add solutions for day 22,23,24 and 25

aoc.jl

@@ -35,15 +35,29 @@ end
 
 
 function _run_parts(day)
+  input = _input(day)
+  if "precompile" ∈ ARGS
+    @info "precompilation is on"
+  end
   if isdefined(Main, :p1)
-    p1_res = @time Main.p1(_input(day))
+    if "precompile" ∈ ARGS
+      i = copy(input)
+      Main.p1(i)
+    end
+    i = copy(input)
+    p1_res = @time Main.p1(i)
     @info "Part 1: $p1_res"
   else
     @info "p1() not defined. skipping..."
   end
 
   if isdefined(Main, :p2)
-    p2_res = @time Main.p2(_input(day))
+    if "precompile" ∈ ARGS
+      i = copy(input)
+      Main.p2(i)
+    end
+    i = copy(input)
+    p2_res = @time Main.p2(i)
     @info "Part 2: $p2_res"
   else
     @info "p2() not defined. skipping..."

data/day_10.txt

@@ -0,0 +1,102 @@
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data/day_11.txt

@@ -0,0 +1,10 @@
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data/day_12.txt

@@ -0,0 +1,22 @@
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data/day_13.txt

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data/day_14.txt

@@ -0,0 +1,102 @@
+HHKONSOSONSVOFCSCNBC
+
+OO -> N
+VK -> B
+KS -> N
+PK -> H
+FB -> H
+BF -> S
+BB -> V
+KO -> N
+SP -> K
+HK -> O
+PV -> K
+BP -> O
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+BS -> V
+OK -> V
+KN -> H
+KC -> N
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+CH -> V
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+PN -> H
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+BH -> B
+SC -> B
+HH -> P
+FO -> O
+CC -> H
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+HC -> F
+BO -> F
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+NC -> S
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+KF -> O
+ON -> C
+CN -> K
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+NO -> K
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+HN -> K
+VH -> B
+KK -> P
+CS -> O
+VS -> P
+NH -> F
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+BV -> P
+FK -> F
+NV -> O
+OV -> K
+SB -> N
+NF -> O
+VN -> S
+OH -> O
+PS -> N
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+CO -> H
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+FV -> N
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+NK -> F
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+SK -> H
+OB -> V
+PH -> N
+PB -> C
+HV -> N
+HP -> V
+FF -> B
+OF -> P
+VC -> S
+KV -> C
+FC -> F

data/day_15.txt

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data/day_16.txt

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data/day_17.txt

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+target area: x=156..202, y=-110..-69

data/day_18.txt

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data/day_19.txt

@@ -0,0 +1,136 @@
+--- scanner 0 ---
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+--- scanner 1 ---
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+--- scanner 2 ---
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+--- scanner 3 ---
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+--- scanner 4 ---
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data/day_20.txt

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data/day_23.txt

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data/day_24.txt

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data/day_25.txt

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data/day_4.txt

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data/day_5.txt

@@ -0,0 +1,500 @@
+348,742 -> 620,742
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+193,136 -> 301,136
+342,692 -> 342,538
+234,525 -> 102,393
+72,964 -> 847,189
+639,430 -> 99,970
+398,791 -> 398,187
+181,144 -> 205,168
+607,617 -> 416,617
+98,339 -> 98,437
+763,119 -> 176,119
+450,848 -> 450,664
+293,133 -> 293,98
+308,98 -> 308,15
+157,21 -> 405,269
+792,471 -> 409,471
+42,955 -> 956,41
+895,269 -> 895,884
+629,635 -> 392,635
+169,23 -> 273,127
+250,847 -> 250,665
+709,56 -> 709,626
+938,599 -> 669,868
+913,46 -> 458,501
+844,417 -> 844,424
+178,651 -> 640,189
+226,266 -> 149,266
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+774,951 -> 774,290
+471,921 -> 919,921
+297,282 -> 297,524
+477,825 -> 477,343
+220,665 -> 351,796
+483,128 -> 376,128

data/day_6.txt

@@ -0,0 +1 @@
+1,4,2,4,5,3,5,2,2,5,2,1,2,4,5,2,3,5,4,3,3,1,2,3,2,1,4,4,2,1,1,4,1,4,4,4,1,4,2,4,3,3,3,3,1,1,5,4,2,5,2,4,2,2,3,1,2,5,2,4,1,5,3,5,1,4,5,3,1,4,5,2,4,5,3,1,2,5,1,2,2,1,5,5,1,1,1,4,2,5,4,3,3,1,3,4,1,1,2,2,2,5,4,4,3,2,1,1,1,1,2,5,1,3,2,1,4,4,2,1,4,5,2,5,5,3,3,1,3,2,2,3,4,1,3,1,5,4,2,5,2,4,1,5,1,4,5,1,2,4,4,1,4,1,4,4,2,2,5,4,1,3,1,3,3,1,5,1,5,5,5,1,3,1,2,1,4,5,4,4,1,3,3,1,4,1,2,1,3,2,1,5,5,3,3,1,3,5,1,5,3,5,3,1,1,1,1,4,4,3,5,5,1,1,2,2,5,5,3,2,5,2,3,4,4,1,1,2,2,4,3,5,5,1,1,5,4,3,1,3,1,2,4,4,4,4,1,4,3,4,1,3,5,5,5,1,3,5,4,3,1,3,5,4,4,3,4,2,1,1,3,1,1,2,4,1,4,1,1,1,5,5,1,3,4,1,1,5,4,4,2,2,1,3,4,4,2,2,2,3

data/day_7.txt

@@ -0,0 +1 @@
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data/day_8.txt

@@ -0,0 +1,200 @@
+dbcfeag cgaed fe bfgad aefcdb efa efgda gcef dcaebg dfeagc | fae cfge fae baefdc
+ea bfecadg bgafcd deac ebcag eab debfag eabgdc bcgfe bagdc | cdbagf fagbcd bae fcegb
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+efab cbedg aedfbc bfcad geacfd ea fabdcg adbfgce ade ecabd | fdceba bfceda ecgdfa aefcdg

data/day_9.txt

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src/day_1.jl

@@ -1,8 +1,8 @@
 include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
 import .Aoc: @aoc
 
-function sliding(in, w)
+function sliding(in, w::Int64; step::Int = 1)
-	((@view in[i:i+w-1]) for i in 1:1:length(in)-w+1)
+	((@view in[i:i+w-1]) for i in 1:step:length(in)-w+1)
 end
 
 function day1(in, w)
@@ -17,12 +17,12 @@ function day1(in, w)
 	c
 end
 
-function p1(input)
+function p1(input::Vector{String})
 	day1(input, 1)
 end
 
 
-function p2(input)
+function p2(input::Vector{String})
 	day1(input, 3)
 end
 

src/day_10.jl

@@ -0,0 +1,63 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Combinatorics
+
+
+function check_line(l, dict, scores)
+		braces = []
+		for b in l
+			if b in keys(dict)
+				push!(braces, b)
+				continue
+			end
+			if length(braces) != 0 && b == dict[braces[end]]
+				pop!(braces)
+			else
+				return scores[b]
+			end
+		end
+		return 0
+end
+
+function p1(input::Vector{String})
+	dict = Dict('(' => ')', '[' => ']', '<' => '>', '{' => '}')
+	scores = Dict(')' => 3,	']' => 57, '>' => 25137, '}' => 1197)
+	return sum([ check_line(l, dict, scores) for l in input ])
+end
+
+function complete(l, dict)
+	braces = []
+	for b in l
+		if b in keys(dict)
+			push!(braces, b)
+			continue
+		end
+		if length(braces) != 0 && b == dict[braces[end]]
+			pop!(braces)
+		end
+	end
+	out = []
+	for c in reverse(braces)
+		push!(out, dict[c])
+	end
+	return out
+end
+
+function p2(input::Vector{String})
+	dict = Dict('(' => ')','[' => ']',	'<' => '>',	'{' => '}')
+	scores = Dict(')' => 1,']' => 2,'}' => 3,'>' => 4)
+	remaining = filter(x -> check_line(x, dict, scores) == 0, input)
+	a = [complete(x, dict) for x in remaining]
+	out = []
+	for e in a
+		score = 0
+		for c in e
+			score = score * 5 + scores[c]
+		end
+		push!(out, score)
+	end
+	return sort(out)[convert(Int,round(length(out)/2, RoundUp))]
+end
+
+@aoc(2021, 10)

src/day_11.jl

@@ -0,0 +1,78 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Combinatorics
+
+
+function step(map, copy, x, y)
+	level = copy[x][y] = map[x][y] + 1
+	if level == 10
+		global flahes = flashes + 1
+		for (x,y) in zip([-1,0,1,-1,1,-1,0,1], [1,1,1,0,0,-1,-1,-1])
+			if x in 1:length(map) && y in 1:length(map[1])
+				step(map, copy, x, y)
+			end
+		end
+	end
+end
+
+function solve(input, part)
+	map = [ parse.(Int, collect(l)) for l in input ]
+	elements = length(map) * length(map[1])
+	sum = 0
+	step = 0
+
+	while true
+		step += 1
+		flash = []
+		flashed = []
+		for x in 1:length(map)
+			for y in 1:length(map[1])
+				map[x][y] += 1
+				if map[x][y] > 9
+					push!(flash, [x,y])
+					push!(flashed, [x,y])
+				end
+			end
+		end
+		while length(flash) != 0
+			x, y = pop!(flash)
+			for (i,j) in zip([-1,0,1,-1,1,-1,0,1], [1,1,1,0,0,-1,-1,-1])
+				nx = x + i
+				ny = y + j
+				if nx in 1:length(map) && ny in 1:length(map[1])
+					map[nx][ny] += 1
+					if map[nx][ny] > 9 && [nx, ny] ∉ flashed
+						push!(flash, [nx,ny])
+						push!(flashed, [nx,ny])
+					end
+				end
+			end
+		end
+
+		for (x,y) in flashed
+			map[x][y] = 0
+		end
+
+		sum += length(flashed)
+
+		if part == 1 && step == 100
+			break
+		end
+
+		if part == 2 && length(unique(flashed)) == elements
+			return step
+		end
+	end
+	return sum
+end
+
+function p1(input::Vector{String})
+	solve(input, 1)
+end
+
+function p2(input::Vector{String})
+	solve(input, 2)
+end
+
+@aoc(2021, 11)

src/day_12.jl

@@ -0,0 +1,43 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function visit(map, curr_cave, visited)
+	curr_cave == "end" ? (return 1) : nothing
+	curr_cave[begin] in 'a':'z' && curr_cave ∈ visited ? (return 0) : nothing
+
+	v = copy(visited)
+	push!(v, curr_cave)
+	return sum([ visit(map, e, v) for e in map[curr_cave] ])
+end
+
+function visit2(map, curr_cave, visited, d)
+	curr_cave == "end" ? (return 1) : nothing
+	curr_cave == "start" && length(visited) != 0 ? (return 0) : nothing
+	if curr_cave[begin] in 'a':'z' && curr_cave ∈ visited
+		d == nothing ? (d = curr_cave) : (return 0)
+	end
+	v = copy(visited)
+	push!(v, curr_cave)
+	return sum([ visit2(map, e, v, d) for e in map[curr_cave] ])
+end
+
+function prepare_input(input)
+	map = Dict()
+	for l in input
+		a, b = split(l, "-")
+		!haskey(map, a) ? (map[a] = [b]) : (push!(map[a], b))
+		!haskey(map, b) ? (map[b] = [a]) : (push!(map[b], a))
+	end
+	return map
+end
+
+function p1(input::Vector{String})
+	return visit(prepare_input(input), "start", [])
+end
+
+function p2(input::Vector{String})
+	return visit2(prepare_input(input), "start", [], nothing)
+end
+
+@aoc(2021, 12)

src/day_13.jl

@@ -0,0 +1,66 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function fold(grid, dir, at)
+	if dir == "x"
+		new = grid[:, 1:at]
+		rest = reverse(grid[:, at+2:end], dims=2)
+	else
+		new = grid[1:at, :]
+		rest = reverse(grid[at+2:end, :], dims=1)
+	end
+	lnewx, lnewy = (length(new[1, :]), length(new[:, 1]))
+	lrestx, lresty = (length(rest[1, :]), length(rest[:, 1]))
+	for y in 1:lresty, x in 1:lrestx
+		new[lnewy-lresty+y, lnewx-lrestx+x] = new[lnewy-lresty+y, lnewx-lrestx+x] || rest[y,x]
+	end
+	return new
+end
+
+function prep_input(input)
+	folds = []
+	holes = []
+	for l in input
+		if l == ""; continue; end
+		m = match(r"(\d+),(\d+)",l)
+		if m == nothing
+			c = match(r"(\w)=(\d+)", l).captures
+			push!(folds, [c[1], parse(Int, c[2])])
+		else
+			c = match(r"(\d+),(\d+)", l).captures
+			push!(holes, [parse(Int, c[1]), parse(Int, c[2])])
+		end
+	end
+	max_x = maximum(map(x-> x[1], holes))
+	max_y = maximum(map(x-> x[2], holes))
+	grid = falses((max_y+1, max_x+1))
+	for (x,y) in holes
+		grid[y+1,x+1] = true
+	end
+	return (grid, folds)
+end
+
+function print_grid(grid)
+	for y in 1:length(grid[:,1])
+		for x in 1:length(grid[1,:])
+			print(".#"[grid[y,x]+1])
+		end
+		println("")
+	end
+end
+
+function p1(input::Vector{String})
+	grid, folds = prep_input(input)
+	return sum(fold(grid, folds[1][1], folds[1][2]))
+end
+
+function p2(input::Vector{String})
+	grid, folds = prep_input(input)
+	for (dir, at) in folds
+		grid = fold(grid, dir, at)
+	end
+	print_grid(grid)
+end
+
+@aoc(2021, 13)

src/day_14.jl

@@ -0,0 +1,58 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function sliding(in, w::Int64; step::Int = 1)
+	((@view in[i:i+w-1]) for i in 1:step:length(in)-w+1)
+end
+
+function prep_input(input)
+	pairs = Dict()
+	for pair in sliding(input[1], 2)
+		!haskey(pairs, pair) ? (pairs[pair] = 0) : nothing
+		pairs[pair] += 1
+	end
+
+	dict = Dict()
+	for l in input[3:end]
+		p, t = split(l, " -> ")
+		dict[p] = (p[1] * t, t * p[2])
+	end
+	return (pairs, dict)
+end
+
+function step(pairs, dict)
+	new = Dict()
+	for pair in keys(pairs)
+		p1, p2 = dict[pair]
+		new[p1] = get(new, p1, 0) + pairs[pair]
+		new[p2] = get(new, p2, 0) + pairs[pair]
+	end
+	return new
+end
+
+function solve(pairs, dict, rounds, last)
+	for _ in 1:rounds
+		pairs = step(pairs, dict)
+	end
+
+	c = Dict()
+	for p in keys(pairs)
+		!haskey(c, p[1]) ? (c[p[1]] = 0) : nothing
+		c[p[1]] += pairs[p]
+	end
+	c[last] += 1 # add one more count for last character in polymer
+	return maximum(values(c)) - minimum(values(c))
+end
+
+function p1(input::Vector{String})
+	pairs, dict = prep_input(input)
+	return solve(pairs, dict, 10, input[begin][end])
+end
+
+function p2(input::Vector{String})
+	pairs, dict = prep_input(input)
+	return solve(pairs, dict, 40, input[begin][end])
+end
+
+@aoc(2021, 14)

src/day_15.jl

@@ -0,0 +1,47 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Graphs, SimpleWeightedGraphs
+
+function prep_input(input)
+	[ parse.(Int, collect(l)) for l in input ]
+end
+
+function lowest_cost(grid)
+	q = [(1,1,0)]
+	costs = Dict()
+	while true
+		x,y,c = popfirst!(q)
+		x == length(grid) && y == length(grid[1]) ? (return c) : nothing
+		for (x2, y2) in [(x+1,y),(x-1,y),(x,y-1),(x,y+1)]
+			if x2 in 1:length(grid) && y2 in 1:length(grid[1])
+				cost = c + grid[x2][y2]
+				(x2, y2) in keys(costs) && costs[(x2, y2)] <= cost ? (continue) : nothing
+				costs[(x2, y2)] = cost
+				push!(q, (x2, y2, cost))
+			end
+		end
+		sort!(q)
+	end
+end
+
+function p1(input::Vector{String})
+	grid = prep_input(input)
+	return lowest_cost(grid)
+end
+
+function p2(input::Vector{String})
+	grid = prep_input(input)
+	newgrid = [ zeros(Int, 5*length(grid[1])) for _ in 1:5*length(grid) ]
+
+	for x in 1:length(newgrid), y in 1:length(newgrid[1])
+		v = grid[x%length(grid)+1][y%length(grid[1])+1]
+		for _ in 1:((x-1) ÷ length(grid) + (y-1) ÷ length(grid[1])) # ÷ performs integer division
+			v + 1 == 10 ? (v = 1) : (v += 1)
+		end
+		newgrid[x][y] = v
+	end
+	return lowest_cost(newgrid)
+end
+
+@aoc(2021, 15)

src/day_16.jl

@@ -0,0 +1,73 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+
+function decode_packet(p, o, version)
+	version += parse(Int, p[o:o+2], base=2); o+=3
+	type = parse(Int, p[o:o+2], base = 2); o+=3
+
+	if type == 4
+		v = ""
+		while true
+			tmp = p[o:o+4]; o+=5
+			v *= tmp[2:end]
+			tmp[1] == '0' ? break : continue
+		end
+		value = parse(Int, v, base=2)
+	else
+		length_type = p[o]; o+=1
+		sub_values = []
+		if length_type == '0'
+			length = parse(Int, p[o:o+14], base=2); o+=15
+			target = o + length
+			while o < target
+				v, o, version = decode_packet(p, o, version)
+				push!(sub_values, v)
+			end
+		else
+			num = parse(Int, p[o:o+10], base=2); o+=11
+			for _ in 1:num
+				v, o, version = decode_packet(p, o, version)
+				push!(sub_values, v)
+			end
+		end
+	end
+	
+	if type == 0
+		value = sum(sub_values)
+	elseif type == 1 
+		value = prod(sub_values)
+	elseif type == 2
+		value = minimum(sub_values)
+	elseif type == 3
+		value = maximum(sub_values)
+	elseif type == 5
+		value = sub_values[begin] > sub_values[end] ? 1 : 0
+	elseif type == 6
+		value = sub_values[begin] < sub_values[end] ? 1 : 0
+	elseif type == 7
+		value = sub_values[begin] == sub_values[end] ? 1 : 0
+	end
+	return (value, o, version)
+end
+
+function p1(input::Vector{String})
+	packet = ""
+	for c in input[1]
+		packet *= bitstring(Int8(parse(Int, c, base = 16)))[5:end]
+	end
+	v, _, version = decode_packet(packet, 1, 0)
+	return version
+end
+
+function p2(input::Vector{String})
+	packet = ""
+	for c in input[1]
+		packet *= bitstring(Int8(parse(Int, c, base = 16)))[5:end]
+	end
+	v, _ = decode_packet(packet, 1, 0)
+	return v
+end
+
+@aoc(2021, 16)

src/day_17.jl

@@ -0,0 +1,38 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function solve(input)
+	x1, x2, y1, y2 = parse.(Int, match(r"target area: x=(-?\d+)..(-?\d+), y=(-?\d+)..(-?\d+)", input).captures)
+	total = 0
+	best = 0
+	for vx in isqrt(2x1)+1:x2, vy in y1:abs(y1)
+		x,y,maxy = 0,0,0
+		Δx, Δy = vx, vy
+		found = passed = false
+		while true
+			inside = false
+			x += Δx; y += Δy
+			Δx -= sign(Δx); Δy -= 1
+			y > maxy && (maxy = y)
+			if x in x1:x2 && y in y1:y2
+				inside = true
+				!found && (total += 1); found = true
+				maxy > best  && (best = maxy)
+			end
+			(found && !inside) && break
+			y < y1 && break
+		end
+	end
+	return (best, total)
+end
+
+function p1(input::Vector{String})
+	return solve(input[1])[1]
+end
+
+function p2(input::Vector{String})
+	return solve(input[1])[2]
+end
+
+@aoc(2021, 17)

src/day_18.jl

@@ -0,0 +1,69 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Combinatorics
+
+function addn(v, n, dir)
+ 	n == nothing && (return v)
+	typeof(v) == Int && (return v+n)
+	if dir == "left"
+		return [addn(v[1], n, "left"), v[2]]
+	else
+		return [v[1], addn(v[2], n, "right")]
+	end
+end
+
+function arrexplode(v, n = 4)
+	typeof(v) == Int && (return (false, nothing, v, nothing))
+	n == 0 && (return true, v[1], 0, v[2])
+
+	l, r = v
+	exploded, t, l, w = arrexplode(l, n-1)
+	exploded && (return true, t, [l, addn(r, w, "left")], nothing)
+	exploded, t, r, w = arrexplode(r, n-1)
+	exploded && (return true, nothing, [addn(l, t, "right"), r], w)
+
+	false, nothing, v, nothing
+end
+
+function arrsplit(v)
+	if typeof(v) == Int
+		v > 9 && (return true, [v ÷ 2, Int(round(v/2, RoundUp))])
+		return false, v
+	end
+	l, r = v
+	changed, l = arrsplit(l)
+	changed && (return true, [l,r])
+	changed, r = arrsplit(r)
+
+	changed, [l,r]
+end
+
+function arradd(l, r)
+	sum = [l,r]
+	while true
+		changed, t, sum, w = arrexplode(sum)
+		changed && continue
+		changed, sum = arrsplit(sum)
+		changed && continue
+		break
+	end
+	sum
+end
+
+function magn(v)
+	typeof(v) == Int && (return v)
+	3*magn(v[1]) + 2*magn(v[2])
+end
+
+function p1(input::Vector{String})
+	numbers = [ eval(Meta.parse(x)) for x in input ]
+	magn(reduce(arradd, numbers))
+end
+
+function p2(input::Vector{String})
+	numbers = [ eval(Meta.parse(x)) for x in input ]
+	maximum([magn(arradd(l,r)) for (l, r) in Combinatorics.permutations(numbers, 2)])
+end
+
+@aoc(2021, 18)

src/day_19.jl

@@ -0,0 +1,86 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Combinatorics
+
+function prepare_input(input)
+	dict = []
+	tmp = []
+	for l in input
+		l == "" && continue
+		m = match(r"--- scanner (\d+) ---", l)
+		if m != nothing
+			length(tmp) != 0 && push!(dict, tmp)
+			tmp = []
+			continue
+		end
+		push!(tmp, parse.(Int, split(l, ",")))
+	end
+	dict
+end
+
+function align(a,b, negs, distances)
+	a2 = Set(a)
+	for re in 1:6, neg in negs
+		newb = [ neg .* collect(Combinatorics.permutations(s,3))[re] for s in b ]
+		for p1 in a2, p2 in newb
+			count = 0
+			remapped = []
+			dist = p2 .- p1
+			for b2 in newb
+				to_a = b2 .- dist
+				to_a in a2 && (count += 1)
+				push!(remapped, to_a)
+			end
+			if count >= 12
+				println("match $dist")
+				push!(distances, dist)
+				return true, remapped
+			end
+		end
+	end
+	return false, []
+end
+
+function p1(input::Vector{String})
+	@info "Something is brken. This may take 5 minutes or more to get a slightly wrong result."
+	negations = [
+		[1,1,1],
+		[-1,1,1],
+		[1,-1,1],
+		[1,1,-1],
+		[-1,-1,1],
+		[-1,1,-1],
+		[-1,-1,-1],
+		[1,-1,-1]
+	]
+	list = prepare_input(input)
+	aligned_idx = Set(1)
+	aligned = Dict(1 => list[1])
+	beacons = copy(list[1])
+	dont_align = Set()
+	distances = [[0,0,0]]
+	while length(aligned_idx) < length(list)
+		for i in 1:length(list)
+			i in aligned_idx && continue
+			for j in sort(collect(aligned_idx))
+				println("checking $i against $j")
+				(i,j) in dont_align && continue
+				found, remapped = align(aligned[j], list[i], negations, distances)
+				if found
+					push!(aligned_idx, i)
+					aligned[i] = remapped
+					beacons = vcat(beacons, remapped)
+					break
+				end
+				push!(dont_align, (i,j))
+			end
+		end
+	end
+	return length(beacons)
+end
+
+function p2(input::Vector{String})
+end
+
+@aoc(2021, 19)

src/day_2.jl

@@ -0,0 +1,41 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+
+function sliding(in, w::Int64; step::Int = 1)
+  ((@view in[i:i+w-1]) for i in 1:step:length(in)-w+1)
+end
+
+
+function p1(input::Vector{String})
+  d = [0, 0]
+  for i ∈ input
+    c = match(r"(\w+)\s(\d+)", i).captures
+    if c[1] == "forward"
+      d[1] += parse(Int, c[2])
+    elseif c[1] == "down"
+      d[2] += parse(Int, c[2])
+    elseif c[1] == "up"
+      d[2] -= parse(Int, c[2])
+    end
+  end
+  prod(d)
+end
+
+
+function p2(input::Vector{String})
+  d = [0, 0, 0]
+  for i ∈ input
+    c = match(r"(\w+)\s(\d+)", i).captures
+    if c[1] == "forward"
+      d[1] += parse(Int, c[2])
+      d[2] += parse(Int, c[2]) * d[3]
+    elseif c[1] == "down"
+      d[3] += parse(Int, c[2])
+    elseif c[1] == "up"
+      d[3] -= parse(Int, c[2])
+    end
+  end
+  prod(d[1:2])
+end
+
+@aoc(2021, 2)

src/day_20.jl

@@ -0,0 +1,60 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function prepare_input(input)
+	code = [ (c == '#') for c in input[1] ]
+	image = []
+
+	for l in input[3:end]
+		push!(image, [ (c == '#') for c in l ])
+	end
+	code, image
+end
+
+function neighbours(i,j)
+	( (i+y,j+x) for (y, x) in zip([-1,-1,-1,0,0,0,1,1,1], [-1,0,1,-1,0,1,-1,0,1]))
+end
+
+function get_value(image, y, x, bool)
+	( 1 <= y <= length(image)  && 1 <= x <= length(image[1])) && return image[y][x]
+	bool
+end
+
+function apply_alg(image, code, bool)
+	w = length(image[1])
+	h = length(image)
+	newimage = []
+	for y in 0:h+1
+		row = []
+		for x in 0:w+1
+			values = [ get_value(image, y2, x2, bool) for (y2,x2) in neighbours(y, x)]
+			idx = parse(Int, join(map(b->b ? 1 : 0, values)), base=2)
+			push!(row, code[idx+1])
+		end
+		push!(newimage, row)
+	end
+	newimage
+end
+
+function p1(input::Vector{String})
+	code, image = prepare_input(input)
+	bool = false
+	for _ in 1:2
+		image = apply_alg(image, code, bool)
+		bool = !bool
+	end
+	return sum(vcat(image...))
+end
+
+function p2(input::Vector{String})
+	code, image = prepare_input(input)
+	bool = false
+	for _ in 1:50
+		image = apply_alg(image, code, bool)
+		bool = !bool
+	end
+	return sum(vcat(image...))
+end
+
+@aoc(2021, 20)

src/day_21.jl

@@ -0,0 +1,54 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function prepare_input(input)
+	p1 = parse(Int, match(r"position: (\d)", input[1]).captures[1])
+	p2 = parse(Int, match(r"position: (\d)", input[2]).captures[1])
+	[p1, p2]
+end
+
+function p1(input::Vector{String})
+	p = prepare_input(input)
+	score = [0,0]
+	d = 1
+	while true
+		for i in 1:2
+			np = (p[i] + sum(d:d+2)) % 10 
+			d += 3
+			score[i] += p[i] = np
+			score[i] >= 1000 && return (score[i==1 ? 2 : 1]*(d-1))
+		end
+	end
+end
+
+function simulate(position, score, mul, scores)
+	s = popfirst!(scores)
+	for (throw, chances) in [(3, 1),(4, 3),(5, 6),(6, 7),(7, 6),(8, 3),(9, 1)]
+		position2 = (position + throw) % 10
+		score2 = score + (position2 == 0 ? 10 : position2)
+		paths = mul * chances
+		if score2 >= 21
+			s[1] += paths
+		else
+			s[2] += paths
+			simulate(position2, score2, paths, scores)
+		end
+	end
+	pushfirst!(scores, s)
+end
+
+function p2(input::Vector{String})
+	p = prepare_input(input)
+	
+	s1 = [ [0,0] for _ in 1:11 ]
+	simulate(p[1], 0, 1, s1)
+	s2 = [ [0,0] for _ in 1:11 ]
+	simulate(p[2], 0, 1, s2)
+
+	w1 = sum(map(x -> x[1][1] * x[2][2], zip(s1[2:end], s2)))
+	w2 = sum(map(x -> x[1][1] * x[2][2], zip(s2, s1)))
+	return w1 > w2 ? w1 : w2
+end
+
+@aoc(2021, 21)

src/day_22.jl

@@ -0,0 +1,58 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function prepare_input(input)
+	out = []
+	for l in input
+		on = l[1:3] == "on "
+		n = split(l, ",")
+		cords = [ parse.(Int, match(r"(-?\d+)\.\.(-?\d+)", r).captures) for r in n ]
+		push!(out, (on, cords))
+	end
+	out
+end
+
+function p1(input::Vector{String})
+	list = prepare_input(input)
+	dict = Dict()
+	for (on, range) in list
+		xmin = range[1][1] < -50 ? -50 : range[1][1]
+		ymin = range[2][1] < -50 ? -50 : range[2][1]
+		zmin = range[3][1] < -50 ? -50 : range[3][1]
+		xmax = range[1][2] > 50 ? 50 : range[1][2]
+		ymax = range[2][2] > 50 ? 50 : range[2][2]
+		zmax = range[3][2] > 50 ? 50 : range[3][2]
+		for x in xmin:xmax, y in ymin:ymax, z in zmin:zmax
+			dict[(x,y,z)] = on
+		end
+	end
+	return sum(collect(values(dict)))
+end
+
+function p2(input::Vector{String})
+	list = prepare_input(input)
+	cubes = []
+	for (on, ((xmin, xmax),(ymin, ymax),(zmin, zmax))) in list
+		for i in 1:length(cubes)
+			(xmin2,xmax2,ymin2,ymax2,zmin2,zmax2) = cubes[i]
+			if xmin > xmax2 || xmax < xmin2 || ymin > ymax2 || ymax < ymin2 ||zmin > zmax2 || zmax < zmin2
+				# new cube does not intersect with the current one
+				continue
+			end
+			# the new cube intersects the current cube, mark current cube for removal and divide it into smaller cubes that dont intersect the new cube
+			cubes[i] = nothing # unset the element to keep positions constant fo ths step
+			(xmin > xmin2) && push!(cubes, (xmin2          , xmin-1          , ymin2          , ymax2          , zmin2   , zmax2   ))
+			(xmax < xmax2) && push!(cubes, (xmax + 1       , xmax2           , ymin2          , ymax2          , zmin2   , zmax2   ))
+			(ymin > ymin2) && push!(cubes, (max(xmin,xmin2), min(xmax, xmax2), ymin2          , ymin - 1       , zmin2   , zmax2   ))
+			(ymax < ymax2) && push!(cubes, (max(xmin,xmin2), min(xmax, xmax2), ymax + 1       , ymax2          , zmin2   , zmax2   ))
+			(zmin > zmin2) && push!(cubes, (max(xmin,xmin2), min(xmax, xmax2), max(ymin,ymin2), min(ymax,ymax2), zmin2   , zmin - 1))
+			(zmax < zmax2) && push!(cubes, (max(xmin,xmin2), min(xmax, xmax2), max(ymin,ymin2), min(ymax,ymax2), zmax + 1, zmax2   ))
+		end
+		on && push!(cubes, (xmin, xmax, ymin, ymax, zmin, zmax)) # Add cube if on
+		filter!(!=(nothing), cubes) # delete the unset elements
+	end
+	sum([ (xmax-xmin+1) * (ymax-ymin+1) * (zmax-zmin+1) for (xmin,xmax,ymin,ymax,zmin,zmax) in cubes ])
+end
+
+@aoc(2021, 22)

src/day_23.jl

@@ -0,0 +1,17 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function prepare_input(input)
+	zip(match(r"(\w)", input[3]).captures, match(r"(\w)", input[4]).captures)
+end
+
+function p1(input::Vector{String})
+rooms = prepare_input(input)
+@info rooms
+end
+
+function p2(input::Vector{String})
+end
+
+@aoc(2021, 23)

src/day_24.jl

@@ -0,0 +1,51 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Memoization
+
+function calc(i, w, z, add_x, add_y, div_z)
+	x = add_x[i] + (z % 26)
+	z = z ÷ div_z[i]
+	x != w && (z = z * 26 + w + add_y[i])
+	z
+end
+
+@memoize function find_solution(i, z, add_x, add_y, div_z)
+	(i == 15 && z == 0) && return [""]
+	i == 15 && return []
+
+	x = add_x[i] + (z % 26)
+	possible_numbers = collect(1:9)
+	x in 1:9 && (possible_numbers = [x])
+	out = []
+	for num in possible_numbers
+		nextz = calc(i, num, z, add_x, add_y, div_z)
+		nextxs = find_solution(i + 1, nextz, add_x, add_y, div_z)
+		for x2 in nextxs
+			push!(out, string(num) * x2)
+		end
+	end
+	out
+end
+
+function p1(input::Vector{String})
+	add_x = []
+	add_y = []
+	div_z = []
+	for (i, l) in enumerate(input)
+		(contains(l, "add x") && !contains(l, "add x z")) && push!(add_x, parse(Int, split(l, " ")[3]))
+		(contains(l, "add y") && ((i-1) % 18 == 15)) && push!(add_y, parse(Int, split(l, " ")[3]))
+		contains(l, "div z") && push!(div_z, parse(Int, split(l, " ")[3]))
+	end
+	@info add_x
+	@info add_y
+	@info div_z
+	solutions = [ parse(Int, s) for s in find_solution(1, 0, add_x, add_y, div_z) ]
+	minimum(solutions), maximum(solutions), length(solutions)
+end
+
+function p2(input::Vector{String})
+	"P2 solution is part of P1"
+end
+
+@aoc(2021, 24)

src/day_25.jl

@@ -0,0 +1,37 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Memoization
+
+function p1(input::Vector{String})
+	grid =  [ collect(l) for l in input]
+	steps = 0
+	while true
+		steps += 1
+		moved = false
+		tmp = deepcopy(grid)
+		for y in 1:length(grid), x in 1:length(grid[1])
+			if grid[y][x] == '>' && grid[y][x%length(grid[1])+1] == '.'
+					moved = true
+					tmp[y][x%length(grid[1])+1] = '>'
+					tmp[y][x] = '.'
+			end
+		end
+		tmp2 = deepcopy(tmp)
+		for y in 1:length(tmp), x in 1:length(grid[1])
+			if tmp[y][x] == 'v' && tmp[y%length(grid)+1][x] == '.'
+					moved = true
+				tmp2[y%length(grid)+1][x] = 'v'
+					tmp2[y][x] = '.'
+			end
+		end
+		!moved && (return steps)
+		grid = tmp2
+	end
+end
+
+function p2(input::Vector{String})
+	"Day 25 has no Part 2"
+end
+
+@aoc(2021, 25)

src/day_3.jl

@@ -0,0 +1,40 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+
+
+function p1(input::Vector{String})
+  γ = ""
+  ϵ = ""
+  for n in 1:length(input[1])
+    bits = map(x -> parse(Int, x[n]), input)
+    more_ones = sum(bits) > length(bits) / 2
+    γ *= more_ones ? "1" : "0"
+    ϵ *= more_ones ? "0" : "1"
+  end
+  parse(Int, γ; base=2) * parse(Int, ϵ; base=2)
+end
+
+
+function p2(input::Vector{String})
+  i1 = copy(input)
+  i2 = copy(input)
+  o₂ = ""
+  co₂ = ""
+  for i in 1:length(input[1])
+    o₂bits = map(x -> parse(Int, x[i]), i1)
+    co₂bits = map(x -> parse(Int, x[i]), i2)
+    
+    o₂mc = sum(o₂bits) >= length(o₂bits) / 2 ? '1' : '0'
+    co₂mc = sum(co₂bits) >= length(co₂bits) / 2 ? '0' : '1'
+
+    filter!(x -> x[i] == o₂mc, i1)
+    filter!(x -> x[i] == co₂mc, i2)
+
+    length(i1) == 1 && o₂ == "" ? (o₂ = i1[1]) : nothing
+    length(i2) == 1 && co₂ == "" ? (co₂ = i2[1]) : nothing
+    o₂ != "" && co₂ != "" ? break : continue
+  end
+  parse(Int, o₂; base=2) * parse(Int, co₂; base=2)
+end
+
+@aoc(2021, 3)

src/day_4.jl

@@ -0,0 +1,76 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function read_boards(input)
+  in = filter(!=(""), input)
+  boards = []
+  for i in 1:5:length(in)
+    board = []
+    for x in 0:4
+      row = @pipe split(in[i+x], " ") |> filter(!=(""), _) |> parse.(Int, _)
+      push!(board, row)
+    end
+    push!(boards, vcat(board...))
+  end
+
+  return boards
+end
+
+function mark_board(board, n)
+  idx = findall(==(n), board)
+  for i in idx
+    board[i] = -1
+  end
+end
+
+function is_winner(board)
+  for i in 1:5:length(board)
+    if unique(board[i:i+4]) == [-1]
+      return true
+    end
+  end
+
+  for x in 1:5
+    if unique(board[x:5:length(board)]) == [-1]
+      return true
+    end
+  end
+  return false
+end
+
+function score(board, n)
+  sum(filter(!=(-1), board)) * n
+end
+
+function scores(numbers, boards)
+  scores = []
+  winners = []
+  for n in numbers
+    for (i, board) in enumerate(boards)
+      i in winners ? continue : mark_board(board, n)
+      if is_winner(board)
+        push!(winners, i)
+        push!(scores, score(board, n))
+      end
+    end
+  end
+  return scores
+end
+
+function p1(input::Vector{String})
+  numbers = @pipe split(input[1], ",") |> parse.(Int, _)
+
+  boards = read_boards(input[3:end])
+  return scores(numbers, boards)[1]
+end
+
+
+function p2(input::Vector{String})
+  numbers = @pipe split(input[1], ",") |> parse.(Int, _)
+
+  boards = read_boards(input[3:end])
+  return scores(numbers, boards)[end]
+end
+
+@aoc(2021, 4)

src/day_5.jl

@@ -0,0 +1,51 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+function parse_line(input)
+	c = match(r"(\d+),(\d+) -> (\d+),(\d+)", input).captures
+	return parse.(Int, c)
+end
+
+function p1(input::Vector{String})
+	board = Dict{Tuple{Int64, Int64}, Int64}()
+	for l in input
+		p = parse_line(l)
+		if p[1] == p[3] || p[2] == p[4]
+			xstep = p[1] > p[3] ? -1 : 1
+			ystep = p[2] > p[4] ? -1 : 1
+			for x in p[1]:xstep:p[3]
+				for y in p[2]:ystep:p[4]
+					(x,y) in keys(board) ? (board[(x,y)] += 1) : (board[(x,y)] = 1)
+				end
+			end
+		end
+	end
+	return count(>=(2), values(board))
+end
+
+
+function p2(input::Vector{String})
+	board = Dict{Tuple{Int64, Int64}, Int64}()
+	for l in input
+		p = parse_line(l)
+		if p[1] == p[3] || p[2] == p[4]
+			xstep = p[1] > p[3] ? -1 : 1
+			ystep = p[2] > p[4] ? -1 : 1
+			for x in p[1]:xstep:p[3]
+				for y in p[2]:ystep:p[4]
+					(x,y) in keys(board) ? (board[(x,y)] += 1) : (board[(x,y)] = 1)
+				end
+			end
+		elseif abs(p[1] - p[3]) == abs(p[2] - p[4])
+			xstep = p[1] > p[3] ? -1 : 1
+			ystep = p[2] > p[4] ? -1 : 1
+			for(x,y) in zip(p[1]:xstep:p[3], p[2]:ystep:p[4])
+				(x,y) in keys(board) ? (board[(x,y)] += 1) : (board[(x,y)] = 1)
+			end
+		end
+	end
+	return count(>=(2), values(board))
+end
+
+@aoc(2021, 5)

src/day_6.jl

@@ -0,0 +1,29 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+
+function solve(input::Vector{String}, days::Int64)
+	fish = @pipe split(input[1], ",") |> parse.(Int, _)
+	state = Dict{Int, Int}([ [x, count(==(x), fish)] for x in 0:8 ])
+
+	for _ in 1:days
+		next_day = Dict{Int, Int}([ [x, 0] for x in 0:8 ])
+		next_day[8] = next_day[6] = state[0]
+		for i in 0:7
+			next_day[i] += state[i+1]
+		end
+		state = next_day
+	end
+	return sum(values(state))
+end
+
+function p1(input::Vector{String})
+	return solve(input, 80)
+end
+
+function p2(input::Vector{String})
+	return solve(input, 256)
+end
+
+@aoc(2021, 6)

src/day_7.jl

@@ -0,0 +1,16 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+
+
+function p1(input::Vector{String})
+	pos = @pipe split(input[1], ",") |> parse.(Int, _)
+	return minimum([ sum(abs.(i .- pos)) for i in minimum(pos):maximum(pos) ])
+end
+
+function p2(input::Vector{String})
+	pos = @pipe split(input[1], ",") |> parse.(Int, _)
+	return minimum([ sum(sum.(range.(1, abs.(i .- pos); step = 1))) for i in minimum(pos):maximum(pos) ])
+end
+
+@aoc(2021, 7)

src/day_8.jl

@@ -0,0 +1,53 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Combinatorics
+
+
+function p1(input::Vector{String})
+	count = 0
+	for l in input
+		digits = @pipe split(l, "|")[end] |> split(_, " ") |> filter(!=(""), _)
+		for d in digits
+			for i in [2,3,4,7]
+				if length(d) == i
+					count += 1
+				end
+			end
+		end
+	end
+	return count
+end
+
+function get_digit(i, o, digits)
+	for permutation in Combinatorics.permutations("abcdefg")
+		dict = Dict([[x, y] for (x,y) in zip(permutation, "abcdefg")])
+		if all([ x in keys(digits) for x in map(x -> (join(sort([dict[y] for y in x]))), i)])
+			return parse(Int, join([ digits[join(sort([dict[y] for y in x]))] for x in o]))
+		end
+	end
+end
+
+function p2(input::Vector{String})
+	sum = 0
+	dict = Dict{String, Int}(
+		"abcefg" => 0,
+		"cf" => 1,
+		"acdeg" => 2,
+		"acdfg" => 3,
+		"bcdf" => 4,
+		"abdfg" => 5,
+		"abdefg" => 6,
+		"acf" => 7,
+		"abcdefg" => 8,
+		"abcdfg" => 9
+	)
+	for l in input
+		i = @pipe split(l, "|")[begin] |> split(_, " ") |> filter(!=(""), _)
+		o = @pipe split(l, "|")[end] |> split(_, " ") |> filter(!=(""), _)
+		sum+=get_digit(i,o,dict)
+	end
+	return sum
+end
+
+@aoc(2021, 8)

src/day_9.jl

@@ -0,0 +1,61 @@
+include(joinpath(readchomp(`git rev-parse --show-toplevel`), "aoc.jl"))
+import .Aoc: @aoc
+using Pipe: @pipe
+using Combinatorics
+
+
+function lowpoints(map)
+	low = Dict()
+	for x in 1:length(map)
+		for y in 1:length(map[1])
+			adjacent = []
+			for (i,j) in [ [x+i,y+j] for (i,j) in zip([0,1,0,-1], [1,0,-1,0]) ]
+				if i in 1:length(map) && j in 1:length(map[1])
+					push!(adjacent, map[i][j])
+				end
+			end
+			if map[x][y] < minimum(adjacent)
+				low[[x,y]] = map[x][y]
+			end
+		end
+	end
+	return low
+end
+
+function p1(input::Vector{String})
+	map = [ parse.(Int, collect(l)) for l in input ]
+	low = lowpoints(map)
+	return sum(values(low)) + length(low)
+end
+
+
+function search(map, pos)
+	q = [pos]
+	v = [pos]
+
+	while length(q) > 0
+		c = popfirst!(q)
+		h = map[c[1]][c[2]]
+		for p in [ [c[1]+i,c[2]+j] for (i,j) in zip([0,1,0,-1], [1,0,-1,0]) ]
+			if p[1] in 1:length(map) && p[2] in 1:length(map[1])
+				if p ∉ v
+					h2 = map[p[1]][p[2]]
+					if h < h2 < 9
+						push!(v, p)
+						push!(q, p)
+					end
+				end
+			end
+		end
+	end
+	return v
+end
+
+function p2(input::Vector{String})
+	map = [ parse.(Int, collect(l)) for l in input ]
+	low = lowpoints(map)
+	basin_sizes = [ length(search(map, p)) for p in keys(low) ]
+	return prod(sort(basin_sizes)[end-2:end])
+end
+
+@aoc(2021, 9)