chore(day23): solution for day23 pt1/pt2 #22

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xuu wants to merge 1 commits from day23 into main
9 changed files with 568 additions and 10 deletions

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day23/example.txt Normal file
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day23/input.txt Normal file
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#####...#.....#.#...#.....#.....#.......#.#...#.#...#...#...>.>.#.###.#.....###.#.###.#.###...#.......#...#.#.#.......#.#...#.#.....#...#...#
#############.#.#####.#########.#######.#.###.#.###.#.#.#.#####.#.###.#####.###.#.###.#.###.#########.#.###.#.#.#####.#.#.###.#######.#.###.#
#.............#...#...#...#.....#.......#.#...#...#.#.#.#.....#.#.#...#.....#...#...#.#...#.....#.....#...#.#.#.....#.#.#...#.#.......#.....#
#.###############.#.###.#.#.#####.#######.#.#####.#.#.#.#####.#.#.#.###.#####.#####.#.###.#####.#.#######.#.#.#####.#.#.###.#.#.#############
#.................#.....#...#####.........#.......#...#.......#...#.....#####.......#.....#####...#######...#.......#...###...#.............#
###########################################################################################################################################.#

236
day23/main.go Normal file
View File

@ -0,0 +1,236 @@
package main
import (
"bufio"
_ "embed"
"fmt"
"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) {
var m aoc.Map[int16, rune]
start := Point{0, 0}
target := Point{0, 0}
var text string
for scan.Scan() {
text = scan.Text()
if start == target {
start[1] = int16(strings.IndexRune(text, '.'))
}
m = append(m, []rune(text))
}
target[0] = int16(len(m) - 1)
target[1] = int16(strings.IndexRune(text, '.'))
result := &result{}
result.valuePT1 = search(&graph{m: m, start: start, target: target, neighbors: part1nbs})
result.valuePT2 = search(&graph{m: m, start: start, target: target, neighbors: part2nbs})
return result, nil
}
type Point = aoc.Point[int16]
type Map = aoc.Map[int16, rune]
// diretion of path steps
type direction int8
var (
U = Point{-1, 0}
R = Point{0, 1}
D = Point{1, 0}
L = Point{0, -1}
)
var directions = []Point{U, R, D, L}
var dirIDX = func() map[Point]direction {
m := make(map[Point]direction, len(directions))
for k, v := range directions {
m[v] = direction(k)
}
return m
}()
var arrows = []rune{'^', '>', 'v', '<'}
var arrowIDX = func() map[rune]Point {
m := make(map[rune]Point, len(arrows))
for k, v := range arrows {
m[v] = directions[k]
}
return m
}()
// position on the map
type position struct {
loc Point
direction Point
}
func (p position) step(to Point) position {
return position{p.loc.Add(to), to}
}
// implements FindPath graph interface
type graph struct {
m Map
start Point
target Point
neighbors func(g *graph, current position) []position
}
// Neighbors returns valid steps from given position. if at target returns none.
func (g *graph) Neighbors(current position) []position {
return g.neighbors(g, current)
}
// Cost calculates heat cost to neighbor from map
func (g *graph) Cost(a, b position) int16 {
return 1
}
func (g *graph) Target(a position, c int16) bool {
return a.loc == g.target
}
func (g *graph) Seen(a position) position {
a.direction = Point{}
return a
}
func match[T comparable](match T, lis ...T) bool {
for _, b := range lis {
if b == match {
return true
}
}
return false
}
func search(g *graph) int {
costs, paths := aoc.FindPaths[int16, position](g, position{loc: g.start}, position{loc: g.target})
for i, path := range paths {
log("path length = ", costs[i])
printGraph(g.m, path)
}
return int(aoc.Max(0, costs...))
}
// printGraph with the path overlay
func printGraph(m Map, path []position) {
pts := make(map[Point]position, len(path))
for _, pt := range path {
pts[pt.loc] = pt
}
for r, row := range m {
for c, x := range row {
if _, ok := pts[Point{int16(r), int16(c)}]; ok {
if x == '.' {
fmt.Print("*")
} else {
fmt.Print(string(x))
}
continue
}
fmt.Print(".")
_ = x
// fmt.Print(string(x))
}
fmt.Println("")
}
fmt.Println("")
}
func opposite(d Point) Point {
return directions[(dirIDX[d]+2)%4]
}
func part1nbs(g *graph, current position) []position {
var nbs []position
if current.loc == g.start {
return []position{
{current.loc.Add(D), D},
}
}
if current.loc == g.target {
return nil
}
// only one direction on arrow.
_, r, _ := g.m.Get(current.loc)
if match(r, arrows...) {
to := arrowIDX[r]
if next := current.step(to); g.m.Valid(next.loc) {
_, r, _ := g.m.Get(next.loc)
d := arrows[(dirIDX[to]+2)%4] // flow from opposite direction
if !match(r, rune(d), '#') {
nbs = append(nbs, next)
}
}
return nbs
}
for _, to := range directions {
if next := current.step(to); g.m.Valid(next.loc) {
_, r, _ := g.m.Get(next.loc)
d := arrows[(dirIDX[to]+2)%4] // flow from opposite direction
if !match(r, rune(d), '#') {
nbs = append(nbs, next)
}
}
}
return nbs
}
func part2nbs(g *graph, current position) []position {
var nbs []position
if current.loc == g.start {
return []position{
{current.loc.Add(D), D},
}
}
if current.loc == g.target {
return nil
}
for _, to := range directions {
if next := current.step(to); g.m.Valid(next.loc) {
if next.direction == opposite(current.direction) {
continue
}
_, r, _ := g.m.Get(next.loc)
if r == '#' {
continue
}
nbs = append(nbs, next)
}
}
return nbs
}

42
day23/main_test.go Normal file
View File

@ -0,0 +1,42 @@
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, 94)
is.Equal(result.valuePT2, 154)
}
// 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.True(result.valuePT1 > 1918)
// is.Equal(result.valuePT1, 2074)
// is.Equal(result.valuePT2, 0)
// }

View File

@ -2,7 +2,9 @@ package aoc
import (
"cmp"
"fmt"
"sort"
"strings"
"golang.org/x/exp/maps"
)
@ -110,7 +112,7 @@ func (m *cmap[C, N]) String() string {
for k, nbs := range m.neighbors {
fmt.Fprintln(b, k)
for to, v := range nbs {
fmt.Fprintln(b, " ", to, k)
fmt.Fprintln(b, " ", to, v)
}
}
@ -130,19 +132,20 @@ func CompressMap[C number, N comparable](p pather[C, N], start N) pather[C, N] {
}
nbs := p.Neighbors(n)
if len(nbs) == 2 {
if len(nbs) == 2{
a, b := nbs[0], nbs[1]
if to, ok := visited[a]; ok {
to[b] = to[n] + p.Cost(n, b)
delete(to, n)
visited[a] = to
continue
} else if to, ok := visited[b]; ok {
to[a] = to[n] + p.Cost(n, a)
delete(to, n)
visited[b] = to
}
continue
}
}
visited[n] = make(map[N]C)
next = append(next, nbs...)

View File

@ -1,8 +1,6 @@
package aoc_test
import (
"fmt"
"sort"
"testing"
"github.com/matryer/is"
@ -27,7 +25,6 @@ func TestRepeat(t *testing.T) {
is.Equal(aoc.Repeat(5, 3), []int{5, 5, 5})
}
func TestTranspose(t *testing.T) {
is := is.New(t)

View File

@ -1,5 +1,11 @@
package aoc_test
import (
"testing"
"github.com/matryer/is"
aoc "go.sour.is/advent-of-code"
)
func TestLCM(t *testing.T) {
is := is.New(t)

103
search.go
View File

@ -1,6 +1,7 @@
package aoc
import (
"maps"
"math/bits"
"sort"
)
@ -322,3 +323,105 @@ func (h *fibHeap[T]) cascadingCut(y *fibTree[T]) {
h.cascadingCut(y.parent)
}
}
// FindPath uses the A* path finding algorithem.
// g is the graph source that implements the pather interface.
//
// C is an numeric type for calculating cost/potential
// N is the node values. is comparable for storing in visited table for pruning.
//
// start, end are nodes that dileniate the start and end of the search path.
// The returned values are the calculated cost and the path taken from start to end.
func FindPaths[C integer, N comparable](g pather[C, N], start, end N) ([]C, [][]N) {
var zero C
// closed := make(map[N]bool)
var potentialFn = func(N) C { var zero C; return zero }
if p, ok := g.(interface{ Potential(N) C }); ok {
potentialFn = p.Potential
}
type node struct {
cost C
potential C
parent *node
position N
closed map[N]bool
}
NewPath := func(n *node) []N {
var path []N
for n.parent != nil {
path = append(path, n.position)
n = n.parent
}
path = append(path, n.position)
Reverse(path)
return path
}
less := func(b, a *node) bool {
return b.cost+b.potential < a.cost+a.potential
}
pq := PriorityQueue(less)
pq.Insert(&node{position: start, closed: make(map[N]bool)})
defer func() {
Log("queue max depth = ", pq.maxDepth, "total enqueue = ", pq.totalEnqueue, "total dequeue = ", pq.totalDequeue)
}()
var seenFn = func(a N) N { return a }
if s, ok := g.(interface{ Seen(N) N }); ok {
seenFn = s.Seen
}
var targetFn = func(n N, c C) bool { return true }
if s, ok := g.(interface{ Target(N, C) bool }); ok {
targetFn = s.Target
}
var paths [][]N
var costs []C
for !pq.IsEmpty() {
current := pq.ExtractMin()
cost, potential, n := current.cost, current.potential, current.position
seen := seenFn(n)
if current.closed[seen] {
continue
}
current.closed[seen] = true
if cost > 0 && potential == zero && cost > Max(0, costs...) && targetFn(current.position, cost) {
paths = append([][]N(nil), NewPath(current))
costs = append([]C(nil), cost)
Log("new record = ", cost)
continue
}
for _, nb := range g.Neighbors(n) {
seen := seenFn(nb)
if current.closed[seen] {
continue
}
cost := g.Cost(n, nb) + current.cost
next := &node{
position: nb,
parent: current,
cost: cost,
potential: potentialFn(nb),
closed: maps.Clone(current.closed),
}
// check if path is in open list
if _, open := current.closed[seen]; !open {
next.closed[seen] = false // add to open list
pq.Insert(next)
}
}
}
return costs, paths
}

View File

@ -1,5 +1,12 @@
package aoc_test
import (
"sort"
"testing"
"github.com/matryer/is"
aoc "go.sour.is/advent-of-code"
)
func TestSet(t *testing.T) {
is := is.New(t)