chore: setup folders for aoc 2024

aoc2023/day11/example.txt

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+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....

aoc2023/day11/input.txt

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aoc2023/day11/main.go

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+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"sort"
+	"strings"
+
+	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) {
+	m := NewMap()
+
+	for scan.Scan() {
+		text := scan.Text()
+		m.readLine(text)
+	}
+
+	return &result{
+		valuePT1: m.expand(1).sumPaths(),
+		valuePT2: m.expand(999_999).sumPaths(),
+	}, nil
+}
+
+type Map struct {
+	rows int
+	cols int
+
+	emptyRows map[int]bool
+	emptyCols map[int]bool
+
+	*aoc.List[rune]
+}
+
+func NewMap() *Map {
+	return &Map{
+		emptyRows: make(map[int]bool),
+		emptyCols: make(map[int]bool),
+		List:      aoc.NewList[rune](nil),
+	}
+}
+func (m *Map) String() string {
+	buf := &strings.Builder{}
+	fmt.Fprintf(buf, "Map size %d x %d\n", m.rows, m.cols)
+	fmt.Fprintln(buf, "empty rows:", all(m.emptyRows))
+	fmt.Fprintln(buf, "empty cols:", all(m.emptyCols))
+
+	n := m.Head()
+	for n != nil {
+		fmt.Fprintln(buf, toXY(n.Position(), m.cols), n.String())
+		n = n.Next()
+	}
+
+	for row := 0; row < m.rows; row++ {
+		for col := 0; col < m.cols; col++ {
+			if n := m.getRC(row, col); n != nil {
+				buf.WriteRune('#')
+			} else {
+				buf.WriteRune('.')
+			}
+		}
+		buf.WriteRune('\n')
+	}
+
+	return buf.String()
+}
+
+func (m *Map) readLine(text string) {
+	if m.cols == 0 {
+		m.cols = len(text)
+	}
+
+	emptyRow, ok := m.emptyRows[m.rows]
+	if !ok {
+		emptyRow = true
+	}
+
+	row := []rune(text)
+	for col, r := range row {
+		emptyCol, ok := m.emptyCols[col]
+		if !ok {
+			emptyCol = true
+		}
+
+		if r == '#' {
+			m.Add(r, fromXY(col, m.rows, m.cols))
+			emptyCol = false
+			emptyRow = false
+		}
+
+		m.emptyRows[m.rows] = emptyRow
+		m.emptyCols[col] = emptyCol
+	}
+
+	m.rows++
+}
+func (m *Map) getRC(row, col int) *aoc.Node[rune] {
+	return m.List.Get(fromXY(col, row, m.cols))
+}
+func (m *Map) expand(rate int) *Map {
+	newM := NewMap()
+
+	newM.rows = m.rows + rate*len(all(m.emptyRows))
+	newM.cols = m.cols + rate*len(all(m.emptyCols))
+
+	offsetC := 0
+	for col := 0; col < m.cols; col++ {
+		if empty, ok := m.emptyCols[col]; ok && empty {
+			for r := 0; r <= rate; r++ {
+				newM.emptyCols[offsetC+col+r] = true
+			}
+			offsetC += rate
+			continue
+		}
+	}
+
+	offsetR := 0
+	for row := 0; row < m.rows; row++ {
+		if empty, ok := m.emptyRows[row]; ok && empty {
+			for r := 0; r <= rate; r++ {
+				newM.emptyRows[offsetR+row+r] = true
+			}
+			offsetR += rate
+			continue
+		}
+
+		offsetC := 0
+		for col := 0; col < m.cols; col++ {
+			if empty, ok := m.emptyCols[col]; ok && empty {
+				offsetC += rate
+
+				continue
+			}
+
+			if n := m.getRC(row, col); n != nil {
+				newM.Add('#', fromXY(offsetC+col, offsetR+row, newM.cols))
+			}
+		}
+	}
+
+	return newM
+}
+func (m *Map) sumPaths() int {
+	var positions []int
+
+	n := m.Head()
+	for n != nil {
+		positions = append(positions, n.Position())
+		n = n.Next()
+	}
+
+	var paths []int
+
+	for i := 0; i < len(positions); i++ {
+		p := positions[i]
+		pXY := toXY(p, m.cols)
+
+		for j := i; j < len(positions); j++ {
+			c := positions[j]
+			if c == p {
+				continue
+			}
+
+			cXY := toXY(c, m.cols)
+
+			path := aoc.ABS(cXY[0]-pXY[0]) + aoc.ABS(cXY[1]-pXY[1])
+			paths = append(paths, path)
+		}
+	}
+	return aoc.Sum(paths...)
+}
+
+func all(m map[int]bool) []int {
+	lis := make([]int, 0, len(m))
+	for k, v := range m {
+		if v {
+			lis = append(lis, k)
+		}
+	}
+	sort.Ints(lis)
+	return lis
+}
+func fromXY(x, y, w int) int { return y*w + x }
+func toXY(i, w int) [2]int   { return [2]int{i % w, i / w} }

aoc2023/day11/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, 374)
+	is.Equal(result.valuePT2, 82000210)
+}
+
+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, 9627977)
+	is.Equal(result.valuePT2, 644248339497)
+}