2023 Day 16 Complete!
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124
2023/day16/main.go
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124
2023/day16/main.go
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package main
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import (
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"fmt"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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part1(inp)
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fmt.Println()
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part2(inp)
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}
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var (
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N = h.Coordinate{X: 0, Y: -1}
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E = h.Coordinate{X: 1, Y: 0}
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S = h.Coordinate{X: 0, Y: 1}
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W = h.Coordinate{X: -1, Y: 0}
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)
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// movement describes how a beam moving in a direction should react
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// to a byte
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var movement = map[h.Coordinate]map[byte][]h.Coordinate{
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N: {
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'|': {N},
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'-': {W, E},
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'\\': {W},
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'/': {E},
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'.': {N},
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},
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E: {
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'|': {N, S},
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'-': {E},
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'\\': {S},
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'/': {N},
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'.': {E},
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},
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S: {
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'|': {S},
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'-': {W, E},
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'\\': {E},
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'/': {W},
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'.': {S},
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},
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W: {
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'|': {N, S},
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'-': {W},
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'\\': {N},
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'/': {S},
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'.': {W},
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},
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}
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var tileHistory map[h.Coordinate][]h.Coordinate
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func part1(input []string) {
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mm := h.StringSliceToCoordByteMap(input)
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tileHistory = make(map[h.Coordinate][]h.Coordinate)
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proc(&mm, E, h.Coordinate{X: 0, Y: 0})
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fmt.Println("# Part 1")
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fmt.Println(len(tileHistory))
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}
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func part2(input []string) {
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mm := h.StringSliceToCoordByteMap(input)
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maxTiles := h.MIN_INT
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// starts are a map of positions -> directions to test as a starting point
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starts := make(map[*h.Coordinate]h.Coordinate)
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for y := mm.TLY; y <= mm.BRY; y++ {
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for x := mm.TLX; x <= mm.BRX; x++ {
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if y != mm.TLY && x != mm.TLX && y != mm.BRY && x != mm.BRX {
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continue
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}
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if y == mm.TLY {
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// South facing beams
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starts[&h.Coordinate{Y: y, X: x}] = S
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} else if y == mm.BRY {
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// North facing beams
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starts[&h.Coordinate{Y: y, X: x}] = N
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}
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if x == mm.TLX {
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// East facing beams
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starts[&h.Coordinate{Y: y, X: x}] = E
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}
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if x == mm.BRX {
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// West facing beams
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starts[&h.Coordinate{Y: y, X: x}] = W
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}
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}
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}
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for pos, dir := range starts {
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tileHistory = make(map[h.Coordinate][]h.Coordinate)
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proc(&mm, dir, *pos)
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if len(tileHistory) > maxTiles {
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maxTiles = len(tileHistory)
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}
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}
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fmt.Println("# Part 2")
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fmt.Println(maxTiles)
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}
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func proc(mm *h.CoordByteMap, dir, pos h.Coordinate) {
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if !mm.ContainsCoord(pos) {
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return
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}
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if visits, ok := tileHistory[pos]; ok {
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for _, v := range visits {
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if v == dir {
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return
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}
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}
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}
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curr := mm.Get(pos)
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tileHistory[pos] = append(tileHistory[pos], dir)
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next := movement[dir][curr]
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for _, n := range next {
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proc(mm, n, pos.Add(n))
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}
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}
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203
2023/day16/problem
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203
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[1]Advent of Code
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• [2][About]
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• [3][Events]
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• [4][Shop]
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• [5][Settings]
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• [6][Log Out]
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br0xen [7](AoC++) 32*
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λy.[8]2023
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• [9][Calendar]
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• [10][AoC++]
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• [11][Sponsors]
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• [12][Leaderboard]
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• [13][Stats]
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Our [14]sponsors help make Advent of Code possible:
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[15]JPMorgan Chase - With over 57,000 technologists globally and an annual
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tech spend of $15 billion, JPMorgan Chase is dedicated to improving the
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design, analytics, coding and testing that goes into creating high quality
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software products.
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--- Day 16: The Floor Will Be Lava ---
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With the beam of light completely focused somewhere, the reindeer leads
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you deeper still into the Lava Production Facility. At some point, you
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realize that the steel facility walls have been replaced with cave, and
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the doorways are just cave, and the floor is cave, and you're pretty sure
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this is actually just a giant cave.
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Finally, as you approach what must be the heart of the mountain, you see a
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bright light in a cavern up ahead. There, you discover that the beam of
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light you so carefully focused is emerging from the cavern wall closest to
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the facility and pouring all of its energy into a contraption on the
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opposite side.
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Upon closer inspection, the contraption appears to be a flat,
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two-dimensional square grid containing empty space (.), mirrors (/ and \),
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and splitters (| and -).
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The contraption is aligned so that most of the beam bounces around the
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grid, but each tile on the grid converts some of the beam's light into
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heat to melt the rock in the cavern.
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You note the layout of the contraption (your puzzle input). For example:
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.|...\....
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|.-.\.....
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.....|-...
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........|.
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..........
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.........\
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..../.\\..
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.-.-/..|..
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.|....-|.\
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..//.|....
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The beam enters in the top-left corner from the left and heading to the
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right. Then, its behavior depends on what it encounters as it moves:
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• If the beam encounters empty space (.), it continues in the same
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direction.
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• If the beam encounters a mirror (/ or \), the beam is reflected 90
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degrees depending on the angle of the mirror. For instance, a
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rightward-moving beam that encounters a / mirror would continue upward
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in the mirror's column, while a rightward-moving beam that encounters
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a \ mirror would continue downward from the mirror's column.
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• If the beam encounters the pointy end of a splitter (| or -), the beam
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passes through the splitter as if the splitter were empty space. For
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instance, a rightward-moving beam that encounters a - splitter would
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|
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);
|
||||||
10
2023/day16/testinput
Normal file
10
2023/day16/testinput
Normal file
@ -0,0 +1,10 @@
|
|||||||
|
.|...\....
|
||||||
|
|.-.\.....
|
||||||
|
.....|-...
|
||||||
|
........|.
|
||||||
|
..........
|
||||||
|
.........\
|
||||||
|
..../.\\..
|
||||||
|
.-.-/..|..
|
||||||
|
.|....-|.\
|
||||||
|
..//.|....
|
||||||
Loading…
Reference in New Issue
Block a user