2023 Day 10 Complete!
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|
||||
LL.|JL7|L|7LJJ||LLL7||L7|FJ.L7F-J||L7|-F-JL7||JL-7LJF7L-7|L-7|F7F7|FJL-7L-7F7FJ|L7L7LJ||FJ|LJFJLJFJFJ|||FJ|F7|L-7FJ--|.7|F-J-JFJLF---LFJ7FJJ
|
||||
FJ7|FLF7|FL7LFFJ.F.LJ|FJLJJFFJL-7LJ|LJ-L-7FJLJF--JF7|L7FJ|F7||||||||F--JF-J||L7|FJFJF7|||FJF7L-7LL-JFJ||L7LJ|L-7|L7J.77J|7|.LF7J.L.LFLJ.FJL7
|
||||
|JLF7FFJJ--7F-|-..FLFJ|J...FJF--J|L7.LF-FJ|.LFJF--J||FJ|FJ|LJ||LJLJ|L-7FJF-J|FJ|L7|FJ|||||FJL-7|.F||L7|L-J|FJF7|L7L--77-|-FJ-FL7|J7.7|..|F7F
|
||||
|L|.|L7JJF|LF7J-J7|LL-JFJ-.|FJFJLL7L7-LFL7|.FL7|F--J||FJL7|-L|||J-LL7FJL7|F-JL7L7||L7||||LJJ.LLJ-FJ|LLJ7F--JFJ|L7L7F-JJ||L|L-|F|-.77F--.7.|7
|
||||
L7LFF-FJF-F7L|7LLJJ7LJJ|JFFLJJ|-LFLJJJ7L|LJJLFLJL7F7|LJJFLJ||LJ7.FLFJ|FLLJ|F7FJ-|||FJ||LJ|LL7|L7|L|J.F--JF-7|FJFJ||L-7F|.FL7.F-.J.LJJF|-J.||
|
||||
FF7.JJL-J7|7L-J7J7F||.F|.-F.|FJF--|77-LL7J|.FFF--J|||F7|F|7LJ-||F-7L-JFF--J||L-7|||L7LJ.|||.|7|-LFL.FJF--J.||L7L7FJF-J7J.|JLF--7.|L|.F|.FL|7
|
||||
----L7J7LFL77.L7-JJ|77FFJ-F7|FLJ7LF-L7|JL7L--F|F7FJ|LJL---7JLFLJJLL7F--JF7FJL7FJLJL-J7|7LF7F|JL-7|FFL-JJ7LL||L|FJ|FJJ|L7.7.F|7JJ-F--LJ.FFJLL
|
||||
L7L-7J-7F-7FL--JJ.LF.FFL-|L-|-JF7LLLJ|L--JJFFJLJLJ-|F-7F7FJ.L-7J|LLLL---J||7L||LL7F|J|LLJL|----L|||J7J-LJ.L||.|L7|||FFJFJ-|-7-----77L77|...|
|
||||
|F7JLJJF|--|||.J-7-J--7JFJ7.-7LJ77||-LFJ-7--||L|J7.|L7LJ||--J|F.|..|L|JF|LJ7L||-7LLJF7-L77L-J-77F|||7JFFFJ7LJ-L-JLJF-|F|F||..|-..F-7-||L----
|
||||
FJ||LLF-77.-|LF|-L.||LL.7JFL.F-L-7-L-.L.F-FJ.FFJJF-L-JJFJL7JFFL-|-L-7|.F7FJJ-LJ7L77.L-F-LL7JF--||LJJ--F-7L|JLLL-FJJF-|-F|-.-LL-77|.7.J-|..||
|
||||
FL--7.LLJ-JL7-FFJLF-J-|-F-7J-F.L|.|LJ---L-L7.-FJJL7JL..L--J-|L|.7--L|L-FJ|JJ-L.L-L-F-L|-LL7-JJ.LLFJ-|LLJLJ.JJLJ77J--.-.LL--JLJL|-LLJ7JL-J.-7
|
||||
|
|
@ -0,0 +1,168 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
|
||||
h "git.bullercodeworks.com/brian/adventofcode/helpers"
|
||||
)
|
||||
|
||||
func main() {
|
||||
inp := h.StdinToStringSlice()
|
||||
m, l := part1(inp)
|
||||
fmt.Println()
|
||||
part2(m, l)
|
||||
}
|
||||
|
||||
const (
|
||||
NS = '|'
|
||||
EW = '-'
|
||||
NE = 'L'
|
||||
NW = 'J'
|
||||
SW = '7'
|
||||
SE = 'F'
|
||||
|
||||
START = 'S'
|
||||
)
|
||||
|
||||
var pipes = []byte{NS, EW, NE, NW, SW, SE}
|
||||
|
||||
func part1(input []string) (h.CoordByteMap, []h.Coordinate) {
|
||||
m := h.StringSliceToCoordByteMap(input)
|
||||
_, loop := findLoop(&m)
|
||||
fmt.Println("# Part 1")
|
||||
fmt.Println(len(loop) / 2)
|
||||
return m, loop
|
||||
}
|
||||
|
||||
func part2(m h.CoordByteMap, loop []h.Coordinate) {
|
||||
var insideCoords []h.Coordinate
|
||||
var inside bool
|
||||
var enclosed int
|
||||
for y := m.TLY; y <= m.BRY; y++ {
|
||||
inside = false
|
||||
var rowPathStart byte
|
||||
for x := m.TLX; x <= m.BRX; x++ {
|
||||
wrk := h.Coordinate{X: x, Y: y}
|
||||
wrkV := m.Get(wrk)
|
||||
if h.CoordListContains(wrk, loop) { //&& (wrkV == NS || wrkV == NE || wrkV == NW) {
|
||||
// This coordinate is part of the loop, so it can change the 'inside' flag
|
||||
// A corner _only_ changes the flag if the 'exiting' corner continues in the same direction
|
||||
// i.e.: L--J doesn't change the flag, L--7 does change the flag
|
||||
switch wrkV {
|
||||
case NE, SE:
|
||||
rowPathStart = wrkV
|
||||
case NW, SW:
|
||||
if continues(rowPathStart, wrkV) {
|
||||
inside = !inside
|
||||
}
|
||||
}
|
||||
if wrkV == NS {
|
||||
// a | always changes the flag
|
||||
inside = !inside
|
||||
}
|
||||
} else {
|
||||
if inside {
|
||||
enclosed++
|
||||
insideCoords = append(insideCoords, wrk)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
fmt.Println("# Part 2")
|
||||
fmt.Println(enclosed)
|
||||
for _, insides := range insideCoords {
|
||||
m.Put(insides, 'I')
|
||||
}
|
||||
}
|
||||
|
||||
// continues checks if two _corner_ pieces continue the flow in the same direction
|
||||
func continues(p1, p2 byte) bool {
|
||||
switch p1 {
|
||||
case NE:
|
||||
return p2 == SW
|
||||
case NW:
|
||||
return p2 == SE
|
||||
case SW:
|
||||
return p2 == NE
|
||||
case SE:
|
||||
return p2 == NW
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func connectsNorth(v byte) bool {
|
||||
return v == START || v == NS || v == NE || v == NW
|
||||
}
|
||||
func connectsSouth(v byte) bool {
|
||||
return v == START || v == NS || v == SE || v == SW
|
||||
}
|
||||
func connectsEast(v byte) bool {
|
||||
return v == START || v == EW || v == NE || v == SE
|
||||
}
|
||||
func connectsWest(v byte) bool {
|
||||
return v == START || v == EW || v == NW || v == SW
|
||||
}
|
||||
|
||||
func connects(m *h.CoordByteMap, p1, p2 h.Coordinate) bool {
|
||||
p1v, p2v := m.Get(p1), m.Get(p2)
|
||||
switch {
|
||||
case p1.North().Equals(p2):
|
||||
return connectsNorth(p1v) && connectsSouth(p2v)
|
||||
case p1.East().Equals(p2):
|
||||
return connectsEast(p1v) && connectsWest(p2v)
|
||||
case p1.South().Equals(p2):
|
||||
return connectsSouth(p1v) && connectsNorth(p2v)
|
||||
case p1.West().Equals(p2):
|
||||
return connectsWest(p1v) && connectsEast(p2v)
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func countConnections(m *h.CoordByteMap, p h.Coordinate) int {
|
||||
var res int
|
||||
for _, tst := range []h.Coordinate{p.North(), p.East(), p.South(), p.West()} {
|
||||
if connects(m, p, tst) {
|
||||
res++
|
||||
}
|
||||
}
|
||||
return res
|
||||
}
|
||||
|
||||
// Find loop finds all coordinates on the loop and returns:
|
||||
// 1. The starting coordinate
|
||||
// 2. All coordinates on the loop
|
||||
// It also replaces the 'S' for the starting coordinate with the appropriate
|
||||
// pipe byte
|
||||
func findLoop(m *h.CoordByteMap) (h.Coordinate, []h.Coordinate) {
|
||||
start, _ := m.FindFirst(START)
|
||||
next := start
|
||||
path := []h.Coordinate{start}
|
||||
|
||||
// Figure out the starting pipe byte
|
||||
for _, v := range pipes {
|
||||
m.Put(start, v)
|
||||
if countConnections(m, start) == 2 {
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
for {
|
||||
for _, tst := range []h.Coordinate{
|
||||
next.North(),
|
||||
next.East(),
|
||||
next.South(),
|
||||
next.West(),
|
||||
} {
|
||||
if !connects(m, next, tst) || (!tst.Equals(start) && h.CoordListContains(tst, path)) {
|
||||
continue
|
||||
}
|
||||
next = tst
|
||||
}
|
||||
if next.Equals(start) {
|
||||
// We're done
|
||||
return start, path
|
||||
} else {
|
||||
path = append(path, next)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,310 @@
|
|||
[1]Advent of Code
|
||||
|
||||
• [2][About]
|
||||
• [3][Events]
|
||||
• [4][Shop]
|
||||
• [5][Settings]
|
||||
• [6][Log Out]
|
||||
|
||||
br0xen [7](AoC++) 20*
|
||||
|
||||
//[8]2023
|
||||
|
||||
• [9][Calendar]
|
||||
• [10][AoC++]
|
||||
• [11][Sponsors]
|
||||
• [12][Leaderboard]
|
||||
• [13][Stats]
|
||||
|
||||
Our [14]sponsors help make Advent of Code possible:
|
||||
[15]Kotlin by JetBrains - Jingle bells, Kotlin pals, coding all the way!
|
||||
Solve puzzles, catch our daily livestreams for expert guidance, embrace
|
||||
the joy of Kotlin, and engage with a fantastic community. Happy holidays
|
||||
and happy coding!
|
||||
|
||||
--- Day 10: Pipe Maze ---
|
||||
|
||||
You use the hang glider to ride the hot air from Desert Island all the way
|
||||
up to the floating metal island. This island is surprisingly cold and
|
||||
there definitely aren't any thermals to glide on, so you leave your hang
|
||||
glider behind.
|
||||
|
||||
You wander around for a while, but you don't find any people or animals.
|
||||
However, you do occasionally find signposts labeled "[16]Hot Springs"
|
||||
pointing in a seemingly consistent direction; maybe you can find someone
|
||||
at the hot springs and ask them where the desert-machine parts are made.
|
||||
|
||||
The landscape here is alien; even the flowers and trees are made of metal.
|
||||
As you stop to admire some metal grass, you notice something metallic
|
||||
scurry away in your peripheral vision and jump into a big pipe! It didn't
|
||||
look like any animal you've ever seen; if you want a better look, you'll
|
||||
need to get ahead of it.
|
||||
|
||||
Scanning the area, you discover that the entire field you're standing on
|
||||
is densely packed with pipes; it was hard to tell at first because they're
|
||||
the same metallic silver color as the "ground". You make a quick sketch of
|
||||
all of the surface pipes you can see (your puzzle input).
|
||||
|
||||
The pipes are arranged in a two-dimensional grid of tiles:
|
||||
|
||||
• | is a vertical pipe connecting north and south.
|
||||
• - is a horizontal pipe connecting east and west.
|
||||
• L is a 90-degree bend connecting north and east.
|
||||
• J is a 90-degree bend connecting north and west.
|
||||
• 7 is a 90-degree bend connecting south and west.
|
||||
• F is a 90-degree bend connecting south and east.
|
||||
• . is ground; there is no pipe in this tile.
|
||||
• S is the starting position of the animal; there is a pipe on this
|
||||
tile, but your sketch doesn't show what shape the pipe has.
|
||||
|
||||
Based on the acoustics of the animal's scurrying, you're confident the
|
||||
pipe that contains the animal is one large, continuous loop.
|
||||
|
||||
For example, here is a square loop of pipe:
|
||||
|
||||
.....
|
||||
.F-7.
|
||||
.|.|.
|
||||
.L-J.
|
||||
.....
|
||||
|
||||
If the animal had entered this loop in the northwest corner, the sketch
|
||||
would instead look like this:
|
||||
|
||||
.....
|
||||
.S-7.
|
||||
.|.|.
|
||||
.L-J.
|
||||
.....
|
||||
|
||||
In the above diagram, the S tile is still a 90-degree F bend: you can tell
|
||||
because of how the adjacent pipes connect to it.
|
||||
|
||||
Unfortunately, there are also many pipes that aren't connected to the
|
||||
loop! This sketch shows the same loop as above:
|
||||
|
||||
-L|F7
|
||||
7S-7|
|
||||
L|7||
|
||||
-L-J|
|
||||
L|-JF
|
||||
|
||||
In the above diagram, you can still figure out which pipes form the main
|
||||
loop: they're the ones connected to S, pipes those pipes connect to, pipes
|
||||
those pipes connect to, and so on. Every pipe in the main loop connects to
|
||||
its two neighbors (including S, which will have exactly two pipes
|
||||
connecting to it, and which is assumed to connect back to those two
|
||||
pipes).
|
||||
|
||||
Here is a sketch that contains a slightly more complex main loop:
|
||||
|
||||
..F7.
|
||||
.FJ|.
|
||||
SJ.L7
|
||||
|F--J
|
||||
LJ...
|
||||
|
||||
Here's the same example sketch with the extra, non-main-loop pipe tiles
|
||||
also shown:
|
||||
|
||||
7-F7-
|
||||
.FJ|7
|
||||
SJLL7
|
||||
|F--J
|
||||
LJ.LJ
|
||||
|
||||
If you want to get out ahead of the animal, you should find the tile in
|
||||
the loop that is farthest from the starting position. Because the animal
|
||||
is in the pipe, it doesn't make sense to measure this by direct distance.
|
||||
Instead, you need to find the tile that would take the longest number of
|
||||
steps along the loop to reach from the starting point - regardless of
|
||||
which way around the loop the animal went.
|
||||
|
||||
In the first example with the square loop:
|
||||
|
||||
.....
|
||||
.S-7.
|
||||
.|.|.
|
||||
.L-J.
|
||||
.....
|
||||
|
||||
You can count the distance each tile in the loop is from the starting
|
||||
point like this:
|
||||
|
||||
.....
|
||||
.012.
|
||||
.1.3.
|
||||
.234.
|
||||
.....
|
||||
|
||||
In this example, the farthest point from the start is 4 steps away.
|
||||
|
||||
Here's the more complex loop again:
|
||||
|
||||
..F7.
|
||||
.FJ|.
|
||||
SJ.L7
|
||||
|F--J
|
||||
LJ...
|
||||
|
||||
Here are the distances for each tile on that loop:
|
||||
|
||||
..45.
|
||||
.236.
|
||||
01.78
|
||||
14567
|
||||
23...
|
||||
|
||||
Find the single giant loop starting at S. How many steps along the loop
|
||||
does it take to get from the starting position to the point farthest from
|
||||
the starting position?
|
||||
|
||||
Your puzzle answer was 6942.
|
||||
|
||||
--- Part Two ---
|
||||
|
||||
You quickly reach the farthest point of the loop, but the animal never
|
||||
emerges. Maybe its nest is within the area enclosed by the loop?
|
||||
|
||||
To determine whether it's even worth taking the time to search for such a
|
||||
nest, you should calculate how many tiles are contained within the loop.
|
||||
For example:
|
||||
|
||||
...........
|
||||
.S-------7.
|
||||
.|F-----7|.
|
||||
.||.....||.
|
||||
.||.....||.
|
||||
.|L-7.F-J|.
|
||||
.|..|.|..|.
|
||||
.L--J.L--J.
|
||||
...........
|
||||
|
||||
The above loop encloses merely four tiles - the two pairs of . in the
|
||||
southwest and southeast (marked I below). The middle . tiles (marked O
|
||||
below) are not in the loop. Here is the same loop again with those regions
|
||||
marked:
|
||||
|
||||
...........
|
||||
.S-------7.
|
||||
.|F-----7|.
|
||||
.||OOOOO||.
|
||||
.||OOOOO||.
|
||||
.|L-7OF-J|.
|
||||
.|II|O|II|.
|
||||
.L--JOL--J.
|
||||
.....O.....
|
||||
|
||||
In fact, there doesn't even need to be a full tile path to the outside for
|
||||
tiles to count as outside the loop - squeezing between pipes is also
|
||||
allowed! Here, I is still within the loop and O is still outside the loop:
|
||||
|
||||
..........
|
||||
.S------7.
|
||||
.|F----7|.
|
||||
.||OOOO||.
|
||||
.||OOOO||.
|
||||
.|L-7F-J|.
|
||||
.|II||II|.
|
||||
.L--JL--J.
|
||||
..........
|
||||
|
||||
In both of the above examples, 4 tiles are enclosed by the loop.
|
||||
|
||||
Here's a larger example:
|
||||
|
||||
.F----7F7F7F7F-7....
|
||||
.|F--7||||||||FJ....
|
||||
.||.FJ||||||||L7....
|
||||
FJL7L7LJLJ||LJ.L-7..
|
||||
L--J.L7...LJS7F-7L7.
|
||||
....F-J..F7FJ|L7L7L7
|
||||
....L7.F7||L7|.L7L7|
|
||||
.....|FJLJ|FJ|F7|.LJ
|
||||
....FJL-7.||.||||...
|
||||
....L---J.LJ.LJLJ...
|
||||
|
||||
The above sketch has many random bits of ground, some of which are in the
|
||||
loop (I) and some of which are outside it (O):
|
||||
|
||||
OF----7F7F7F7F-7OOOO
|
||||
O|F--7||||||||FJOOOO
|
||||
O||OFJ||||||||L7OOOO
|
||||
FJL7L7LJLJ||LJIL-7OO
|
||||
L--JOL7IIILJS7F-7L7O
|
||||
OOOOF-JIIF7FJ|L7L7L7
|
||||
OOOOL7IF7||L7|IL7L7|
|
||||
OOOOO|FJLJ|FJ|F7|OLJ
|
||||
OOOOFJL-7O||O||||OOO
|
||||
OOOOL---JOLJOLJLJOOO
|
||||
|
||||
In this larger example, 8 tiles are enclosed by the loop.
|
||||
|
||||
Any tile that isn't part of the main loop can count as being enclosed by
|
||||
the loop. Here's another example with many bits of junk pipe lying around
|
||||
that aren't connected to the main loop at all:
|
||||
|
||||
FF7FSF7F7F7F7F7F---7
|
||||
L|LJ||||||||||||F--J
|
||||
FL-7LJLJ||||||LJL-77
|
||||
F--JF--7||LJLJ7F7FJ-
|
||||
L---JF-JLJ.||-FJLJJ7
|
||||
|F|F-JF---7F7-L7L|7|
|
||||
|FFJF7L7F-JF7|JL---7
|
||||
7-L-JL7||F7|L7F-7F7|
|
||||
L.L7LFJ|||||FJL7||LJ
|
||||
L7JLJL-JLJLJL--JLJ.L
|
||||
|
||||
Here are just the tiles that are enclosed by the loop marked with I:
|
||||
|
||||
FF7FSF7F7F7F7F7F---7
|
||||
L|LJ||||||||||||F--J
|
||||
FL-7LJLJ||||||LJL-77
|
||||
F--JF--7||LJLJIF7FJ-
|
||||
L---JF-JLJIIIIFJLJJ7
|
||||
|F|F-JF---7IIIL7L|7|
|
||||
|FFJF7L7F-JF7IIL---7
|
||||
7-L-JL7||F7|L7F-7F7|
|
||||
L.L7LFJ|||||FJL7||LJ
|
||||
L7JLJL-JLJLJL--JLJ.L
|
||||
|
||||
In this last example, 10 tiles are enclosed by the loop.
|
||||
|
||||
Figure out whether you have time to search for the nest by calculating the
|
||||
area within the loop. How many tiles are enclosed by the loop?
|
||||
|
||||
Your puzzle answer was 297.
|
||||
|
||||
Both parts of this puzzle are complete! They provide two gold stars: **
|
||||
|
||||
At this point, you should [17]return to your Advent calendar and try
|
||||
another puzzle.
|
||||
|
||||
If you still want to see it, you can [18]get your puzzle input.
|
||||
|
||||
You can also [Shareon [19]Twitter [20]Mastodon] this puzzle.
|
||||
|
||||
References
|
||||
|
||||
Visible links
|
||||
1. https://adventofcode.com/
|
||||
2. https://adventofcode.com/2023/about
|
||||
3. https://adventofcode.com/2023/events
|
||||
4. https://teespring.com/stores/advent-of-code
|
||||
5. https://adventofcode.com/2023/settings
|
||||
6. https://adventofcode.com/2023/auth/logout
|
||||
7. Advent of Code Supporter
|
||||
https://adventofcode.com/2023/support
|
||||
8. https://adventofcode.com/2023
|
||||
9. https://adventofcode.com/2023
|
||||
10. https://adventofcode.com/2023/support
|
||||
11. https://adventofcode.com/2023/sponsors
|
||||
12. https://adventofcode.com/2023/leaderboard
|
||||
13. https://adventofcode.com/2023/stats
|
||||
14. https://adventofcode.com/2023/sponsors
|
||||
15. https://kotlinlang.org/
|
||||
16. https://en.wikipedia.org/wiki/Hot_spring
|
||||
17. https://adventofcode.com/2023
|
||||
18. https://adventofcode.com/2023/day/10/input
|
||||
19. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Pipe+Maze%22+%2D+Day+10+%2D+Advent+of+Code+2023&url=https%3A%2F%2Fadventofcode%2Ecom%2F2023%2Fday%2F10&related=ericwastl&hashtags=AdventOfCode
|
||||
20. javascript:void(0);
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
-L|F7
|
||||
7S-7|
|
||||
L|7||
|
||||
-L-J|
|
||||
L|-JF
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
7-F7-
|
||||
.FJ|7
|
||||
SJLL7
|
||||
|F--J
|
||||
LJ.LJ
|
||||
|
|
@ -0,0 +1,9 @@
|
|||
...........
|
||||
.S-------7.
|
||||
.|F-----7|.
|
||||
.||.....||.
|
||||
.||.....||.
|
||||
.|L-7.F-J|.
|
||||
.|..|.|..|.
|
||||
.L--J.L--J.
|
||||
...........
|
||||
|
|
@ -0,0 +1,10 @@
|
|||
.F----7F7F7F7F-7....
|
||||
.|F--7||||||||FJ....
|
||||
.||.FJ||||||||L7....
|
||||
FJL7L7LJLJ||LJ.L-7..
|
||||
L--J.L7...LJS7F-7L7.
|
||||
....F-J..F7FJ|L7L7L7
|
||||
....L7.F7||L7|.L7L7|
|
||||
.....|FJLJ|FJ|F7|.LJ
|
||||
....FJL-7.||.||||...
|
||||
....L---J.LJ.LJLJ...
|
||||
|
|
@ -184,3 +184,12 @@ func GetHighestX(list ...Coordinate) int {
|
|||
}
|
||||
return top
|
||||
}
|
||||
|
||||
func CoordListContains(needle Coordinate, haystack []Coordinate) bool {
|
||||
for _, chk := range haystack {
|
||||
if chk.Equals(needle) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue