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2023 Day 16 Complete!

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Brian Buller 2023-12-16 10:17:04 -06:00
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\..|...................|........\..............\.................-......./........./...\..........-......./...
........../...-/......\.|............../.................\...........\........-.........|.....\.-.|...........
...............-...........|......|...|......../.......\............../.................................../...
..................................|............../..|.|.../............./..\\........|...|..............\..|..
...........................-...-...-.......................-.....-.-....\.......-............................/
........-...|.......|./../......................./.........................\.................../.....\........
\..\............-.\.........|../................................\....\......................./.............-..
|\...|....\................\...|........\-..............|............\.........\.\..|.|.......................
.....\.........\......|...-...............................-.............-../.../..--......\.....\.............
................|...........................|..........\...........././.................../............../....
.............................\......\.../..|................---................-......\....|...-............-.
..........|........./......\|...|.......|........\......\....-....\...-...../................/..-..../......-.
...|............./.................\../....|...\../.................|...|..|......|...........................
..................................-......../.....|............................................................
...................-.............|...-.........../...........................-..............-...............|.
..-.............../.............................-......-.....-.............|-...../....................../....
....||...../.........................................-...........................................--./-.......\
...................\..........-......./..............|\........................../.-.|..............-..-/...|.
.-............-............../..-........../.......................\...-...||........./.-.....-....../........
.......-.......-........................................../\\.......|......./../..\........\..-.........../../
....../../.......................\.........\-....\.|..................\......................./...-\..........
\.......-........\...-.....................\....-........./-...|......|.......-........................\...\..
...|\.................................../..../..........|......-......../-..|......./..........\../..|......-\
..........\...........................|..-........-/-......../....|...............................\.....|.....
..............\......-............................-.../........|........................./........-...........
.............-..\.//.....................-....-......|....../....-............................/..............|
\........../....|................./.....\......\.../.................|........\............../................
.....-........-/|.........\.....-./............|...\.|......|.......|...................\\.....\.............-
................|.-...-.....................|..........-....\....\......../...............................././
...........|.......\..............\......................................./........-..........................
...........................-..../............|............................|...........\.......................
....................|..........|..................../...........\.....|.........-............\.\...-..\.......
................................-......-......\.....-/......\...\................/................-...........
..|.....\..\......|../....................................................\\......-...../..../..............//
.........\.................\..\..-.-..................\.....\..\.....\..........-.............................
...................\............/..\............|.............../..\............................|\.\...../....
......|...............\.......|......|/........|....-.......|...........-.../.\....\.....|./.......|..........
....\/|................-.-..........|.................../..............|../-...|/..........|..................
..|........./-\.............|...|............|......\...................\..../.........|...............|.-....
...................-................\....|/....-...|......./....../..........-|............/......\../..\\....
...........................-..........................................-...|.|................\../...........-.
......../.....|.........-.......|........./-............|../.......|......-.-.-.......................-..|-...
.........|-...............|............./.....|........../..|........\..........|/.............../-...........
...\.....|..|...........\....-...\/.........................................|...................\......-.-....
.../...-...|.............|.....\...|.................................../..............\.................../...
..........-.........../....|.....|..-.........../.................................-..................\....\/..
....../..............\../......../.....-./....|../.\....-.................../............................../.\
......-.|..........................\...............|.......-...-....../.............//...\|................/..
................/.........|........................|......./..|......../-...........................\....|....
........../...|.........\...........-./......\\...........\......|-......|...\...............\................
../.........................|.................-/...........--.........\.../........................\.........\
........\..|...|.............../...................-.........|.................\..|......./.........-.....-|..
\.../.......|.............|-.../.................\...\..........\...|..........\....../......-................
............|.|....\..--............-/-..................../........................-../..\..-................
.....................................|.................../.................................|..../..-......\...
....|..............|..-.....|../.........................................|........\.................|.........
..............\..|...............\....||........../................................\................./.\......
.....................-../......./....../.................................-............\........../............
.....|.............../......-.\.|........-...................|.....-........\...-.............-....-.......-..
..../.....|..............\../..............................\........|....................|..............\.....
....\................-........\../......|..../......................-.....|............../.../........../.....
....-...........................-.............|...........\..|........|.......\././.....|./..........\........
/....................\..............\.............................-......................../\......../....-...
......\..................-............................................./.\...../.............\....-....\.\....
..................................\-............................/.......|........................-|...........
.................../.../.......|./............\.........\....-.-....-../\.........|........./...\.............
......./.../....|...../|......................|.....|.....|.........|...........\......-.\..................|.
..././...........................|.......\.|......-........./.................................................
........|.|.......................-....................././.......||...........|/....-....\.......|......\/...
.\.\.....|....\......-....|...|.....//........|..-.........-.................-........./......................
.|.....................\............-.................................|..../.............-....../.........../.
.|..\..../...............\..................../...\............................-....../................../.|..
./.\............................/.............-...../-................\.........\.............|...../.........
..........\...............................\............../.........\.....-/........./|........................
.............\..|....|..................................\.........|./......................\.........-........
../.....|-............|...\................|...-....-........./........|.-..........\.........................
........-............./...........--................../...............................|..|.\....\.............
\.............-\.........................-|......|/.........\............/...........-.../.\........\..\.../..
......................|........\....-../.............|......|.-...................................-|../...-...
.............|...|.....-...........|.....-...............|...\........................./..\....\..............
..............|.............-.........../....-..................................|......./........|............
...........|.-..../......................................\....-...\-......../........-..........-......-.....|
../...........-............-.../|...........-.-.............\.............................|.............-.....
.........../...-............../........./...................................../......-.......\\...............
........................./.||......|...../.......|....|..................-..........|......\..................
............/....-./..-...........|...-..........\....../...\/.......|\.....\....|........../..\.\............
.......................................-.../.......|............|........|...\..........\.....-...............
/..\|.............-...-.................................\........\...................\......|....-............
..................\............../........................./.........|..........\...\......\..........|......|
.../.................................................../...|............../....\...\...../........|.......-...
..................-.-..........................\.................-......................-..\.........-........
...................../\.....\.............\.............../................\.|............../........./.......
....................|../.\./......................................-.../.......\...............................
|........................-..............................................|...............................-.....
....\.\...........\......|.........\/|..|....|.....\............-...../.............................\\........
......\....|......\|.....-..................\........\.......................-............-.|..............|..
....|.....././.......................|......../...........-.|............./......-.|....../.....\......|....\.
.........\........|.......\..........|........./..................\.........................|................-
.....\..........\.....-......../...|-........../...\/|........................................................
.../.....................\../.........\.|.........-..........\...............................|...............\
.........-...........................................-.|...........\......//............../..|.\............/.
.-|../...../.........|............./..........................|..-.\......\............\................../...
../....../.................|..............\.........|.\......\...../.......\............\./.......|....../..\.
......../.-..-......\.........................\|...................................-....../...................
......................-....|........./\................|......\..-\....../.......\.................\/.-\......
............\...|...............|............./...........................................\....-.-............
\.........|.............................|............/.........-.....\........\|...-..-..\/.../......./.......
.............................\.|...............\....\..\-.....................\......-...../......\..../.....\
..\-......\.\........-........../........\...............\..................../....-....\.\.|.|...............
................|./........../.................................-.............|...................\............

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package main
import (
"fmt"
h "git.bullercodeworks.com/brian/adventofcode/helpers"
)
func main() {
inp := h.StdinToStringSlice()
part1(inp)
fmt.Println()
part2(inp)
}
var (
N = h.Coordinate{X: 0, Y: -1}
E = h.Coordinate{X: 1, Y: 0}
S = h.Coordinate{X: 0, Y: 1}
W = h.Coordinate{X: -1, Y: 0}
)
// movement describes how a beam moving in a direction should react
// to a byte
var movement = map[h.Coordinate]map[byte][]h.Coordinate{
N: {
'|': {N},
'-': {W, E},
'\\': {W},
'/': {E},
'.': {N},
},
E: {
'|': {N, S},
'-': {E},
'\\': {S},
'/': {N},
'.': {E},
},
S: {
'|': {S},
'-': {W, E},
'\\': {E},
'/': {W},
'.': {S},
},
W: {
'|': {N, S},
'-': {W},
'\\': {N},
'/': {S},
'.': {W},
},
}
var tileHistory map[h.Coordinate][]h.Coordinate
func part1(input []string) {
mm := h.StringSliceToCoordByteMap(input)
tileHistory = make(map[h.Coordinate][]h.Coordinate)
proc(&mm, E, h.Coordinate{X: 0, Y: 0})
fmt.Println("# Part 1")
fmt.Println(len(tileHistory))
}
func part2(input []string) {
mm := h.StringSliceToCoordByteMap(input)
maxTiles := h.MIN_INT
// starts are a map of positions -> directions to test as a starting point
starts := make(map[*h.Coordinate]h.Coordinate)
for y := mm.TLY; y <= mm.BRY; y++ {
for x := mm.TLX; x <= mm.BRX; x++ {
if y != mm.TLY && x != mm.TLX && y != mm.BRY && x != mm.BRX {
continue
}
if y == mm.TLY {
// South facing beams
starts[&h.Coordinate{Y: y, X: x}] = S
} else if y == mm.BRY {
// North facing beams
starts[&h.Coordinate{Y: y, X: x}] = N
}
if x == mm.TLX {
// East facing beams
starts[&h.Coordinate{Y: y, X: x}] = E
}
if x == mm.BRX {
// West facing beams
starts[&h.Coordinate{Y: y, X: x}] = W
}
}
}
for pos, dir := range starts {
tileHistory = make(map[h.Coordinate][]h.Coordinate)
proc(&mm, dir, *pos)
if len(tileHistory) > maxTiles {
maxTiles = len(tileHistory)
}
}
fmt.Println("# Part 2")
fmt.Println(maxTiles)
}
func proc(mm *h.CoordByteMap, dir, pos h.Coordinate) {
if !mm.ContainsCoord(pos) {
return
}
if visits, ok := tileHistory[pos]; ok {
for _, v := range visits {
if v == dir {
return
}
}
}
curr := mm.Get(pos)
tileHistory[pos] = append(tileHistory[pos], dir)
next := movement[dir][curr]
for _, n := range next {
proc(mm, n, pos.Add(n))
}
}

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[1]Advent of Code
• [2][About]
• [3][Events]
• [4][Shop]
• [5][Settings]
• [6][Log Out]
br0xen [7](AoC++) 32*
       λy.[8]2023
• [9][Calendar]
• [10][AoC++]
• [11][Sponsors]
• [12][Leaderboard]
• [13][Stats]
Our [14]sponsors help make Advent of Code possible:
[15]JPMorgan Chase - With over 57,000 technologists globally and an annual
tech spend of $15 billion, JPMorgan Chase is dedicated to improving the
design, analytics, coding and testing that goes into creating high quality
software products.
--- Day 16: The Floor Will Be Lava ---
With the beam of light completely focused somewhere, the reindeer leads
you deeper still into the Lava Production Facility. At some point, you
realize that the steel facility walls have been replaced with cave, and
the doorways are just cave, and the floor is cave, and you're pretty sure
this is actually just a giant cave.
Finally, as you approach what must be the heart of the mountain, you see a
bright light in a cavern up ahead. There, you discover that the beam of
light you so carefully focused is emerging from the cavern wall closest to
the facility and pouring all of its energy into a contraption on the
opposite side.
Upon closer inspection, the contraption appears to be a flat,
two-dimensional square grid containing empty space (.), mirrors (/ and \),
and splitters (| and -).
The contraption is aligned so that most of the beam bounces around the
grid, but each tile on the grid converts some of the beam's light into
heat to melt the rock in the cavern.
You note the layout of the contraption (your puzzle input). For example:
.|...\....
|.-.\.....
.....|-...
........|.
..........
.........\
..../.\\..
.-.-/..|..
.|....-|.\
..//.|....
The beam enters in the top-left corner from the left and heading to the
right. Then, its behavior depends on what it encounters as it moves:
• If the beam encounters empty space (.), it continues in the same
direction.
• If the beam encounters a mirror (/ or \), the beam is reflected 90
degrees depending on the angle of the mirror. For instance, a
rightward-moving beam that encounters a / mirror would continue upward
in the mirror's column, while a rightward-moving beam that encounters
a \ mirror would continue downward from the mirror's column.
• If the beam encounters the pointy end of a splitter (| or -), the beam
passes through the splitter as if the splitter were empty space. For
instance, a rightward-moving beam that encounters a - splitter would
continue in the same direction.
• If the beam encounters the flat side of a splitter (| or -), the beam
is split into two beams going in each of the two directions the
splitter's pointy ends are pointing. For instance, a rightward-moving
beam that encounters a | splitter would split into two beams: one that
continues upward from the splitter's column and one that continues
downward from the splitter's column.
Beams do not interact with other beams; a tile can have many beams passing
through it at the same time. A tile is energized if that tile has at least
one beam pass through it, reflect in it, or split in it.
In the above example, here is how the beam of light bounces around the
contraption:
>|<<<\....
|v-.\^....
.v...|->>>
.v...v^.|.
.v...v^...
.v...v^..\
.v../2\\..
<->-/vv|..
.|<<<2-|.\
.v//.|.v..
Beams are only shown on empty tiles; arrows indicate the direction of the
beams. If a tile contains beams moving in multiple directions, the number
of distinct directions is shown instead. Here is the same diagram but
instead only showing whether a tile is energized (#) or not (.):
######....
.#...#....
.#...#####
.#...##...
.#...##...
.#...##...
.#..####..
########..
.#######..
.#...#.#..
Ultimately, in this example, 46 tiles become energized.
The light isn't energizing enough tiles to produce lava; to debug the
contraption, you need to start by analyzing the current situation. With
the beam starting in the top-left heading right, how many tiles end up
being energized?
Your puzzle answer was 6816.
--- Part Two ---
As you try to work out what might be wrong, the reindeer tugs on your
shirt and leads you to a nearby control panel. There, a collection of
buttons lets you align the contraption so that the beam enters from any
edge tile and heading away from that edge. (You can choose either of two
directions for the beam if it starts on a corner; for instance, if the
beam starts in the bottom-right corner, it can start heading either left
or upward.)
So, the beam could start on any tile in the top row (heading downward),
any tile in the bottom row (heading upward), any tile in the leftmost
column (heading right), or any tile in the rightmost column (heading
left). To produce lava, you need to find the configuration that energizes
as many tiles as possible.
In the above example, this can be achieved by starting the beam in the
fourth tile from the left in the top row:
.|<2<\....
|v-v\^....
.v.v.|->>>
.v.v.v^.|.
.v.v.v^...
.v.v.v^..\
.v.v/2\\..
<-2-/vv|..
.|<<<2-|.\
.v//.|.v..
Using this configuration, 51 tiles are energized:
.#####....
.#.#.#....
.#.#.#####
.#.#.##...
.#.#.##...
.#.#.##...
.#.#####..
########..
.#######..
.#...#.#..
Find the initial beam configuration that energizes the largest number of
tiles; how many tiles are energized in that configuration?
Your puzzle answer was 8163.
Both parts of this puzzle are complete! They provide two gold stars: **
At this point, you should [16]return to your Advent calendar and try
another puzzle.
If you still want to see it, you can [17]get your puzzle input.
You can also [Shareon [18]Twitter [19]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://www.jpmorgan.com/
16. https://adventofcode.com/2023
17. https://adventofcode.com/2023/day/16/input
18. https://twitter.com/intent/tweet?text=I%27ve+completed+%22The+Floor+Will+Be+Lava%22+%2D+Day+16+%2D+Advent+of+Code+2023&url=https%3A%2F%2Fadventofcode%2Ecom%2F2023%2Fday%2F16&related=ericwastl&hashtags=AdventOfCode
19. javascript:void(0);

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.|...\....
|.-.\.....
.....|-...
........|.
..........
.........\
..../.\\..
.-.-/..|..
.|....-|.\
..//.|....