Combine AoC Repos
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211
2015/day18/main.go
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2015/day18/main.go
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package main
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import (
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"bufio"
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"fmt"
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"os"
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"os/exec"
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"strconv"
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"strings"
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"time"
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)
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var lights [][]bool
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func main() {
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ticks := -1
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speed := 2
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var hideSim, lockedCorners bool
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for i := range os.Args {
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if os.Args[i] == "-help" {
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fmt.Println("Usage: day18 [-ticks=<num>] [-speed=<num>]")
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fmt.Println("\t-ticks=<num>\tSpecify how many iterations should be performed")
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fmt.Println("\t\t\t\tIf not manually set, run forever.")
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fmt.Println("\t-speed=<num>\tSpecify how many times/second we iterate")
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fmt.Println("\t-hide\t\tHide the actual simulation (for AoC)")
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fmt.Println("\t-lockcorners\t\tLock the corner lights 'on' (for AoC pt 2)")
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os.Exit(1)
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}
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if j := strings.Index(os.Args[i], "="); j > 0 {
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flagKey := os.Args[i][:j]
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flagVal := os.Args[i][j+1:]
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if flagKey == "-ticks" {
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ticks = mustAtoi(flagVal)
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} else if flagKey == "-speed" {
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speed = mustAtoi(flagVal)
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}
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}
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if os.Args[i] == "-hide" {
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hideSim = true
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}
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if os.Args[i] == "-lockcorners" {
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lockedCorners = true
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}
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}
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if hideSim && ticks == -1 {
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// Doesn't make sense to run this configuration
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fmt.Println("You asked to run indefinitely and hide the simulation...")
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fmt.Println("Refusing to needlessly consume your CPU.")
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os.Exit(1)
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}
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var input []string
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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input = append(input, scanner.Text())
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}
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for i := range input {
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var bldRow []bool
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for j := range input[i] {
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bldRow = append(bldRow, (input[i][j] == '#'))
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}
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lights = append(lights, bldRow)
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}
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if !hideSim {
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cls()
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printLights(lights)
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}
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for i := 0; i < ticks || ticks == -1; i++ {
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if lockedCorners {
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lights = lockCorners(lights)
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}
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lights = tick(lights)
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if lockedCorners {
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lights = lockCorners(lights)
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}
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if !hideSim {
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||||
cls()
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printLights(lights)
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}
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||||
if !hideSim {
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||||
// No reason to sleep if we're hiding the simulation
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time.Sleep(time.Second / time.Duration(speed))
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}
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}
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fmt.Println("After " + strconv.Itoa(ticks) + " ticks, " + strconv.Itoa(countLights(lights)) + " are on")
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}
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func lockCorners(c [][]bool) [][]bool {
|
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c[0][0] = true
|
||||
c[0][len(c[0])-1] = true
|
||||
c[len(c)-1][0] = true
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||||
c[len(c)-1][len(c[0])-1] = true
|
||||
return c
|
||||
}
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||||
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func cls() {
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||||
cmd := exec.Command("clear")
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||||
cmd.Stdout = os.Stdout
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||||
cmd.Run()
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||||
}
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||||
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func printLights(curr [][]bool) {
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||||
for i := range curr {
|
||||
for j := range curr {
|
||||
if curr[i][j] {
|
||||
fmt.Print("#")
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||||
} else {
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||||
fmt.Print(".")
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||||
}
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||||
}
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fmt.Println()
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||||
}
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||||
}
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func tick(curr [][]bool) [][]bool {
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||||
var next [][]bool
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||||
for i := range curr {
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||||
var bldRow []bool
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||||
for j := range curr[i] {
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num := checkNeighbors(curr, i, j)
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var newVal bool
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||||
if curr[i][j] {
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||||
// On proc
|
||||
if num == 2 || num == 3 {
|
||||
newVal = true
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||||
}
|
||||
} else {
|
||||
// Off proc
|
||||
if num == 3 {
|
||||
newVal = true
|
||||
}
|
||||
}
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||||
bldRow = append(bldRow, newVal)
|
||||
}
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||||
next = append(next, bldRow)
|
||||
}
|
||||
return next
|
||||
}
|
||||
|
||||
// Returns how many neighbors are on
|
||||
func checkNeighbors(curr [][]bool, i, j int) int {
|
||||
var ret int
|
||||
// nw
|
||||
if isOn(curr, (i - 1), (j - 1)) {
|
||||
ret++
|
||||
}
|
||||
// n
|
||||
if isOn(curr, (i - 1), j) {
|
||||
ret++
|
||||
}
|
||||
// ne
|
||||
if isOn(curr, (i - 1), (j + 1)) {
|
||||
ret++
|
||||
}
|
||||
// w
|
||||
if isOn(curr, i, (j - 1)) {
|
||||
ret++
|
||||
}
|
||||
// e
|
||||
if isOn(curr, i, (j + 1)) {
|
||||
ret++
|
||||
}
|
||||
// sw
|
||||
if isOn(curr, (i + 1), (j - 1)) {
|
||||
ret++
|
||||
}
|
||||
// s
|
||||
if isOn(curr, (i + 1), j) {
|
||||
ret++
|
||||
}
|
||||
// se
|
||||
if isOn(curr, (i + 1), (j + 1)) {
|
||||
ret++
|
||||
}
|
||||
return ret
|
||||
}
|
||||
|
||||
func isOn(curr [][]bool, i, j int) bool {
|
||||
if i < 0 || i >= len(curr) {
|
||||
return false
|
||||
}
|
||||
if j < 0 || j >= len(curr[i]) {
|
||||
return false
|
||||
}
|
||||
return curr[i][j]
|
||||
}
|
||||
|
||||
func countLights(c [][]bool) int {
|
||||
var ttl int
|
||||
for i := range c {
|
||||
for j := range c[i] {
|
||||
if c[i][j] {
|
||||
ttl++
|
||||
}
|
||||
}
|
||||
}
|
||||
return ttl
|
||||
}
|
||||
|
||||
func mustAtoi(s string) int {
|
||||
var i int
|
||||
var err error
|
||||
if i, err = strconv.Atoi(s); err != nil {
|
||||
fmt.Println("Tried to atoi " + s)
|
||||
os.Exit(1)
|
||||
}
|
||||
return i
|
||||
}
|
||||
180
2015/day18/problem
Normal file
180
2015/day18/problem
Normal file
@@ -0,0 +1,180 @@
|
||||
Advent of Code
|
||||
|
||||
br0xen 40*
|
||||
|
||||
• [About]
|
||||
• [Stats]
|
||||
• [Leaderboard]
|
||||
• [Settings]
|
||||
• [Log out]
|
||||
|
||||
--- Day 18: Like a GIF For Your Yard ---
|
||||
|
||||
After the million lights incident, the fire code has gotten stricter: now, at most ten thousand
|
||||
lights are allowed. You arrange them in a 100x100 grid.
|
||||
|
||||
Never one to let you down, Santa again mails you instructions on the ideal lighting
|
||||
configuration. With so few lights, he says, you'll have to resort to animation.
|
||||
|
||||
Start by setting your lights to the included initial configuration (your puzzle input). A #
|
||||
means "on", and a . means "off".
|
||||
|
||||
Then, animate your grid in steps, where each step decides the next configuration based on the
|
||||
current one. Each light's next state (either on or off) depends on its current state and the
|
||||
current states of the eight lights adjacent to it (including diagonals). Lights on the edge of
|
||||
the grid might have fewer than eight neighbors; the missing ones always count as "off".
|
||||
|
||||
For example, in a simplified 6x6 grid, the light marked A has the neighbors numbered 1 through
|
||||
8, and the light marked B, which is on an edge, only has the neighbors marked 1 through 5:
|
||||
|
||||
1B5...
|
||||
234...
|
||||
......
|
||||
..123.
|
||||
..8A4.
|
||||
..765.
|
||||
|
||||
The state a light should have next is based on its current state (on or off) plus the number of
|
||||
neighbors that are on:
|
||||
|
||||
• A light which is on stays on when 2 or 3 neighbors are on, and turns off otherwise.
|
||||
• A light which is off turns on if exactly 3 neighbors are on, and stays off otherwise.
|
||||
|
||||
All of the lights update simultaneously; they all consider the same current state before moving
|
||||
to the next.
|
||||
|
||||
Here's a few steps from an example configuration of another 6x6 grid:
|
||||
|
||||
Initial state:
|
||||
.#.#.#
|
||||
...##.
|
||||
#....#
|
||||
..#...
|
||||
#.#..#
|
||||
####..
|
||||
|
||||
After 1 step:
|
||||
..##..
|
||||
..##.#
|
||||
...##.
|
||||
......
|
||||
#.....
|
||||
#.##..
|
||||
|
||||
After 2 steps:
|
||||
..###.
|
||||
......
|
||||
..###.
|
||||
......
|
||||
.#....
|
||||
.#....
|
||||
|
||||
After 3 steps:
|
||||
...#..
|
||||
......
|
||||
...#..
|
||||
..##..
|
||||
......
|
||||
......
|
||||
|
||||
After 4 steps:
|
||||
......
|
||||
......
|
||||
..##..
|
||||
..##..
|
||||
......
|
||||
......
|
||||
|
||||
After 4 steps, this example has four lights on.
|
||||
|
||||
In your grid of 100x100 lights, given your initial configuration, how many lights are on after
|
||||
100 steps?
|
||||
|
||||
Your puzzle answer was 814.
|
||||
|
||||
--- Part Two ---
|
||||
|
||||
You flip the instructions over; Santa goes on to point out that this is all just an
|
||||
implementation of Conway's Game of Life. At least, it was, until you notice that something's
|
||||
wrong with the grid of lights you bought: four lights, one in each corner, are stuck on and
|
||||
can't be turned off. The example above will actually run like this:
|
||||
|
||||
Initial state:
|
||||
##.#.#
|
||||
...##.
|
||||
#....#
|
||||
..#...
|
||||
#.#..#
|
||||
####.#
|
||||
|
||||
After 1 step:
|
||||
#.##.#
|
||||
####.#
|
||||
...##.
|
||||
......
|
||||
#...#.
|
||||
#.####
|
||||
|
||||
After 2 steps:
|
||||
#..#.#
|
||||
#....#
|
||||
.#.##.
|
||||
...##.
|
||||
.#..##
|
||||
##.###
|
||||
|
||||
After 3 steps:
|
||||
#...##
|
||||
####.#
|
||||
..##.#
|
||||
......
|
||||
##....
|
||||
####.#
|
||||
|
||||
After 4 steps:
|
||||
#.####
|
||||
#....#
|
||||
...#..
|
||||
.##...
|
||||
#.....
|
||||
#.#..#
|
||||
|
||||
After 5 steps:
|
||||
##.###
|
||||
.##..#
|
||||
.##...
|
||||
.##...
|
||||
#.#...
|
||||
##...#
|
||||
|
||||
After 5 steps, this example now has 17 lights on.
|
||||
|
||||
In your grid of 100x100 lights, given your initial configuration, but with the four corners
|
||||
always in the on state, how many lights are on after 100 steps?
|
||||
|
||||
Your puzzle answer was 924.
|
||||
|
||||
Both parts of this puzzle are complete! They provide two gold stars: **
|
||||
|
||||
At this point, you should return to your advent calendar and try another puzzle.
|
||||
|
||||
If you still want to see it, you can get your puzzle input.
|
||||
|
||||
You can also [Shareon Twitter Google+ Reddit] this puzzle.
|
||||
|
||||
References
|
||||
|
||||
Visible links
|
||||
. http://adventofcode.com/
|
||||
. http://adventofcode.com/about
|
||||
. http://adventofcode.com/stats
|
||||
. http://adventofcode.com/leaderboard
|
||||
. http://adventofcode.com/settings
|
||||
. http://adventofcode.com/auth/logout
|
||||
. http://adventofcode.com/day/6
|
||||
. https://en.wikipedia.org/wiki/Conway's_Game_of_Life
|
||||
. http://adventofcode.com/
|
||||
. http://adventofcode.com/day/18/input
|
||||
. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Like+a+GIF+For+Your+Yard%22+%2D+Day+18+%2D+Advent+of+Code&url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F18&related=ericwastl&hashtags=AdventOfCode
|
||||
. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F18
|
||||
. http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F18&title=I%27ve+completed+%22Like+a+GIF+For+Your+Yard%22+%2D+Day+18+%2D+Advent+of+Code
|
||||
6
2015/day18/sample_input
Normal file
6
2015/day18/sample_input
Normal file
@@ -0,0 +1,6 @@
|
||||
.#.#.#
|
||||
...##.
|
||||
#....#
|
||||
..#...
|
||||
#.#..#
|
||||
####..
|
||||
Reference in New Issue
Block a user