day10/main.go

@@ -113,8 +113,7 @@ func (m *Path) readLine(text string) {
 }
 func (m *Path) buildPath() int {
 	m.start()
-	for m.next() {
+	for m.next() {}
-	}
 	return (len(m.p) + 1) / 2
 }
 func (m *Path) start() {
@@ -178,23 +177,15 @@ func (m *Path) next() bool {
 		last := n.whence
 		next := m.head.left.whence
 
-		switch (last<<4)|next {
+		switch last<<4|next {
-		case 0x11, 0x22: m.n.value = '|' // UP UP, DN DN
+		case UP<<4|UP, DN<<4|DN: m.head.value = '|' // UP UP, DN DN
+		case LF<<4|LF, RT<<4|RT: m.head.value = '-' // LF LF, RT RT
 
-		case 0x13: m.head.value = 'J' // UP LF
+		case UP<<4|RT, LF<<4|DN: m.head.value = 'J' // UP RT, LT DN
-		case 0x14: m.head.value = 'L' // UP RT
+		case UP<<4|LF, RT<<4|DN: m.head.value = 'L' // UP RT, RT DN 
-
-		case 0x23: m.head.value = '7' // DN LF
-		case 0x24: m.head.value = 'F' // DN RT
-
-		case 0x33, 0x44: m.head.value = '-' // LF LF, RT RT
-
-		case 0x31: m.head.value = '7' // LF UP 
-		case 0x32: m.head.value = 'J' // LF DN 
-
-		case 0x41: m.head.value = 'F' // RT UP
-		case 0x42: m.head.value = 'L' // RT DN 
 
+		case DN<<4|RT, LF<<4|UP: m.head.value = '7' // DN LF, LF UP 
+		case RT<<4|UP, DN<<4|LF: m.head.value = 'F' // DN LF, RT UP
 		}
 
 		return false
@@ -210,7 +201,7 @@ const (
 	ST int8 = iota
 	UP
 	DN
-	LF
+	LF 
 	RT
 )
 
@@ -255,7 +246,6 @@ func (m *Path) peek(d int8) *node {
 		if any(r, 'J', '|', 'L', 'S') {
 			return &node{value: r, whence: UP, pos: p}
 		}
-
 	case LF:
 		x, y := toXY(m.n.pos, m.w)
 		if x == 0 {
@@ -267,7 +257,6 @@ func (m *Path) peek(d int8) *node {
 		if any(r, 'F', '-', 'L', 'S') {
 			return &node{value: r, whence: RT, pos: p}
 		}
-
 	case RT:
 		x, y := toXY(m.n.pos, m.w)
 		if x == m.w {
@@ -278,7 +267,6 @@ func (m *Path) peek(d int8) *node {
 		if any(r, '7', '-', 'J', 'S') {
 			return &node{value: r, whence: LF, pos: p}
 		}
-
 	}
 	return nil
 }

day11/example.txt

@@ -0,0 +1,10 @@
+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....

day11/input.txt

@@ -0,0 +1,140 @@
+..............................#.........................#.......................#..............................#.........................#..
+....#.....#...................................#.............................................................................................
+.....................................#..................................#...................................................................
+...................................................#....................................................................#...................
+...............................................................#..................#...............................#.........................
+...............#.......................................#...................................#.....#.......#.........................#........
+............................................................................................................................................
+............................................................................#...............................................................
+.......#.......................#....................#.......................................................................................
+........................#..................#....................................................................#...........................
+..#.......................................................#.........#....................#....................................#.............
+..............#...........................................................#..........................................................#......
+......................................#...........................................#..........................#..............................
+.....................................................#.........#..........................................................................#.
+#.......#....................................#.................................................#............................................
+..............................#.......................................#..............#....................#..........#......................
+....#...................................#...................................................................................................
+....................................................................................................#.......................................
+.....................#...........#...............................................#..................................................#.......
+...............................................#.........#..................................................#..................#............
+..........................................................................#...............#........................#........................
+.................#.......................................................................................................#..................
+......................................................................................#..................#..............................#...
+.............#...................................................................................#..........................................
+#...........................#..........#....................................................................................................
+.........#........................................................................#...............................#.........................
+.....................#.........................#.....................................................#....................#......#..........
+.....................................................................#......................................................................
+................................#.....................................................................................................#.....
+...............#..........................................#.................#................#..............................................
+....................................#...........................#...........................................#...............................
+.......#...................#................#.......................................#..............................#......................#.
+......................#.................................................#................................................#..................
+....................................................#......................................#............#...................................
+.............#........................#..........................................................#.............#............................
+...................#..............................................................#.........................................................
+.........................................................#..................#..........#....................................................
+........................#.....................#..............................................#.........................................#....
+.................................................................#.........................................#...................#............
+...................................................#........#.....................................#......................#..................
+.........#....................#.......#................................................................#............#.......................
+#.............................................................................#.....................................................#.......
+..................#.......#.................................................................................................................
+.............#........................................................#........................#................#..........#..............#.
+.....................................................#......................................................................................
+.......#...............#.................#......................#................#..........................................................
+...................................#.....................................................#............................#.....................
+............................................................................................................................................
+...............................#........................................#.........................#.........................................
+.....#.........#...............................#...................#.....................................................................#..
+............................................................................................................................................
+..........#......................................................................#..........................................................
+.........................................#.............................................#......#...................#...................#.....
+........................#.....#........................................................................#....................................
+...................................................#.....#...................#..............................................................
+....................................................................#...............#....................................#........#.........
+...........................#..............................................................#.................................................
+...#........................................#.........#.......................................................#..............#..............
+..........#....................................................#................#...........................................................
+..................................#..................................................................................#...............#......
+.................#..........................................................................................................................
+............................................................................................................................................
+............................#.............#................................#.........................#.....................#................
+.........#.........................................#............#.........................#............................................#....
+....#................................................................#.........................#..............#.............................
+...................#......................................#.................................................................................
+..............................#......#..............................................#..............#................#.......................
+.............................................................................#..............................................................
+.......#.........................................................................................................................#..........
+..............#............#....................#...................#............#.......#.................................#................
+................................#......................#................................................#.................................#.
+............................................................................................................................................
+.#......................#......................................#...............................................#............................
+........................................................................#............................#......................................
+..................................................#..........................#..........................................#.......#...........
+.........................................#..........................................#....................#..............................#...
+......#...............#.................................#...................................................................................
+....................................#.......................................................................................................
+...............................................................#................#........#.........................#..........#.............
+..#........#.....#..........#...................#...................................................#.......................................
+.......................................#...........................#...........................................#............................
+.............................................................................#..............................................................
+.......................#..................................#............#...............#.......#.....................................#......
+............................................................................................................................................
+............#.....#................................#...........#...................................................#............#...........
+...........................................#..............................................#.................................................
+..................................#..............................................#.....................#....................................
+..................................................................#.........................................................................
+...#..........................#............................................#................................................................
+.......................................................#..........................................#........#........#.......................
+.......................................#.................................................................................#......#...........
+.................................................#..........#.........#.......................#.............................................
+............................................................................................................................................
+....#...........#........................................................................................#.......#...........#..............
+......................#...........#.......#....................#..............#.....#.......................................................
+.........#...............................................................................#..................................................
+..................................................#.........................................................................................
+...................#......................................#...........................................#...........................#......#..
+.............#..........#.....................#....................#........................................................................
+...............................................................................#.....#.....#.................#......#.......................
+...#.........................#...................................................................#........................#.................
+............................................................................................................................................
+.......#.........#..........................................#...............................................................................
+.................................#..............................................................................................#...........
+........................................................................#..............#.......#..................#........................#
+.#...................................#......#......#........................................................................................
+............................................................................................................................................
+.............#................#............................................................#..............#.................................
+......#.....................................................#.......................#................#...............................#......
+...................#..............................................#.......................................................#.................
+....................................#.....................................#.................................................................
+........................................................................................................#.......#...........................
+....#.....................................#...............#...................#...............#.........................................#...
+.....................................................................................#......................................................
+....................................................#...........#......................................................#............#.......
+........................#...................................................................................#...............................
+............................................................................#.....#.........#......................#........................
+...#.....#.....#.......................#....................................................................................................
+............................................................................................................................................
+......................................................................#.....................................................................
+......................................................................................#............#..........................#.............
+.....#.............#.........................................................#................#.............................................
+..............................#..........#............#.....#...........................................................#.............#.....
+........................................................................#................#..................................................
+..................................................................................#.........................................................
+......................#.............#....................#........................................................#.........................
+.................#................................#.............#.............#.............................................................
+............................................................................................................................................
+...#..........................#.............#....................................................#.......#...............#.........#........
+........#...........#.................#..................................................................................................#..
+..............#.................................#.....#..........................................................#..........................
+...........................................................#......#.........................................................................
+............................#..................................................#.....................................#......................
+...................................................#.......................................#................................................
+.#................#................#...............................................#...........................................#.....#......
+.............#....................................................................................................#.........................
+.........................#...........................................#.....#......................#..........#..............................
+........................................#...................#...........................................#...................................
+...#......#............................................................................#....................................................
+...............................................#.......................................................................#....................

day11/main.go

@@ -0,0 +1,214 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"sort"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code-2023"
+)
+
+// 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)
+	}
+	// solution9 := m.expand(9).sumPaths()
+	// fmt.Println(solution9)
+
+	// solution99 := m.expand(99).sumPaths()
+	// fmt.Println(solution99)
+
+	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 := abs(cXY[0]-pXY[0])+abs(cXY[1]-pXY[1])
+			paths = append(paths, path)		
+		}
+	
+	}
+	return 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) []int    { return []int{i % w, i / w} }
+func abs(i int) int {
+	if i < 0 {
+		return -i
+	}
+	return i
+}
+func sum(arr ...int) int {
+	acc :=0
+	for _, a := range arr {
+		acc += a
+	}
+	return acc
+}

day11/main_test.go

@@ -0,0 +1,41 @@
+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)
+}

template/example.txt

@@ -0,0 +1,10 @@
+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....

template/main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+
+	aoc "go.sour.is/advent-of-code-2023"
+)
+
+// 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) {
+
+	for scan.Scan() {
+		_ = scan.Text()
+
+	}
+
+	return &result{}, nil
+}

template/main_test.go

@@ -0,0 +1,41 @@
+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, 0)
+	is.Equal(result.valuePT2, 0)
+}
+
+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, 0)
+	is.Equal(result.valuePT2, 0)
+}

tools.go

@@ -96,3 +96,100 @@ func ReadStringToInts(fields []string) []int {
 	}
 	return arr
 }
+
+type Node[T any] struct {
+	value T
+	pos   int
+	left  *Node[T]
+}
+
+func (n *Node[T]) add(a *Node[T]) *Node[T] {
+	if a == nil {
+		return n
+	}
+
+	if n == nil {
+		return a
+	}
+
+	n.left = a
+	return a
+}
+
+func (n *Node[T]) Value() (value T, ok bool) {
+	if n == nil {
+		return
+	}
+	return n.value, true
+}
+
+func (n *Node[T]) Position() int {
+	if n == nil {
+		return -1
+	}
+	return n.pos
+}
+func (n *Node[T]) SetPosition(i int) {
+	if n == nil {
+		return
+	}
+	n.pos = i
+}
+func (n *Node[T]) Next() *Node[T] {
+	if n == nil {
+		return nil
+	}
+	return n.left
+}
+
+func (n *Node[T]) String() string {
+	if n == nil {
+		return "EOL"
+	}
+	return fmt.Sprintf("node %v", n.value)
+}
+
+type List[T any] struct {
+	head *Node[T]
+	n    *Node[T]
+	p    map[int]*Node[T]
+}
+
+func NewList[T any](a *Node[T]) *List[T] {
+	lis := &List[T]{
+		head: a,
+		n:    a,
+		p:    make(map[int]*Node[T]),
+	}
+	lis.add(a)
+
+	return lis
+}
+func (l *List[T]) Add(value T, pos int) {
+	a := &Node[T]{value: value, pos: pos}
+	l.add(a)
+}
+func (l *List[T]) add(a *Node[T]) {
+	if l.head == nil {
+		l.head = a
+	}
+	if a == nil {
+		return
+	}
+
+	l.n = l.n.add(a)
+	l.p[a.pos] = a
+}
+func (l *List[T]) Get(pos int) *Node[T] {
+	return l.p[pos]
+}
+func(l *List[T]) GetN(pos ...int) []*Node[T] {
+	lis := make([]*Node[T], len(pos))
+	for i, p := range pos {
+		lis[i] = l.p[p]
+	}
+	return lis
+}
+func (l *List[T]) Head() *Node[T] {
+	return l.head
+}