example.txt
@ -0,0 +1,10 @@
+....#.....
+.........#
+..........
+..#.......
+.......#..
+..........
+.#..^.....
+........#.
+#.........
+......#...
--- a/aoc2024/day06/input.txt
+++ b/aoc2024/day06/input.txt
@ -0,0 +1,130 @@
+........#........................................#......#........#................................................................
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+#..........................#..#..............#.......#..........................#.................................................
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+.......#..................##.......#...#.#...#...................................#.......................................#.....#..
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--- a/aoc2024/day06/main.go
+++ b/aoc2024/day06/main.go
@ -0,0 +1,147 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+
+	var start aoc.Point[int]
+	var m [][]rune
+
+	for scan.Scan() {
+		txt := scan.Text()
+
+		if txt == "" {
+			continue
+		}
+
+		m = append(m, []rune(txt))
+
+		for i, c := range txt {
+			if c == '^' {
+				start = aoc.Point[int]{len(m) - 1, i}
+			}
+		}
+	}
+
+	sum, positions, _ := runPT1(m, start)
+
+	loops := runPT2(m, start, positions)
+
+	return &result{sum, loops}, nil
+}
+
+func isOutOfBounds(p, topRight, bottomLeft aoc.Point[int]) bool {
+	return p[0] < topRight[0] ||
+		p[0] > bottomLeft[0] ||
+		p[1] < topRight[1] ||
+		p[1] > bottomLeft[1]
+}
+
+func printMap(m [][]rune, o aoc.Point[int]) {
+	for i, row := range m {
+		if i == o[0] {
+			row[o[1]] = 'O'
+		} 
+		println(string(row))
+	}
+	println()
+}
+
+func runPT1(m [][]rune, start aoc.Point[int]) (int, []aoc.Point[int], bool) {
+	m = copyMap(m)
+
+	topRight := aoc.Point[int]{0, 0}
+	bottomLeft := aoc.Point[int]{len(m) - 1, len(m[0]) - 1}
+
+	directions := []aoc.Point[int]{
+		{-1, 0}, // up
+		{0, 1},  // right
+		{1, 0},  // down
+		{0, -1}, // left
+	}
+
+	d := 0
+	current := start
+	var loopStart [3]int
+	var paths = aoc.NewSet[[3]int]()
+	for !isOutOfBounds(current, topRight, bottomLeft) {
+		m[current[0]][current[1]] = 'X'
+		next := current.Add(directions[d])
+		if isOutOfBounds(next, topRight, bottomLeft) {
+			break
+		}
+		if m[next[0]][next[1]] == '#' {
+			d = (d + 1) % 4
+			pt := [3]int{current[0], current[1], d}
+			if paths.Has(pt) {
+				if loopStart == pt {
+					return 0, nil, true
+				}
+				if loopStart == [3]int{} {
+					loopStart = pt					
+				}
+			}
+
+			paths.Add(pt)
+			continue
+		}
+		
+		current = next
+	}
+
+	var sum int
+	var points []aoc.Point[int]
+	for y, row := range m {
+		for x, v := range row {
+			if v == 'X' {
+				points = append(points, aoc.Point[int]{x, y})
+				sum++
+			}
+		}
+	}
+
+	return sum, points, false
+}
+
+func runPT2(m [][]rune, start aoc.Point[int], points []aoc.Point[int]) int {
+	sum := 0
+	for _, p := range points {
+		cm := copyMap(m)
+		cm[p[0]][p[1]] = '#'
+
+		_, _, isOOB :=runPT1(cm, start)
+
+		if !isOOB {
+			printMap(cm, start)
+			sum++
+		}
+	}
+
+	return sum
+}
+
+func copyMap(m [][]rune) [][]rune {
+	newM := make([][]rune, len(m))
+	for i, row := range m {
+		newM[i] = make([]rune, len(row))
+		copy(newM[i], row)
+	}
+	return newM
+}
--- a/aoc2024/day06/main_test.go
+++ b/aoc2024/day06/main_test.go
@ -0,0 +1,43 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 41)
+	is.Equal(result.valuePT2, 6)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 5329)
+	is.True(result.valuePT2 > 897)
+	is.Equal(result.valuePT2, 0)
+}
+
--- a/grids_test.go
+++ b/grids_test.go
@ -73,3 +73,17 @@ func toList[T any](seq iter.Seq[T]) []T {
 	}
 	return list
 }
+
+func TestGraphBFS2(t *testing.T) {
+	is := is.New(t)
+
+	var adjacencyList = map[int][]int{
+		1: {2, 3},
+		2: {4},
+		3: {5, 6},
+	}
+
+	g := aoc.Graph(aoc.WithAdjacencyList[int](adjacencyList))
+	is.Equal(toList(g.BFS(1)), []int{1, 2, 3, 4, 5, 6})
+
+}