chore(day23): solution for day23 pt1/pt2
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parent
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GPG Key ID:
8B3B0604F164E04F
23
day23/example.txt
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day23/example.txt
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#.#####################
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#.......#########...###
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#######.#########.#.###
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###.....#.>.>.###.#.###
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###v#####.#v#.###.#.###
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#####.#.#.#######.#.###
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#.....###...###...#...#
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#####################.#
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day23/input.txt
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day23/input.txt
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#.###########################################################################################################################################
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|
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###.#.#.#.###########.###########.#.#######.#####.#####.#####.###########.#.#.#.#.###.###.#.#.#.#.###.#.#.#####.#.###.#.###################.#
|
||||
#...#.#.#.#...........###...#.....#...#...#.....#.#.....#####.......#.....#...#.#...#.#...#...#...###...#.....#.#.###.#.#...#...#...........#
|
||||
#.###.#.#.#.#############.#.#.#######.#.#.#####.#.#.###############.#.#########.###.#.#.#####################.#.#.###.#.#.#.#.#.#.###########
|
||||
#...#.#.#.#.#...........#.#.#.#.....#.#.#.#.....#...#...............#...#...###.....#.#...#.................#.#.#.#...#...#.#.#.#.........###
|
||||
###.#.#.#.#.#.#########.#.#.#.#.###.#.#.#.#.#########.#################.#.#.#########.###.#.###############.#.#.#.#.#######.#.#.#########.###
|
||||
###.#.#.#.#.#.#.......#...#.#...#...#.#.#.#...#...#...#...#.......#...#...#.........#.....#...............#...#...#...#.....#.#.#...#...#...#
|
||||
###.#.#.#.#.#.#.#####.#####.#####.###.#.#.###.#.#.#.###.#.#.#####.#.#.#############.#####################.###########.#.#####.#.#.#.#v#.###.#
|
||||
###.#.#.#.#...#.....#.#...#.#...#.###...#.....#.#.#...#.#...#.....#.#.#.............###...#...#.....#...#.#.......#...#...#...#.#.#.>.#.....#
|
||||
###.#.#.#.#########.#.#.#.#.#.#.#.#############.#.###.#.#####.#####.#.#.###############.#.#.#.#.###.#.#.#.#.#####.#.#####.#.###.#.###v#######
|
||||
###...#...#.....#...#...#...#.#.#...........###.#.###...#.....###...#.#.......#.......#.#.#.#.#...#...#.#.#.....#...###...#...#...#...#...###
|
||||
###########.###.#.###########.#.###########.###.#.#######.#######.###.#######.#.#####.#.#.#.#.###.#####.#.#####.#######.#####.#####.###.#.###
|
||||
#.......###...#...#...###.....#.............#...#.......#.......#.#...#...#...#.#.....#.#.#.#.###.....#...#...#.......#.......#...#.....#...#
|
||||
#.#####.#####.#####.#.###.###################.#########.#######.#.#.###.#.#.###.#.#####.#.#.#.#######.#####.#.#######.#########.#.#########.#
|
||||
#.....#.......#...#.#...#.........#...###...#...#.......#...#...#.#...#.#...#...#.#...#.#.#.#.#...#...#...#.#.###...#...###.....#...........#
|
||||
#####.#########.#.#.###.#########v#.#.###.#.###.#.#######.#.#.###.###.#.#####.###.#.#.#.#.#.#.#.#.#.###.#.#.#.###.#.###.###.#################
|
||||
#.....#.......#.#.#.###...#...#.>.>.#...#.#.#...#...#.....#...###...#.#.....#.#...#.#.#.#.#.#.#.#.#...#.#.#.#.#...#.....#...#.....#.....#####
|
||||
#.#####.#####.#.#.#.#####.#.#.#.#######.#.#.#.#####.#.#############.#.#####v#.#.###.#.#.#.#.#.#.#.###v#.#.#.#.#.#########.###.###.#.###.#####
|
||||
#.....#.#.....#.#.#.#####.#.#...#.......#.#.#...#...#.........###...#.#...>.>.#.#...#.#.#...#.#.#...>.>.#.#.#.#.........#...#.#...#.###...###
|
||||
#####.#.#.#####.#.#.#####.#.#####.#######.#.###.#.###########v###.###.#.#######.#.###.#.#####.#.#########.#.#.#########.###.#.#.###.#####.###
|
||||
#####...#.....#.#...#.....#.....#.......#.#...#.#...#...#...>.>.#.###.#.....###.#.###.#.###...#.......#...#.#.#.......#.#...#.#.....#...#...#
|
||||
#############.#.#####.#########.#######.#.###.#.###.#.#.#.#####.#.###.#####.###.#.###.#.###.#########.#.###.#.#.#####.#.#.###.#######.#.###.#
|
||||
#.............#...#...#...#.....#.......#.#...#...#.#.#.#.....#.#.#...#.....#...#...#.#...#.....#.....#...#.#.#.....#.#.#...#.#.......#.....#
|
||||
#.###############.#.###.#.#.#####.#######.#.#####.#.#.#.#####.#.#.#.###.#####.#####.#.###.#####.#.#######.#.#.#####.#.#.###.#.#.#############
|
||||
#.................#.....#...#####.........#.......#...#.......#...#.....#####.......#.....#####...#######...#.......#...###...#.............#
|
||||
###########################################################################################################################################.#
|
||||
237
day23/main.go
Normal file
237
day23/main.go
Normal file
|
|
@ -0,0 +1,237 @@
|
|||
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
|
||||
}
|
||||
|
||||
// Potential calculates distance to target
|
||||
func (g *graph) Potential(a, b position) int16 {
|
||||
return aoc.ManhattanDistance(a.loc, b.loc)
|
||||
}
|
||||
|
||||
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
42
day23/main_test.go
Normal 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)
|
||||
// }
|
||||
Loading…
Reference in New Issue
Block a user