Day 13 done

This commit is contained in:
Daniel Flanagan 2021-12-14 15:18:14 -06:00
parent 8b63de7df5
commit 908a4172bd
Signed by: lytedev
GPG key ID: 5B2020A0F9921EF4
2 changed files with 77 additions and 2 deletions

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@ -1,5 +1,8 @@
import std/[streams, sequtils, strutils, sugar, strformat, times, httpclient, os, options]
type
Lines* = seq[string]
const YEAR = getEnv("AOC_YEAR", "2021").parseInt()
proc getCookie(): string = "~/.advent-of-code-auth-cookie".expandTilde().readFile()
proc getCacheDir(): string = joinPath(expandTilde("~/.cache"), fmt"/aoc{YEAR}")
@ -22,7 +25,7 @@ proc toInts*(s: seq[string]): seq[int] = s.map(parseInt)
proc loadInputText*(day: int): string = day.inputFilePath().readFile().strip()
proc loadInput*(day: int): seq[string] =
proc loadInput*(day: int): Lines =
result = collect:
for l in day.inputStream().lines(): l
@ -48,11 +51,14 @@ proc doDay*[T](
var p1 = testInput.part1()
echo "Day ", day, " Part 1: ", p1, " (Expected: ", expectedPart1, ")"
doAssert p1 == expectedPart1
time(&"Day {day} Part 1"): echo day.inputLoader().part1()
when not defined(release):
var p2 = testInput.part2()
echo "Day ", day, " Part 2: ", p2, " (Expected: ", expectedPart2, ")"
doAssert p2 == expectedPart2
time(&"Day {day} Part 1"): echo day.inputLoader().part1()
time(&"Day {day} Part 2"): echo day.inputLoader().part2()
proc doDay*[T](

69
2021/nim/day13.nim Normal file
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@ -0,0 +1,69 @@
import ./common, std/[sequtils, algorithm, sugar, sets, strformat, strutils, tables]
type
Axis = enum X, Y
Points = HashSet[(int, int)]
Fold = (Axis, int)
Folds = seq[Fold]
proc parse(input: Lines): (Points, Folds) =
var parsingFolds = false
for l in input.mapIt it.strip:
if l == "": parsingFolds = true; continue
if not parsingFolds:
let coords = l.split(',').map parseInt
result[0].incl (coords[0], coords[1])
else:
result[1].add ((if l.contains 'x': X else: Y), l.split('=')[1].parseInt)
proc printPoints(points: Points): void =
var w, h = 0
for (x, y) in points:
w = max(w, x)
h = max(h, y)
var lines: Lines = @[]
for y in 0..h: lines.add(' '.repeat(w+1))
for (x, y) in points: lines[y][x] = '#'
for l in lines: echo l
proc doFold(points: Points, f: Fold): Points =
let (axis, n) = f
for (x, y) in points:
if (axis == X and x > n): result.incl((n - (x - n), y))
elif (axis == Y and y > n):
result.incl((x, n - (y - n)))
else: result.incl((x, y))
proc p1(input: Lines): int =
let (points, folds) = input.parse()
points.doFold(folds[0]).len()
proc p2(input: Lines): int =
let (points, folds) = input.parse()
folds.reduce((points: Points, fold) => points.doFold(fold), points).printPoints()
echo "You'll have to read this one on your own, captain."
const input = @[
"6,10",
"0,14",
"9,10",
"0,3",
"10,4",
"4,11",
"6,0",
"6,12",
"4,1",
"0,13",
"10,12",
"3,4",
"3,0",
"8,4",
"1,10",
"2,14",
"8,10",
"9,0",
"",
"fold along y=7",
"fold along x=5",
]
doDay 13, n => n.loadInput, p1, p2, (input, 17, 0)