2023 Day 14 Complete!
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2023/day14/input
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2023/day14/input
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O.O#..O.#...#..O.O#..O#...O..O.#...O#.OO.O...#....#.O.##..####.OOO....OO......##..........#O.#O.O.#.
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OO.#.#...#..O.#.#.OO..OO.#O.#..O....OOO.#.....O.OO....O.#.#..##.....O.#...O......#OO#..O.O..#.....#.
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O.O..O..##..O...O.#O#.O.#.O..#O.OO#.OO..O..#...O.........#OO.......O...OO..####O...O..O...#OOO..O.O.
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O..#.O.#.OOO...#O.....O#O.#O#.OO...#OO.#.##.........O..O#O#.#.O#...O..O....O..#O...O#O...O..O.O.....
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.#...#O..##.##.OO....##.....#O...#.O.O..#.....##......OO#OO.#...O...#..O....O#.#.O..O.#.......O.#.#O
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......O.O#....O.......O.O...O..O#..O...#....#O..##OO.#O......OOO.....#.#O.O#.O#.O....O#O#O..###.#...
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O...#..OO....O.......#.OO...O........O.OO..#..#..#.#.O..O.#....O.O......OO..OO.O..#..OOO#..OOO......
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.OO#.O.....O..#...O.....O....O#........#....#.....O..#..###...#.O.......OO......O..O.OO..O..#.O#O#..
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O....O...##.#....#O..O.#......................O..O#OOO..##....#.#..O.O.....O#..O.O.O...#.#.OOO...O..
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.......O..OO.O..O#.OO.#.O..#O....#.OOO.........##......#.O#.O..O....O....O.....#O.O...O.#.......O.#O
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....O##.#...O.##...O#...OOOO...OO...#.O.#...O.#O.......#.O.....##....O.#O....#......##.O....O.OO#..O
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OO...O#O#O#.#OO.#O.O..#.#.#.#.............#.O........#...O..O......O#.#OO.O...#.O..O...O#.O....O#..O
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.#..O..#.OO.#O...O#.O.#.#..#.......#.......#O...#..#O#....O...#....OO.....O......O..#.....O..O..#.O#
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O...#OO.O.OO#..O....##O...#....#...#.O.O..O.........#..##.#O.#.OO..OO...#...O.O#.OO..#.O.OO#.#..##OO
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......O.O.OO#.O.......O#O.OO.#..O....O...#.O#..#....O.#....#..#O...#.OO.O#........#......O....O.O...
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..#...##...#.O.O..#...O#.....##.......OO..O.#....O.O#O#..O...O#..OO...##O...O..O.....#.#...O.O......
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OOO.O.O#O......#..OO.O...OO...O............O..O#..##O...###.#......O#..#.O..O.OOO...#..O#......#OO.#
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O###.......#.O.O.#.....#.OO..O.O...#..O#O..#O.O.#.O..O.O..O#.#....#..#...O#..###.#..O#.O.........OO.
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.......#O#OO#...#.#...#.O...O.....O.O#.....O.O.O##.#...#O.#....OO...O.OO..O....O.O..#..#.....O...#..
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.O..###..OO#O.#.#OO.O#...#..O#...O.....O#.O......O...OO..O..O.....O..##.....OO.....O......O........O
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..O..#.O.#..OO.O#..O#..O.....OO#O#....OO.OO#O...O...O.O......OO.#O#....O..#O.#.OO##.#....#O#.#......
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O.#O.O.O.O...OO.....O.#...##..#....O....O..#..#O#..O#.#.OO.#O..........#...O..##..O.##.O.O...#.#O..#
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......O#...O.#..O#.O.........#.#....O.O....O.#..O..O##.#..O....#..#O#.OO.........#.O##O.....OO.OO.O.
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#....#.#O.O.O............O.O.#.O..O.........O..O........O......O.....OO.OO..OO.#....OO.OO.#....#..##
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.......#...O.O.#.O.....#.O#.#..O..O...O.O.#O..#...##.........O..#.OO..O........#.....#.......OO.....
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...#....O...O...#O.OO...#....#..O.#.O.#......##.#.#.OO.O.O...#..#..O........O.##..O...O#O...OO.O....
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.#..#.....#.O..O..O.....##..O.........O#.##O....OO...O...#..O.O.##OO......O.#..O....O..O.#.O.O...O.O
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.O....O...O....#.O......#..##O.#..O..O.....O...OO..###....#..#..#..........#.#.#.#.#........O...O.O.
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.OOO.#.#O....O.#...OO#.##...#...O.#...OO..###..OO.#.O....O..OO#..O..O....O#.#.O####..O....O..O#O....
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.OO.OO#......#....#..##O#O...OO....#....O......OO..OOO.....##.......O#.#.O.#O......O..#.#O..O.O..#..
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128
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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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func part1(input []string) {
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m := h.StringSliceToCoordByteMap(input)
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fmt.Println("# Part 1")
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tiltNorth(&m)
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fmt.Println(calcLoad(&m))
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}
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func part2(input []string) {
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target := 1_000_000_000
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mapCache := make(map[string]int)
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m := h.StringSliceToCoordByteMap(input)
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var i = 0
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var ignoreCache bool
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for ; i <= target; i++ {
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tiltNorth(&m)
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tiltWest(&m)
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tiltSouth(&m)
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tiltEast(&m)
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if !ignoreCache {
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if v, ok := mapCache[m.String()]; ok && i > 200 {
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target = i + (target-v)%(i-v) - 1
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ignoreCache = true
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}
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mapCache[m.String()] = i
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}
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}
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fmt.Println("# Part 2")
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fmt.Println(calcLoad(&m))
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}
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func c(x, y int) h.Coordinate { return h.Coordinate{X: x, Y: y} }
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// m.FindAll returns a slice sorted Left->Right, Top->Bottom
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func tiltNorth(m *h.CoordByteMap) {
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rocks := m.FindAll('O')
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for i := range rocks {
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if rocks[i].Y == m.TLY {
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continue
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}
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mv := h.Coordinate{X: rocks[i].X, Y: rocks[i].Y}
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for m.Get(mv.North()) == '.' {
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mv.MoveNorth()
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}
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if !mv.Equals(rocks[i]) {
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m.Put(rocks[i], '.')
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m.Put(mv, 'O')
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}
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}
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}
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func tiltEast(m *h.CoordByteMap) {
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rocks := m.FindAll('O')
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for i, j := 0, len(rocks)-1; i < j; i, j = i+1, j-1 {
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rocks[i], rocks[j] = rocks[j], rocks[i]
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}
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for i := range rocks {
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if rocks[i].X == m.BRX {
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continue
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}
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mv := h.Coordinate{X: rocks[i].X, Y: rocks[i].Y}
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for m.Get(mv.East()) == '.' {
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mv.MoveEast()
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}
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if !mv.Equals(rocks[i]) {
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m.Put(rocks[i], '.')
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m.Put(mv, 'O')
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}
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|
}
|
||||||
|
}
|
||||||
|
func tiltSouth(m *h.CoordByteMap) {
|
||||||
|
rocks := m.FindAll('O')
|
||||||
|
for i, j := 0, len(rocks)-1; i < j; i, j = i+1, j-1 {
|
||||||
|
rocks[i], rocks[j] = rocks[j], rocks[i]
|
||||||
|
}
|
||||||
|
for i := range rocks {
|
||||||
|
if rocks[i].Y == m.BRY {
|
||||||
|
continue
|
||||||
|
}
|
||||||
|
mv := h.Coordinate{X: rocks[i].X, Y: rocks[i].Y}
|
||||||
|
for m.Get(mv.South()) == '.' {
|
||||||
|
mv.MoveSouth()
|
||||||
|
}
|
||||||
|
if !mv.Equals(rocks[i]) {
|
||||||
|
m.Put(rocks[i], '.')
|
||||||
|
m.Put(mv, 'O')
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
func tiltWest(m *h.CoordByteMap) {
|
||||||
|
rocks := m.FindAll('O')
|
||||||
|
for i := range rocks {
|
||||||
|
if rocks[i].X == m.TLX {
|
||||||
|
continue
|
||||||
|
}
|
||||||
|
mv := h.Coordinate{X: rocks[i].X, Y: rocks[i].Y}
|
||||||
|
for m.Get(mv.West()) == '.' {
|
||||||
|
mv.MoveWest()
|
||||||
|
}
|
||||||
|
if !mv.Equals(rocks[i]) {
|
||||||
|
m.Put(rocks[i], '.')
|
||||||
|
m.Put(mv, 'O')
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func calcLoad(m *h.CoordByteMap) int {
|
||||||
|
var res int
|
||||||
|
bot := m.BRY
|
||||||
|
rocks := m.FindAll('O')
|
||||||
|
for i := range rocks {
|
||||||
|
res += (bot - rocks[i].Y) + 1
|
||||||
|
}
|
||||||
|
return res
|
||||||
|
}
|
||||||
203
2023/day14/problem
Normal file
203
2023/day14/problem
Normal file
@ -0,0 +1,203 @@
|
|||||||
|
[1]Advent of Code
|
||||||
|
|
||||||
|
• [2][About]
|
||||||
|
• [3][Events]
|
||||||
|
• [4][Shop]
|
||||||
|
• [5][Settings]
|
||||||
|
• [6][Log Out]
|
||||||
|
|
||||||
|
br0xen [7](AoC++) 28*
|
||||||
|
|
||||||
|
$year=[8]2023;
|
||||||
|
|
||||||
|
• [9][Calendar]
|
||||||
|
• [10][AoC++]
|
||||||
|
• [11][Sponsors]
|
||||||
|
• [12][Leaderboard]
|
||||||
|
• [13][Stats]
|
||||||
|
|
||||||
|
Our [14]sponsors help make Advent of Code possible:
|
||||||
|
[15]Jane Street - Will our next great idea come from you? We hire smart,
|
||||||
|
humble people who love to solve problems, build systems, and test
|
||||||
|
theories. Our success is driven by our people and we never stop improving.
|
||||||
|
|
||||||
|
--- Day 14: Parabolic Reflector Dish ---
|
||||||
|
|
||||||
|
You reach the place where all of the mirrors were pointing: a massive
|
||||||
|
[16]parabolic reflector dish attached to the side of another large
|
||||||
|
mountain.
|
||||||
|
|
||||||
|
The dish is made up of many small mirrors, but while the mirrors
|
||||||
|
themselves are roughly in the shape of a parabolic reflector dish, each
|
||||||
|
individual mirror seems to be pointing in slightly the wrong direction. If
|
||||||
|
the dish is meant to focus light, all it's doing right now is sending it
|
||||||
|
in a vague direction.
|
||||||
|
|
||||||
|
This system must be what provides the energy for the lava! If you focus
|
||||||
|
the reflector dish, maybe you can go where it's pointing and use the light
|
||||||
|
to fix the lava production.
|
||||||
|
|
||||||
|
Upon closer inspection, the individual mirrors each appear to be connected
|
||||||
|
via an elaborate system of ropes and pulleys to a large metal platform
|
||||||
|
below the dish. The platform is covered in large rocks of various shapes.
|
||||||
|
Depending on their position, the weight of the rocks deforms the platform,
|
||||||
|
and the shape of the platform controls which ropes move and ultimately the
|
||||||
|
focus of the dish.
|
||||||
|
|
||||||
|
In short: if you move the rocks, you can focus the dish. The platform even
|
||||||
|
has a control panel on the side that lets you tilt it in one of four
|
||||||
|
directions! The rounded rocks (O) will roll when the platform is tilted,
|
||||||
|
while the cube-shaped rocks (#) will stay in place. You note the positions
|
||||||
|
of all of the empty spaces (.) and rocks (your puzzle input). For example:
|
||||||
|
|
||||||
|
O....#....
|
||||||
|
O.OO#....#
|
||||||
|
.....##...
|
||||||
|
OO.#O....O
|
||||||
|
.O.....O#.
|
||||||
|
O.#..O.#.#
|
||||||
|
..O..#O..O
|
||||||
|
.......O..
|
||||||
|
#....###..
|
||||||
|
#OO..#....
|
||||||
|
|
||||||
|
Start by tilting the lever so all of the rocks will slide north as far as
|
||||||
|
they will go:
|
||||||
|
|
||||||
|
OOOO.#.O..
|
||||||
|
OO..#....#
|
||||||
|
OO..O##..O
|
||||||
|
O..#.OO...
|
||||||
|
........#.
|
||||||
|
..#....#.#
|
||||||
|
..O..#.O.O
|
||||||
|
..O.......
|
||||||
|
#....###..
|
||||||
|
#....#....
|
||||||
|
|
||||||
|
You notice that the support beams along the north side of the platform are
|
||||||
|
damaged; to ensure the platform doesn't collapse, you should calculate the
|
||||||
|
total load on the north support beams.
|
||||||
|
|
||||||
|
The amount of load caused by a single rounded rock (O) is equal to the
|
||||||
|
number of rows from the rock to the south edge of the platform, including
|
||||||
|
the row the rock is on. (Cube-shaped rocks (#) don't contribute to load.)
|
||||||
|
So, the amount of load caused by each rock in each row is as follows:
|
||||||
|
|
||||||
|
OOOO.#.O.. 10
|
||||||
|
OO..#....# 9
|
||||||
|
OO..O##..O 8
|
||||||
|
O..#.OO... 7
|
||||||
|
........#. 6
|
||||||
|
..#....#.# 5
|
||||||
|
..O..#.O.O 4
|
||||||
|
..O....... 3
|
||||||
|
#....###.. 2
|
||||||
|
#....#.... 1
|
||||||
|
|
||||||
|
The total load is the sum of the load caused by all of the rounded rocks.
|
||||||
|
In this example, the total load is 136.
|
||||||
|
|
||||||
|
Tilt the platform so that the rounded rocks all roll north. Afterward,
|
||||||
|
what is the total load on the north support beams?
|
||||||
|
|
||||||
|
Your puzzle answer was 108813.
|
||||||
|
|
||||||
|
--- Part Two ---
|
||||||
|
|
||||||
|
The parabolic reflector dish deforms, but not in a way that focuses the
|
||||||
|
beam. To do that, you'll need to move the rocks to the edges of the
|
||||||
|
platform. Fortunately, a button on the side of the control panel labeled
|
||||||
|
"spin cycle" attempts to do just that!
|
||||||
|
|
||||||
|
Each cycle tilts the platform four times so that the rounded rocks roll
|
||||||
|
north, then west, then south, then east. After each tilt, the rounded
|
||||||
|
rocks roll as far as they can before the platform tilts in the next
|
||||||
|
direction. After one cycle, the platform will have finished rolling the
|
||||||
|
rounded rocks in those four directions in that order.
|
||||||
|
|
||||||
|
Here's what happens in the example above after each of the first few
|
||||||
|
cycles:
|
||||||
|
|
||||||
|
After 1 cycle:
|
||||||
|
.....#....
|
||||||
|
....#...O#
|
||||||
|
...OO##...
|
||||||
|
.OO#......
|
||||||
|
.....OOO#.
|
||||||
|
.O#...O#.#
|
||||||
|
....O#....
|
||||||
|
......OOOO
|
||||||
|
#...O###..
|
||||||
|
#..OO#....
|
||||||
|
|
||||||
|
After 2 cycles:
|
||||||
|
.....#....
|
||||||
|
....#...O#
|
||||||
|
.....##...
|
||||||
|
..O#......
|
||||||
|
.....OOO#.
|
||||||
|
.O#...O#.#
|
||||||
|
....O#...O
|
||||||
|
.......OOO
|
||||||
|
#..OO###..
|
||||||
|
#.OOO#...O
|
||||||
|
|
||||||
|
After 3 cycles:
|
||||||
|
.....#....
|
||||||
|
....#...O#
|
||||||
|
.....##...
|
||||||
|
..O#......
|
||||||
|
.....OOO#.
|
||||||
|
.O#...O#.#
|
||||||
|
....O#...O
|
||||||
|
.......OOO
|
||||||
|
#...O###.O
|
||||||
|
#.OOO#...O
|
||||||
|
|
||||||
|
This process should work if you leave it running long enough, but you're
|
||||||
|
still worried about the north support beams. To make sure they'll survive
|
||||||
|
for a while, you need to calculate the total load on the north support
|
||||||
|
beams after 1000000000 cycles.
|
||||||
|
|
||||||
|
In the above example, after 1000000000 cycles, the total load on the north
|
||||||
|
support beams is 64.
|
||||||
|
|
||||||
|
Run the spin cycle for 1000000000 cycles. Afterward, what is the total
|
||||||
|
load on the north support beams?
|
||||||
|
|
||||||
|
Your puzzle answer was 104533.
|
||||||
|
|
||||||
|
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://www.janestreet.com/
|
||||||
|
16. https://en.wikipedia.org/wiki/Parabolic_reflector
|
||||||
|
17. https://adventofcode.com/2023
|
||||||
|
18. https://adventofcode.com/2023/day/14/input
|
||||||
|
19. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Parabolic+Reflector+Dish%22+%2D+Day+14+%2D+Advent+of+Code+2023&url=https%3A%2F%2Fadventofcode%2Ecom%2F2023%2Fday%2F14&related=ericwastl&hashtags=AdventOfCode
|
||||||
|
20. javascript:void(0);
|
||||||
10
2023/day14/testinput
Normal file
10
2023/day14/testinput
Normal file
@ -0,0 +1,10 @@
|
|||||||
|
O....#....
|
||||||
|
O.OO#....#
|
||||||
|
.....##...
|
||||||
|
OO.#O....O
|
||||||
|
.O.....O#.
|
||||||
|
O.#..O.#.#
|
||||||
|
..O..#O..O
|
||||||
|
.......O..
|
||||||
|
#....###..
|
||||||
|
#OO..#....
|
||||||
@ -42,6 +42,44 @@ func StringSliceToCoordByteMap(input []string) CoordByteMap {
|
|||||||
return ret
|
return ret
|
||||||
}
|
}
|
||||||
|
|
||||||
|
func (m *CoordByteMap) GetPos(x, y int) byte {
|
||||||
|
return m.Get(Coordinate{X: x, Y: y})
|
||||||
|
}
|
||||||
|
|
||||||
|
func (m *CoordByteMap) Get(pos Coordinate) byte {
|
||||||
|
if v, ok := m.Field[pos]; ok {
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
return 0
|
||||||
|
}
|
||||||
|
|
||||||
|
func (m *CoordByteMap) Opt(pos Coordinate, def byte) byte {
|
||||||
|
if v, ok := m.Field[pos]; ok {
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
return def
|
||||||
|
}
|
||||||
|
|
||||||
|
func (m *CoordByteMap) Put(pos Coordinate, val byte) {
|
||||||
|
if pos.X < m.TLX {
|
||||||
|
m.TLX = pos.X
|
||||||
|
}
|
||||||
|
if pos.Y < m.TLY {
|
||||||
|
m.TLY = pos.Y
|
||||||
|
}
|
||||||
|
if pos.X > m.BRX {
|
||||||
|
m.BRX = pos.X
|
||||||
|
}
|
||||||
|
if pos.Y > m.BRY {
|
||||||
|
m.BRY = pos.Y
|
||||||
|
}
|
||||||
|
m.Field[pos] = val
|
||||||
|
}
|
||||||
|
|
||||||
|
func (m *CoordByteMap) Delete(pos Coordinate) {
|
||||||
|
delete(m.Field, pos)
|
||||||
|
}
|
||||||
|
|
||||||
func (m *CoordByteMap) Height() int {
|
func (m *CoordByteMap) Height() int {
|
||||||
return m.BRY - m.TLY
|
return m.BRY - m.TLY
|
||||||
}
|
}
|
||||||
@ -223,39 +261,6 @@ func (m *CoordByteMap) Count(b byte) int {
|
|||||||
return ret
|
return ret
|
||||||
}
|
}
|
||||||
|
|
||||||
func (m *CoordByteMap) Get(pos Coordinate) byte {
|
|
||||||
if v, ok := m.Field[pos]; ok {
|
|
||||||
return v
|
|
||||||
}
|
|
||||||
return 0
|
|
||||||
}
|
|
||||||
|
|
||||||
func (m *CoordByteMap) Opt(pos Coordinate, def byte) byte {
|
|
||||||
if v, ok := m.Field[pos]; ok {
|
|
||||||
return v
|
|
||||||
}
|
|
||||||
return def
|
|
||||||
}
|
|
||||||
|
|
||||||
func (m *CoordByteMap) Put(pos Coordinate, val byte) {
|
|
||||||
if pos.X < m.TLX {
|
|
||||||
m.TLX = pos.X
|
|
||||||
}
|
|
||||||
if pos.Y < m.TLY {
|
|
||||||
m.TLY = pos.Y
|
|
||||||
}
|
|
||||||
if pos.X > m.BRX {
|
|
||||||
m.BRX = pos.X
|
|
||||||
}
|
|
||||||
if pos.Y > m.BRY {
|
|
||||||
m.BRY = pos.Y
|
|
||||||
}
|
|
||||||
m.Field[pos] = val
|
|
||||||
}
|
|
||||||
func (m *CoordByteMap) Delete(pos Coordinate) {
|
|
||||||
delete(m.Field, pos)
|
|
||||||
}
|
|
||||||
|
|
||||||
func (m *CoordByteMap) GrowNorth(size int, val byte) {
|
func (m *CoordByteMap) GrowNorth(size int, val byte) {
|
||||||
tlY := m.TLY - 1
|
tlY := m.TLY - 1
|
||||||
for x := m.TLX; x <= m.BRX; x++ {
|
for x := m.TLX; x <= m.BRX; x++ {
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user