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xuu:day6
xuu:working2024D3
xuu:hackerrank
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xuu:graphs
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aoc2024/day06/example.txt
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aoc2024/day06/input.txt
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147
aoc2024/day06/main.go
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@ -1,147 +0,0 @@
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
}

43
aoc2024/day06/main_test.go
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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)
}

14
grids_test.go
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@ -73,17 +73,3 @@ 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})
}