day11 p2

more efficient way to model > 2 knots

day1/day1.jl

@@ -1,30 +1,48 @@
 #!/usr/bin/env julia
 
-infile = size(ARGS, 1) > 0 ? ARGS[1] : "day1input.txt"
+using Test
-Ns = size(ARGS, 1) > 1 ? ARGS[2] : "1"
-println("infile = ", infile)
 
-N = parse(Int64, Ns)
+function elf_max_calories(infile)
+  max_calories = zeros(Int64, 3)
+  elf_calories = 0
 
-max_calories = zeros(Int64, N)
+  open(infile, "r") do io
-elf_calories = 0
+    for line in eachline(io)
-i = 1
+      if length(line) == 0
-
+        if elf_calories > max_calories[1]
-io = open(infile, "r")
+          max_calories[1] = elf_calories
-for line in eachline(io)
+          sort!(max_calories)
-  global i, max_calories, max_elf_idx, elf_calories
+        end
-  if length(line) == 0
+        elf_calories = 0
+        continue
+      end
+      snack_calories = parse(Int64, line)
+      elf_calories += snack_calories
+    end
     if elf_calories > max_calories[1]
       max_calories[1] = elf_calories
       sort!(max_calories)
     end
-    i += 1
-    elf_calories = 0
-    continue
   end
-  snack_calories = parse(Int64, line)
+
-  elf_calories += snack_calories
+  return (max_calories[end], sum(max_calories))
 end
 
-println(max_calories)
+function test()
-println(sum(max_calories))
+  @testset "elf snacks" verbose=true begin
+    @test elf_max_calories("example.txt") == (24000, 45000)
+    @test elf_max_calories("input.txt") == (69206, 197400)
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    println("snack calories: ", elf_max_calories(infile))
+  end
+end
+
+main()

day1/src/main.rs

@@ -46,13 +46,13 @@ where P: AsRef<Path>, {
 }
 
 fn main() {
-    aoc_day1("day1input.txt", 1);
+    aoc_day1("input.txt", 1);
 }
 
 #[test]
 fn day1input() {
-    assert_eq!(aoc_day1("day1input.txt", 1), 69206);
+    assert_eq!(aoc_day1("input.txt", 1), 69206);
-    assert_eq!(aoc_day1("day1input.txt", 3), 197400);
+    assert_eq!(aoc_day1("input.txt", 3), 197400);
 }
 
 #[test]

day10/day10.jl

@@ -0,0 +1,104 @@
+#!/usr/bin/env julia
+
+using Test
+
+mutable struct Instruction
+  cycles :: UInt
+  add    :: Int
+end
+
+function parse_instruction_line(line)
+  parts = split(line, limit=2)
+  if parts[1] == "noop"
+    return Instruction(1, 0)
+  elseif parts[1] == "addx"
+    return Instruction(2, parse(Int, parts[2]))
+  else
+    throw(DomainError("Unknown instruction: " * line))
+  end
+end
+
+function signal_strength_sum(io; end_cycle=220)
+  X :: Int = 1
+  cycle :: Int = 1
+  signal_strength_sum :: Int = 0
+  next_test_cycle = 20
+  for line in eachline(io)
+    if mod(cycle - 20, 40) == 0 && cycle <= end_cycle
+      println(cycle, " ", X)
+      signal_strength_sum += cycle * X
+      next_test_cycle += 40
+    end
+    inst = parse_instruction_line(line)
+    new_cycle = cycle + inst.cycles
+    if new_cycle > next_test_cycle
+      signal_strength_sum += next_test_cycle * X
+      next_test_cycle += 40
+    end
+    cycle = new_cycle
+    X += inst.add
+  end
+  println("last inst cycle ", cycle)
+  signal_strength_sum += X * sum(filter(x -> x >= cycle, 20:40:end_cycle))
+  return signal_strength_sum
+end
+
+function get_crt(io; end_cycle=240)
+  X :: Int = 2 # Note: add 1 to simplify 1-based indexing
+  pending_instruction :: Union{Instruction, Nothing} = nothing
+  screen = fill('.', (Int(ceil(end_cycle / 40)), 40))
+  nrows, ncols = size(screen)
+  for i in 1:nrows
+    for j in 1:ncols
+      if abs(X - j) <= 1
+        screen[i, j] = "#"[1]
+      else 
+        screen[i, j] = '.'
+      end
+
+      if pending_instruction === nothing
+        if eof(io)
+          continue
+        end
+        inst = parse_instruction_line(readline(io))
+        pending_instruction = inst
+      end
+      pending_instruction.cycles -= 1
+      if pending_instruction.cycles == 0
+        X += pending_instruction.add
+        pending_instruction = nothing
+      end
+    end
+  end
+  return join(reduce(*, screen, dims=2, init=""), "\n")
+end
+
+function test()
+  @testset "signal strength sum" verbose=true begin
+    @test signal_strength_sum("example.txt") == 13140
+    @test signal_strength_sum("input.txt") == 13220
+  end
+  @testset "crt test" verbose=true begin
+    open("example.txt") do io
+      @test get_crt(io) == chomp(read("example_crt.txt", String))
+    end
+    open("input.txt") do io
+      @test get_crt(io) == chomp(read("input_crt.txt", String))
+    end
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    println("signal strength sum = ", signal_strength_sum(infile))
+    open(infile, "r") do io
+      println(get_crt(io))
+    end
+  end
+end
+
+main()

day10/example.txt

@@ -0,0 +1,146 @@
+addx 15
+addx -11
+addx 6
+addx -3
+addx 5
+addx -1
+addx -8
+addx 13
+addx 4
+noop
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx -35
+addx 1
+addx 24
+addx -19
+addx 1
+addx 16
+addx -11
+noop
+noop
+addx 21
+addx -15
+noop
+noop
+addx -3
+addx 9
+addx 1
+addx -3
+addx 8
+addx 1
+addx 5
+noop
+noop
+noop
+noop
+noop
+addx -36
+noop
+addx 1
+addx 7
+noop
+noop
+noop
+addx 2
+addx 6
+noop
+noop
+noop
+noop
+noop
+addx 1
+noop
+noop
+addx 7
+addx 1
+noop
+addx -13
+addx 13
+addx 7
+noop
+addx 1
+addx -33
+noop
+noop
+noop
+addx 2
+noop
+noop
+noop
+addx 8
+noop
+addx -1
+addx 2
+addx 1
+noop
+addx 17
+addx -9
+addx 1
+addx 1
+addx -3
+addx 11
+noop
+noop
+addx 1
+noop
+addx 1
+noop
+noop
+addx -13
+addx -19
+addx 1
+addx 3
+addx 26
+addx -30
+addx 12
+addx -1
+addx 3
+addx 1
+noop
+noop
+noop
+addx -9
+addx 18
+addx 1
+addx 2
+noop
+noop
+addx 9
+noop
+noop
+noop
+addx -1
+addx 2
+addx -37
+addx 1
+addx 3
+noop
+addx 15
+addx -21
+addx 22
+addx -6
+addx 1
+noop
+addx 2
+addx 1
+noop
+addx -10
+noop
+noop
+addx 20
+addx 1
+addx 2
+addx 2
+addx -6
+addx -11
+noop
+noop
+noop

day10/example_crt.txt

@@ -0,0 +1,6 @@
+##..##..##..##..##..##..##..##..##..##..
+###...###...###...###...###...###...###.
+####....####....####....####....####....
+#####.....#####.....#####.....#####.....
+######......######......######......####
+#######.......#######.......#######.....

day10/input.txt

@@ -0,0 +1,137 @@
+noop
+noop
+addx 5
+addx 3
+addx -2
+noop
+addx 5
+addx 4
+noop
+addx 3
+noop
+addx 2
+addx -17
+addx 18
+addx 3
+addx 1
+noop
+addx 5
+noop
+addx 1
+addx 2
+addx 5
+addx -40
+noop
+addx 5
+addx 2
+addx 3
+noop
+addx 2
+addx 3
+addx -2
+addx 2
+addx 2
+noop
+addx 3
+addx 5
+addx 2
+addx 3
+addx -2
+addx 2
+addx -24
+addx 31
+addx 2
+addx -33
+addx -6
+addx 5
+addx 2
+addx 3
+noop
+addx 2
+addx 3
+noop
+addx 2
+addx -1
+addx 6
+noop
+noop
+addx 1
+addx 4
+noop
+noop
+addx -15
+addx 20
+noop
+addx -23
+addx 27
+noop
+addx -35
+addx 1
+noop
+noop
+addx 5
+addx 11
+addx -10
+addx 4
+addx 1
+noop
+addx 2
+addx 2
+noop
+addx 3
+noop
+addx 3
+addx 2
+noop
+addx 3
+addx 2
+addx 11
+addx -4
+addx 2
+addx -38
+addx -1
+addx 2
+noop
+addx 3
+addx 5
+addx 2
+addx -7
+addx 8
+addx 2
+addx 2
+noop
+addx 3
+addx 5
+addx 2
+addx -25
+addx 26
+addx 2
+addx 8
+addx -1
+addx 2
+addx -2
+addx -37
+addx 5
+addx 3
+addx -1
+addx 5
+noop
+addx 22
+addx -21
+addx 2
+addx 5
+addx 2
+addx 13
+addx -12
+addx 4
+noop
+noop
+addx 5
+addx 1
+noop
+noop
+addx 2
+noop
+addx 3
+noop
+noop

day10/input_crt.txt

@@ -0,0 +1,6 @@
+###..#..#..##..#..#.#..#.###..####.#..#.
+#..#.#..#.#..#.#.#..#..#.#..#.#....#.#..
+#..#.#..#.#..#.##...####.###..###..##...
+###..#..#.####.#.#..#..#.#..#.#....#.#..
+#.#..#..#.#..#.#.#..#..#.#..#.#....#.#..
+#..#..##..#..#.#..#.#..#.###..####.#..#.

day11/day11.jl

@@ -0,0 +1,115 @@
+#!/usr/bin/env julia
+
+using Test
+
+mutable struct Monkey
+  index :: UInt
+  items :: Vector{Int}
+  op :: Function
+  op_value :: Int
+  test_divisor :: Int
+  test_result :: NTuple{2, UInt}
+  inspected :: Int
+end
+
+function parse_monkey(text)
+  lines = split(text, '\n')
+  # Monkey 0:
+  match_index = match(r"Monkey (\d+):", lines[1])
+  index = parse(UInt, match_index.captures[1])
+  #   Starting items: 79, 98
+  match_items = match(r" *Starting items: (.*)", lines[2])
+  items_list = split(match_items.captures[1], ", ")
+  items = parse.(Int, items_list)
+  #   Operation: new = old * 19
+  match_op = match(r" *Operation: new = old (.) (old|\d+)", lines[3])
+  if match_op.captures[1] == "+"
+    op = +
+  elseif match_op.captures[1] == "*"
+    op = *
+  else
+    throw(DomainError("Unknown op: " * match_op.captures[1]))
+  end
+  if match_op.captures[2] == "old"
+    op = ^
+    op_value = 2
+  else
+    op_value = parse(Int, match_op.captures[2])
+  end
+  #   Test: divisible by 13
+  match_test = match(r" *Test: divisible by (\d+)", lines[4])
+  test_divisor = parse(Int, match_test.captures[1])
+  #   If true: throw to monkey 1
+  #   If false: throw to monkey 3
+  match_true = match(r" *If true: throw to monkey (\d+)", lines[5])
+  match_false = match(r" *If false: throw to monkey (\d+)", lines[6])
+  test_result = (parse(UInt, match_true.captures[1]) + 1,
+                 parse(UInt, match_false.captures[1]) + 1)
+  return Monkey(index, items, op, op_value, test_divisor, test_result, 0)
+end
+
+function read_monkeys(infile)
+  open(infile) do io
+    monkey_strings = split(read(io, String), "\n\n")
+    return parse_monkey.(monkey_strings)
+  end
+end
+
+function simian_shenanigans(monkeys :: Vector{Monkey}; part=1)
+  modulus = prod(m.test_divisor for m in monkeys)
+  for m in monkeys
+    for item in m.items
+      new_value = m.op(item, m.op_value)
+      if part == 1
+        new_value = Int(floor(new_value / 3))
+      else
+        new_value = mod(new_value, modulus)
+      end
+      new_monkey = (mod(new_value, m.test_divisor) == 0
+                    ? m.test_result[1] : m.test_result[2])
+      push!(monkeys[new_monkey].items, new_value)
+      m.inspected += 1
+    end
+    empty!(m.items)
+  end
+end
+
+function monkey_business(monkeys; rounds=20, part=1)
+  for _ in 1:rounds
+    simian_shenanigans(monkeys, part=part)
+  end
+  return prod(sort([m.inspected for m in monkeys])[end-1:end])
+end
+
+function test()
+  @testset "monkey business 1" verbose=true begin
+    @test monkey_business(read_monkeys("example.txt")) == 10605
+    @test monkey_business(read_monkeys("input.txt")) == 64032
+  end
+  @testset "monkey business 2" verbose=true begin
+    @test monkey_business(
+            read_monkeys("example.txt"), rounds=10000, part=2) == 2713310158
+    @test monkey_business(
+            read_monkeys("input.txt"), rounds=10000, part=2) == 12729522272
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    monkeys = read_monkeys(infile)
+    display(monkeys)
+    println()
+    println("monkey business 1 ",
+            monkey_business(monkeys, rounds=20, part=1))
+
+    monkeys = read_monkeys(infile)
+    println("monkey business 2 ",
+            monkey_business(monkeys, rounds=10000, part=2))
+  end
+end
+
+main()

day11/example.txt

@@ -0,0 +1,27 @@
+Monkey 0:
+  Starting items: 79, 98
+  Operation: new = old * 19
+  Test: divisible by 23
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 54, 65, 75, 74
+  Operation: new = old + 6
+  Test: divisible by 19
+    If true: throw to monkey 2
+    If false: throw to monkey 0
+
+Monkey 2:
+  Starting items: 79, 60, 97
+  Operation: new = old * old
+  Test: divisible by 13
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 74
+  Operation: new = old + 3
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 1

day11/input.txt

@@ -0,0 +1,55 @@
+Monkey 0:
+  Starting items: 83, 88, 96, 79, 86, 88, 70
+  Operation: new = old * 5
+  Test: divisible by 11
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 59, 63, 98, 85, 68, 72
+  Operation: new = old * 11
+  Test: divisible by 5
+    If true: throw to monkey 4
+    If false: throw to monkey 0
+
+Monkey 2:
+  Starting items: 90, 79, 97, 52, 90, 94, 71, 70
+  Operation: new = old + 2
+  Test: divisible by 19
+    If true: throw to monkey 5
+    If false: throw to monkey 6
+
+Monkey 3:
+  Starting items: 97, 55, 62
+  Operation: new = old + 5
+  Test: divisible by 13
+    If true: throw to monkey 2
+    If false: throw to monkey 6
+
+Monkey 4:
+  Starting items: 74, 54, 94, 76
+  Operation: new = old * old
+  Test: divisible by 7
+    If true: throw to monkey 0
+    If false: throw to monkey 3
+
+Monkey 5:
+  Starting items: 58
+  Operation: new = old + 4
+  Test: divisible by 17
+    If true: throw to monkey 7
+    If false: throw to monkey 1
+
+Monkey 6:
+  Starting items: 66, 63
+  Operation: new = old + 6
+  Test: divisible by 2
+    If true: throw to monkey 7
+    If false: throw to monkey 5
+
+Monkey 7:
+  Starting items: 56, 56, 90, 96, 68
+  Operation: new = old + 7
+  Test: divisible by 3
+    If true: throw to monkey 4
+    If false: throw to monkey 1

day3/day3.jl

@@ -0,0 +1,70 @@
+#!/usr/bin/env julia
+
+using Test
+
+function priority(char)
+  v = Int(char)
+  if v <= Int('Z')
+    return v - Int('A') + 27
+  else
+    return v - Int('a') + 1
+  end
+end
+
+function rucksack_errors(infile)
+  psum = 0
+
+  open(infile, "r") do io
+    for line in eachline(io)
+      n = length(line)
+      a = Set{Int32}()
+      b = Set{Int32}()
+      for c in line[1:Int(n/2)]
+        push!(a, priority(c))
+      end
+      for c in line[Int(n/2)+1:n]
+        push!(b, priority(c))
+      end
+      psum += pop!(intersect(a, b))
+    end
+  end
+
+  return psum
+end
+
+function rucksack_badges(infile)
+  psum = 0
+
+  open(infile, "r") do io
+    for lines in Iterators.partition(eachline(io), 3)
+      all = intersect!(Set(lines[1]), Set(lines[2]), Set(lines[3]))
+      psum += priority(pop!(all))
+    end
+  end
+
+  return psum
+end
+
+
+function test()
+  @testset "elf rucksack errors" verbose=true begin
+    @test rucksack_errors("example.txt") == 157
+    @test rucksack_errors("input.txt") == 8394
+  end
+  @testset "elf rucksack badges" verbose=true begin
+    @test rucksack_badges("example.txt") == 70
+    @test rucksack_badges("input.txt") == 2413
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    println("error priority sum: ", rucksack_errors(infile))
+  end
+end
+
+main()

day3/example.txt

@@ -0,0 +1,6 @@
+vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw

day3/input.txt

@@ -0,0 +1,300 @@
+gtZDjBcmpcDgpZcmmbgtdtqmCGVCGGsvhCFCCqvmCMMM
+JrhfzfLTNfJhPnhQnfzHfCFFQFSGvMFCGQFsQSMSVs
+TllTRrfNNlfzwhtZBZgtRDBp
+vMdwjZdjwjvjdTZZvCcQMGnQMQcbcgLLCL
+rsVhfmssPWzDVGCLJSbCgPLSQG
+lfWNDHDgfszFRTFtwwNjdv
+GLPqVqdVGCLCdczjMjzMfzld
+JnWQvJDmvWBtlMzhrzfHQgcz
+tDtJDDDDtWRRmBwJwWtpPRsGCGScLPGSqspNCS
+ChVzZzfNDzNJmBQfjjJfmH
+MrTMPMncGMJvPPvPWTbrMWvgmBgQwgdpwmdpdpjwpHQcdw
+SPvvvbqrFvMvZzJzsFVzVJNV
+mvBbvMFqbMMVVmtCBHpDdDPTDspdNWPDVP
+zjSfftcQtwtSfQSpNDppsNsjPNdRPP
+fgfStJShrgvvCLLv
+GmFnNNwbFFbhQQGQnGwwwfBgnMMqVDBZVVBMfMVzVz
+vWzRRHzTHcgfZDVfBgfH
+SSTvrvRcPpcvjFGwNGbNpbwQwz
+FFgbZZFZgFmpstLgmbtzqNrwVPlMPlSWWrMPNp
+QQhTvjhcvjjvTcTcTfCcSRwwWzwzPMrzWNNWVVhwrwWq
+GRQBfCRnGGTcDvBfGvffCCjnFZtFFgStJLbLHbFLJZdgmd
+pppdjcrMMRDJLJdRcwRDrwssqHGGDHsZHHsvBVtvmVHV
+nlCFWzGzzQFlSlhGWnPzFbSsBZmsssmVVmsBvnHqvNVqqm
+lFTTTCSQSTrdGJJLJG
+jpsGMgsmghQwQsMmhlQshjtTNTRTnFqRWnnqRfFnnt
+SLBCHrcvZHbSvSZrSvSWnfvVNvftVlFRTqnRTq
+JrzdZbBcHBCrrlHrrSsMgmGpJPDPQmpgQgPG
+cmcZHgwgMgHSLmtjLfWPNNrWBNfffp
+JTqGTsClHslVVRVCVGVJGnBrjdnnrdBNvjPNBNBrWvnW
+VVlQlqTFJlzzlsVGsRCZMthHDbwbFhgcbwHchg
+qgZjgjjbssqgsjlNqjhTtdrfQdTdWLLnDVfHtHWd
+zcGMBDDzcLnztfQQQz
+JSppJcBScMmMFFBRCpRCMmGlggvjhbhlNlglwbslCZjhDZ
+hvhmqcqwwcTBvvwQnRQnRnTRFzFzQz
+jWLPPtPsgMtpdLMLWllpgLLQFQhFJjnVrzFrVFhnRzJJrJ
+WPWffgtSdspdhSMdlSdtfBbHmSvqbNBCCmcBmcvcCH
+frVcrVcggfSZJfbbJvBd
+hwWQnwhWQmQmThTSsdvvSMBTBzcb
+wGnFFCGlQwntGtCtwntwDmFwRgLrHqNRqqcNNgRrHHLggCjp
+wRSwwHDMsRGHvNBNjTgvjgJD
+mcLcFCclWQWQpPQWVQcQcvvNJjrNBTrvgJgBvTRvCg
+VFPbQLchQLSRfbMtdHGH
+lfVrhnlRRqrJZVDJdHSWCvJCJSbj
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day4/day4.jl

@@ -0,0 +1,77 @@
+#!/usr/bin/env julia
+
+using Test
+
+function parse_line_ranges(line)
+  parts = split(line, ',')
+  ranges = Vector{UnitRange{Int64}}()
+  for p in parts
+    start, stop = split(p, '-', limit=2)
+    prange = UnitRange(parse(Int64, start), parse(Int64, stop))
+    push!(ranges, prange)
+  end
+  return ranges
+end
+
+function line_range_contained(line)
+  ranges = parse_line_ranges(line)
+  inter = intersect(ranges[1], ranges[2])
+  return (inter == ranges[1] || inter == ranges[2])
+end
+
+function line_range_overlap(line)
+  ranges = parse_line_ranges(line)
+  inter = intersect(ranges[1], ranges[2])
+  return length(inter) > 0
+end
+
+function count_range_contained(infile)
+  rsum = 0
+
+  open(infile, "r") do io
+    for line in eachline(io)
+      if line_range_contained(line)
+        rsum += 1
+      end
+    end
+  end
+
+  return rsum
+end
+
+function count_range_overlap(infile)
+  osum = 0
+
+  open(infile, "r") do io
+    for line in eachline(io)
+      if line_range_overlap(line)
+        osum += 1
+      end
+    end
+  end
+
+  return osum
+end
+
+function test()
+  @testset "elf cleaning contained" verbose=true begin
+    @test count_range_contained("example.txt") == 2
+    @test count_range_contained("input.txt") == 500
+  end
+  @testset "elf cleaning overlap" verbose=true begin
+    @test count_range_overlap("example.txt") == 4
+    @test count_range_overlap("input.txt") == 815
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    println("bad assignments: ", count_range_contained(infile))
+  end
+end
+
+main()

day4/example.txt

@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8

day5/day5.jl

@@ -0,0 +1,97 @@
+#!/usr/bin/env julia
+
+using Test
+
+function parse_stacks_line(line)
+  parts = Iterators.partition(line, 4)
+  return [s[2] for s in parts]
+end
+
+function read_stacks(io)
+  stacks = Vector{Vector{Char}}()
+  for line in eachline(io)
+    if isempty(line)
+      return stacks
+    end
+    if line[1:3] == " 1 "
+      continue
+    end
+    stacks_row = parse_stacks_line(line)
+    while length(stacks_row) > length(stacks)
+      push!(stacks, [])
+    end
+    for (i, c) in Iterators.enumerate(stacks_row)
+      if c == ' '
+        continue
+      end
+      pushfirst!(stacks[i], c)
+    end
+  end
+  return stacks
+end
+
+struct Move
+  count :: Int
+  from :: Int
+  to :: Int
+end
+
+function parse_move_line(line)
+  # move 1 from 2 to 1
+  parts = split(line)
+  return Move(parse(Int, parts[2]), parse(Int, parts[4]), parse(Int, parts[6]))
+end
+
+function read_apply_moves(stacks, io; rev::Bool = true)
+  for line in eachline(io)
+    move = parse_move_line(line)
+    if rev
+      for i in 1:move.count
+        push!(stacks[move.to], pop!(stacks[move.from]))
+      end
+    else
+      from_len = length(stacks[move.from])
+      from_range = UnitRange(from_len - move.count + 1, from_len)
+      append!(stacks[move.to], splice!(stacks[move.from], from_range))
+    end
+  end
+  return stacks
+end
+
+function operate_crane(infile; rev::Bool = true)
+  open(infile, "r") do io
+    stacks = read_stacks(io)
+    stacks2 = read_apply_moves(stacks, io, rev=rev)
+    return stacks2
+  end
+end
+
+function top_crates(stacks)
+  return join([last(s) for s in stacks])
+end
+
+function test()
+  @testset "elf crates 2000" verbose=true begin
+    @test top_crates(operate_crane("example.txt")) == "CMZ"
+    @test top_crates(operate_crane("input.txt")) == "QNHWJVJZW"
+  end
+  @testset "elf crates 2001" verbose=true begin
+    @test top_crates(operate_crane("example.txt", rev=false)) == "MCD"
+    @test top_crates(operate_crane("input.txt", rev=false)) == "BPCZJLFJW"
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    println("crates: ", read_stacks(infile))
+    stacks2 = operate_crane(infile)
+    println("after : ", stacks2)
+    println("top   : ", top_crates(stacks2))
+  end
+end
+
+main()

day5/example.txt

@@ -0,0 +1,9 @@
+    [D]    
+[N] [C]    
+[Z] [M] [P]
+ 1   2   3 
+
+move 1 from 2 to 1
+move 3 from 1 to 3
+move 2 from 2 to 1
+move 1 from 1 to 2

day5/input.txt

@@ -0,0 +1,511 @@
+[V]         [T]         [J]        
+[Q]         [M] [P]     [Q]     [J]
+[W] [B]     [N] [Q]     [C]     [T]
+[M] [C]     [F] [N]     [G] [W] [G]
+[B] [W] [J] [H] [L]     [R] [B] [C]
+[N] [R] [R] [W] [W] [W] [D] [N] [F]
+[Z] [Z] [Q] [S] [F] [P] [B] [Q] [L]
+[C] [H] [F] [Z] [G] [L] [V] [Z] [H]
+ 1   2   3   4   5   6   7   8   9 
+
+move 2 from 1 to 7
+move 6 from 2 to 6
+move 10 from 7 to 6
+move 4 from 3 to 1
+move 5 from 6 to 4
+move 1 from 1 to 9
+move 4 from 6 to 9
+move 12 from 4 to 1
+move 5 from 1 to 4
+move 7 from 9 to 8
+move 11 from 8 to 1
+move 6 from 6 to 2
+move 2 from 5 to 2
+move 3 from 6 to 3
+move 4 from 9 to 4
+move 2 from 2 to 5
+move 1 from 6 to 4
+move 3 from 3 to 6
+move 1 from 8 to 4
+move 1 from 6 to 1
+move 28 from 1 to 4
+move 28 from 4 to 5
+move 1 from 9 to 1
+move 4 from 4 to 1
+move 2 from 6 to 2
+move 2 from 1 to 6
+move 7 from 4 to 2
+move 14 from 2 to 9
+move 1 from 4 to 1
+move 1 from 1 to 2
+move 18 from 5 to 6
+move 2 from 2 to 6
+move 1 from 9 to 7
+move 8 from 9 to 2
+move 15 from 6 to 5
+move 1 from 6 to 3
+move 3 from 2 to 5
+move 1 from 7 to 5
+move 2 from 1 to 3
+move 3 from 2 to 1
+move 1 from 6 to 4
+move 5 from 6 to 5
+move 2 from 2 to 9
+move 35 from 5 to 7
+move 4 from 9 to 3
+move 1 from 4 to 1
+move 5 from 1 to 7
+move 6 from 5 to 3
+move 1 from 9 to 4
+move 11 from 7 to 6
+move 2 from 9 to 2
+move 1 from 4 to 7
+move 14 from 7 to 4
+move 5 from 6 to 9
+move 2 from 2 to 4
+move 6 from 7 to 9
+move 2 from 9 to 5
+move 6 from 9 to 5
+move 8 from 4 to 9
+move 5 from 4 to 3
+move 3 from 5 to 7
+move 1 from 3 to 9
+move 5 from 3 to 4
+move 7 from 9 to 8
+move 2 from 7 to 4
+move 4 from 5 to 7
+move 1 from 5 to 3
+move 5 from 6 to 4
+move 8 from 4 to 8
+move 5 from 7 to 6
+move 1 from 4 to 7
+move 3 from 6 to 9
+move 2 from 6 to 5
+move 7 from 8 to 3
+move 2 from 5 to 9
+move 17 from 3 to 1
+move 3 from 1 to 3
+move 6 from 8 to 9
+move 4 from 4 to 7
+move 6 from 3 to 5
+move 2 from 8 to 5
+move 14 from 7 to 5
+move 2 from 4 to 5
+move 6 from 9 to 5
+move 1 from 7 to 9
+move 1 from 6 to 9
+move 8 from 1 to 9
+move 8 from 5 to 2
+move 2 from 1 to 3
+move 7 from 2 to 6
+move 2 from 3 to 4
+move 1 from 2 to 6
+move 3 from 1 to 6
+move 16 from 9 to 4
+move 2 from 9 to 8
+move 1 from 1 to 6
+move 2 from 9 to 4
+move 1 from 6 to 9
+move 1 from 6 to 1
+move 1 from 1 to 7
+move 1 from 6 to 9
+move 1 from 9 to 3
+move 1 from 3 to 8
+move 1 from 9 to 2
+move 1 from 2 to 7
+move 2 from 5 to 3
+move 7 from 5 to 8
+move 2 from 7 to 9
+move 1 from 6 to 7
+move 3 from 6 to 9
+move 10 from 8 to 7
+move 1 from 4 to 3
+move 3 from 3 to 1
+move 1 from 7 to 1
+move 19 from 4 to 6
+move 3 from 9 to 7
+move 1 from 9 to 2
+move 2 from 1 to 7
+move 1 from 9 to 1
+move 12 from 6 to 9
+move 2 from 7 to 1
+move 1 from 2 to 4
+move 11 from 6 to 3
+move 1 from 4 to 8
+move 1 from 6 to 8
+move 11 from 7 to 9
+move 2 from 8 to 9
+move 18 from 9 to 6
+move 5 from 3 to 7
+move 5 from 3 to 8
+move 11 from 5 to 6
+move 26 from 6 to 4
+move 1 from 6 to 5
+move 1 from 3 to 7
+move 3 from 8 to 3
+move 1 from 8 to 7
+move 3 from 3 to 6
+move 5 from 9 to 3
+move 1 from 4 to 9
+move 8 from 4 to 5
+move 2 from 7 to 8
+move 3 from 3 to 6
+move 3 from 4 to 6
+move 7 from 7 to 4
+move 1 from 9 to 1
+move 5 from 5 to 3
+move 2 from 9 to 7
+move 3 from 8 to 2
+move 7 from 3 to 7
+move 1 from 7 to 6
+move 3 from 5 to 6
+move 7 from 4 to 8
+move 10 from 4 to 5
+move 2 from 4 to 2
+move 3 from 7 to 5
+move 2 from 4 to 1
+move 6 from 8 to 5
+move 5 from 1 to 4
+move 5 from 4 to 2
+move 5 from 7 to 8
+move 10 from 2 to 8
+move 3 from 8 to 3
+move 2 from 5 to 3
+move 13 from 6 to 1
+move 19 from 5 to 3
+move 12 from 3 to 9
+move 4 from 8 to 2
+move 2 from 6 to 7
+move 5 from 8 to 7
+move 9 from 3 to 9
+move 1 from 5 to 9
+move 2 from 7 to 6
+move 3 from 2 to 3
+move 15 from 9 to 3
+move 13 from 3 to 5
+move 1 from 6 to 2
+move 5 from 5 to 8
+move 1 from 2 to 5
+move 1 from 7 to 6
+move 6 from 9 to 6
+move 6 from 6 to 8
+move 4 from 7 to 1
+move 2 from 3 to 6
+move 11 from 1 to 9
+move 1 from 2 to 3
+move 4 from 5 to 6
+move 1 from 1 to 6
+move 10 from 9 to 2
+move 8 from 2 to 3
+move 3 from 1 to 2
+move 8 from 3 to 1
+move 5 from 5 to 4
+move 1 from 9 to 8
+move 2 from 3 to 7
+move 2 from 4 to 5
+move 6 from 1 to 6
+move 9 from 8 to 1
+move 16 from 1 to 9
+move 2 from 7 to 3
+move 3 from 3 to 8
+move 6 from 9 to 6
+move 1 from 5 to 4
+move 1 from 3 to 8
+move 5 from 2 to 1
+move 5 from 1 to 9
+move 2 from 4 to 9
+move 4 from 8 to 6
+move 1 from 8 to 7
+move 4 from 8 to 5
+move 2 from 8 to 2
+move 17 from 9 to 5
+move 11 from 5 to 7
+move 1 from 2 to 5
+move 1 from 2 to 5
+move 1 from 9 to 1
+move 1 from 1 to 6
+move 5 from 7 to 6
+move 20 from 6 to 7
+move 4 from 6 to 4
+move 15 from 7 to 8
+move 2 from 3 to 7
+move 1 from 6 to 5
+move 10 from 8 to 4
+move 1 from 3 to 6
+move 4 from 6 to 4
+move 13 from 7 to 8
+move 1 from 7 to 5
+move 1 from 6 to 3
+move 1 from 6 to 3
+move 1 from 6 to 9
+move 9 from 4 to 1
+move 3 from 8 to 2
+move 14 from 5 to 6
+move 2 from 2 to 8
+move 1 from 3 to 9
+move 14 from 6 to 2
+move 1 from 3 to 9
+move 1 from 9 to 3
+move 15 from 2 to 1
+move 1 from 3 to 9
+move 4 from 4 to 9
+move 10 from 8 to 5
+move 1 from 9 to 5
+move 1 from 1 to 5
+move 4 from 8 to 7
+move 3 from 9 to 3
+move 1 from 8 to 5
+move 1 from 4 to 7
+move 2 from 8 to 7
+move 6 from 5 to 6
+move 4 from 1 to 2
+move 1 from 2 to 5
+move 2 from 2 to 8
+move 2 from 8 to 1
+move 3 from 7 to 2
+move 3 from 4 to 9
+move 18 from 1 to 8
+move 1 from 7 to 3
+move 3 from 9 to 6
+move 1 from 1 to 5
+move 5 from 6 to 4
+move 2 from 1 to 9
+move 8 from 4 to 5
+move 4 from 3 to 2
+move 16 from 5 to 4
+move 8 from 8 to 6
+move 2 from 2 to 6
+move 1 from 7 to 6
+move 7 from 8 to 1
+move 1 from 2 to 3
+move 2 from 8 to 3
+move 4 from 4 to 9
+move 4 from 1 to 2
+move 1 from 7 to 2
+move 1 from 5 to 4
+move 1 from 3 to 7
+move 3 from 4 to 5
+move 1 from 9 to 6
+move 9 from 2 to 5
+move 2 from 3 to 6
+move 3 from 5 to 8
+move 3 from 1 to 7
+move 4 from 5 to 8
+move 1 from 4 to 3
+move 5 from 9 to 5
+move 5 from 5 to 8
+move 1 from 3 to 4
+move 4 from 5 to 1
+move 2 from 5 to 4
+move 13 from 6 to 2
+move 12 from 2 to 9
+move 3 from 9 to 2
+move 4 from 1 to 6
+move 8 from 6 to 2
+move 1 from 4 to 9
+move 3 from 7 to 9
+move 2 from 9 to 8
+move 1 from 7 to 2
+move 9 from 9 to 5
+move 2 from 8 to 6
+move 4 from 2 to 3
+move 1 from 7 to 2
+move 1 from 6 to 4
+move 4 from 3 to 9
+move 9 from 5 to 8
+move 10 from 4 to 2
+move 1 from 4 to 7
+move 1 from 6 to 2
+move 1 from 6 to 7
+move 13 from 2 to 6
+move 1 from 2 to 5
+move 6 from 6 to 5
+move 7 from 5 to 8
+move 1 from 4 to 5
+move 27 from 8 to 5
+move 3 from 6 to 3
+move 2 from 8 to 6
+move 8 from 9 to 5
+move 1 from 7 to 9
+move 1 from 6 to 2
+move 4 from 5 to 9
+move 2 from 3 to 4
+move 9 from 2 to 5
+move 1 from 4 to 1
+move 1 from 4 to 2
+move 1 from 2 to 4
+move 1 from 3 to 7
+move 1 from 1 to 3
+move 1 from 3 to 9
+move 6 from 9 to 4
+move 1 from 7 to 5
+move 13 from 5 to 2
+move 1 from 9 to 5
+move 1 from 7 to 2
+move 5 from 2 to 7
+move 8 from 5 to 7
+move 6 from 4 to 2
+move 1 from 4 to 5
+move 3 from 2 to 4
+move 4 from 2 to 7
+move 2 from 4 to 3
+move 13 from 7 to 3
+move 5 from 2 to 3
+move 4 from 7 to 8
+move 11 from 3 to 8
+move 11 from 5 to 9
+move 4 from 6 to 9
+move 1 from 6 to 5
+move 1 from 4 to 2
+move 1 from 3 to 6
+move 3 from 2 to 6
+move 3 from 6 to 2
+move 1 from 6 to 1
+move 1 from 3 to 8
+move 3 from 3 to 6
+move 2 from 2 to 7
+move 4 from 3 to 9
+move 16 from 9 to 2
+move 1 from 7 to 8
+move 2 from 2 to 8
+move 9 from 2 to 3
+move 6 from 2 to 7
+move 1 from 6 to 3
+move 2 from 9 to 2
+move 1 from 9 to 7
+move 2 from 6 to 3
+move 4 from 3 to 9
+move 2 from 2 to 7
+move 1 from 2 to 5
+move 14 from 5 to 6
+move 14 from 6 to 3
+move 4 from 9 to 8
+move 5 from 8 to 4
+move 1 from 1 to 5
+move 4 from 8 to 1
+move 1 from 5 to 9
+move 8 from 7 to 2
+move 18 from 3 to 7
+move 1 from 1 to 5
+move 1 from 1 to 9
+move 1 from 4 to 5
+move 1 from 8 to 5
+move 8 from 2 to 9
+move 3 from 5 to 8
+move 7 from 7 to 1
+move 3 from 4 to 7
+move 1 from 3 to 6
+move 7 from 8 to 3
+move 2 from 9 to 3
+move 3 from 8 to 9
+move 9 from 1 to 7
+move 9 from 3 to 4
+move 2 from 3 to 4
+move 12 from 7 to 4
+move 1 from 3 to 8
+move 1 from 8 to 7
+move 8 from 4 to 7
+move 11 from 4 to 9
+move 5 from 4 to 8
+move 19 from 7 to 9
+move 1 from 6 to 2
+move 2 from 7 to 4
+move 2 from 8 to 3
+move 1 from 7 to 8
+move 1 from 3 to 2
+move 3 from 8 to 4
+move 1 from 8 to 9
+move 1 from 3 to 2
+move 36 from 9 to 1
+move 5 from 9 to 6
+move 5 from 4 to 2
+move 24 from 1 to 3
+move 5 from 6 to 7
+move 1 from 1 to 4
+move 14 from 3 to 4
+move 4 from 7 to 3
+move 1 from 8 to 5
+move 5 from 2 to 9
+move 1 from 1 to 6
+move 5 from 9 to 1
+move 3 from 2 to 3
+move 1 from 5 to 3
+move 11 from 4 to 2
+move 1 from 7 to 1
+move 6 from 1 to 9
+move 3 from 4 to 2
+move 1 from 6 to 7
+move 10 from 1 to 7
+move 3 from 2 to 1
+move 3 from 3 to 2
+move 2 from 1 to 7
+move 1 from 4 to 8
+move 13 from 3 to 2
+move 1 from 8 to 3
+move 2 from 7 to 5
+move 2 from 3 to 7
+move 2 from 5 to 2
+move 1 from 1 to 7
+move 28 from 2 to 6
+move 1 from 2 to 3
+move 2 from 8 to 2
+move 6 from 9 to 7
+move 1 from 3 to 8
+move 1 from 9 to 8
+move 3 from 6 to 2
+move 14 from 7 to 9
+move 3 from 2 to 1
+move 2 from 2 to 9
+move 2 from 1 to 9
+move 1 from 9 to 1
+move 7 from 6 to 9
+move 2 from 1 to 4
+move 2 from 4 to 6
+move 4 from 8 to 7
+move 1 from 7 to 6
+move 1 from 8 to 1
+move 1 from 3 to 6
+move 1 from 1 to 5
+move 14 from 9 to 8
+move 1 from 5 to 9
+move 5 from 7 to 3
+move 16 from 6 to 3
+move 2 from 7 to 4
+move 8 from 9 to 5
+move 6 from 6 to 1
+move 8 from 5 to 9
+move 2 from 7 to 4
+move 11 from 9 to 1
+move 4 from 4 to 1
+move 14 from 8 to 3
+move 2 from 1 to 7
+move 20 from 3 to 6
+move 5 from 3 to 1
+move 1 from 3 to 5
+move 2 from 7 to 4
+move 20 from 6 to 7
+move 18 from 7 to 6
+move 17 from 6 to 9
+move 1 from 5 to 3
+move 6 from 3 to 2
+move 3 from 3 to 1
+move 1 from 6 to 2
+move 2 from 7 to 8
+move 4 from 1 to 5
+move 2 from 4 to 9
+move 1 from 3 to 2
+move 1 from 8 to 6
+move 18 from 1 to 4
+move 1 from 2 to 7
+move 1 from 6 to 2
+move 3 from 4 to 3
+move 1 from 8 to 1
+move 4 from 1 to 6
+move 7 from 2 to 1
+move 1 from 5 to 7
+move 1 from 4 to 1
+move 2 from 6 to 3
+move 3 from 5 to 9
+move 9 from 9 to 8
+move 10 from 9 to 3
+move 9 from 3 to 5

day6/day6.jl

@@ -0,0 +1,57 @@
+#!/usr/bin/env julia
+
+using Test
+
+function string_start_index(s, width=4)
+  delta = width - 1
+  for i in 1:length(s)-delta
+    if length(Set(s[i:i+delta])) == width
+      println(i, " ", s[i:i+delta])
+      return i + delta
+    end
+  end
+end
+
+function file_start_index(infile, width=4)
+  io = open(infile, "r")
+  data = readchomp(io)
+  close(io)
+  return string_start_index(data, width)
+end
+
+function test()
+  @testset "elf signal start ex" verbose=true begin
+    @test string_start_index("mjqjpqmgbljsphdztnvjfqwrcgsmlb") == 7
+    @test string_start_index("bvwbjplbgvbhsrlpgdmjqwftvncz") == 5
+    @test string_start_index("nppdvjthqldpwncqszvftbrmjlhg") == 6
+    @test string_start_index("nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg") == 10
+    @test string_start_index("zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw") == 11
+    @test string_start_index("wewewewewewewewewewewewewebo") == 28
+  end
+  @testset "elf signal start in" verbose=true begin
+    @test file_start_index("input.txt") == 1142
+  end
+  @testset "elf signal msg ex" verbose=true begin
+    @test string_start_index("mjqjpqmgbljsphdztnvjfqwrcgsmlb", 14) == 19
+    @test string_start_index("bvwbjplbgvbhsrlpgdmjqwftvncz", 14) == 23
+    @test string_start_index("nppdvjthqldpwncqszvftbrmjlhg", 14) == 23
+    @test string_start_index("nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg", 14) == 29
+    @test string_start_index("zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw", 14) == 26
+  end
+  @testset "elf signal msg in" verbose=true begin
+    @test file_start_index("input.txt", 14) == 2803
+  end
+
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    println("start index: ", file_start_index(infile))
+  end
+end
+
+main()

day6/input.txt

@@ -0,0 +1 @@
+wzsspbssbhshchmmrmprmrfrsfrrjhjphjjtppbfflqfqppdhdbhdhbbjgghgzgsgfsfhfhvvwcwhwwnppsbsggqnnvvtffpssjfjnnltntdtdddptprppjmmqssrlrplllfrrzggbmmlmnmtnnzddfdgfdfsstbstbbzcbbcjcvvfwwwzlzssglsgllnbnmbnmbbgmmppmwwsrrzqqvgqgnqnmmswwrnnbsnnbdbwwqnwqnwwzzqwzqzjqqwbqbccjcwwjlwjwppqfqjffwddrzrjzrjzzzhchjjlqqrggzvvnlvnvjvhvnvjvbbvdvldldbbwddtsscbbhccmbmbppbmmgjggcjjlrrwjwtjwwmffgddwvdvbdbvvhchmhmdmwwbjbjcbbcmbmmslmlslsjjrnrjrjpjcjgcjcjbbwsbsbfssjzsjsggcmcsswgssbbqpbqqdsdqqztzmzpmpbmbvbjjtrjtthwhbhnbhnbnssvpvsppgrrcwrrmqqhpphrpphchvhphqhbqbtttllsrlsrshrrmhmvvrmrnngbgnbnpbprrrftfjtjwwmrmvmcmvmrmwmssrccfbbhppjbpbwbqwbqbzzfmzmtttjbbvcvppmwwrbbzsbzbfzfdzzhrhzhvvsqvsqsnslljwllqlwllvccnttzhtzzpspqspqsqgsssvnsvshvsvqvnvlldbbfdfmmpbpgphhpqhpppchhbfbrfrllntnznrrhdrdhhdhjjgwwqhhfssjbjwjqqbffvvcrchccwmcwcllljtjrrqgrrdcrddvfvwvzzjqqcffgjgzzdhdwdssffjjhccggmtmltlhtthzhvhlvlddsfsbbtjbjcbjcjzcjjpfjfzzpnnbtbqtbqtqptpnplllbzbllhbllnqnttpddqvdqvqmmjnjggnnnhqqfcqcffqppdgpddvqddmhmrhrtrmrzmzhzpzlzqlqpqhphrpppjqqppzbzmmjgggqtggtjthhlclnclcnccmcppdcpddqrrfgrgbbhwhdhrrqtqpqjpqjpqjqqmcqmccnngqqqmtqtssnvnzvvpcpwcwwqcqqqfcqffsvsmvmttttmrrzssghgssjmsmbmvvwggggzhhfvdpgjmmvzbfjghqhrfbpmbvjzwvfmcthrqwdhghpwsspmhpqnmwhjzpnlzfnvhdnnrqwnvctbmjqzhqrpjlwrssdlwqzmsfrfzmgjhnwwnwczswnhsdbvqbmdlvntsdrhrjjcjjhpbblgwhjwdcdjtpvtmslwvncwdjbwzvbpzbvddvssnrhtshrcvnhqnpmjzfswqbbrztnwjcpflfbhnphfwmjvnvtswgfttgjcqcngmmwjlfsprwfcfwcmgrgbnqmzbtzbtbztngvrzpsnrzvhbsdjnzpwwzllgnfdrlwpmnrznqsqcmvnfbnhqjddvcjmtgbpbmsgqdqzflmlmqncmhwltrmdmgnwpfwddrdpfhsgsnggchzjhgpwrsmdzgjtrgmnprhbwbcbpzbdvvstfqcnqzbdjqpmrdbtgcthtclftghhmnrzrjqqsbndhpvmdpfpwdlhvmczvdfgvpqclssvlhqnhlcfnfbvtspdzmgzdctvpdcwchtqhpsgmmblspjdlvgblbpgrfrgnqqsphcsrgfsdmpqscbjmnqrfbcwfthdtswbzthpnvsfbntnbmmgpfzlqwhppvvdrmwbqzbgppbgsqmjfqtmntgwpnccthftwdmvwmnchlbjhsnmbhndczbrhhjpbvnjdzrcndbbmfwfwsjwfgbqhwhrsvlngsbhhlrdjzzbmjpsqhlpzwcsntjhlmngblspmsjrjwsjsrqwnrcwsmcsbmpjwrthbqhrschrmrppnnbmjbvjzlmzsrfdwqlfnfjljftjvzsqdwlhbblqcdlqjbprpcllhlhmwrbrlgfrcqshrtjpnmhljttdvpfnhdjqvjhhfczwvbzqgnzgljcfrbpgwnfhfchwzqmqqzpbcdpqmnbrppzblnnzqrfnmgtljwnfgzwvnjppdbdhbznvpgwhbdjjvlspgwgjsmfsvllpgwlfnnptmwnfsshjjvqzjwrqpvmsphpmftqdllqqdzcjwfvpftgvspprdwvvcnglmbpntghntdwpjvvsppgjvnbjgvtzchtqtwbddncsbrfcvrnvlggvwgmmnfzrswnzjrwthzmdsmzqmzsnrqsnslnhmfqljnnnzshqfqshrhhjmnhdgphctswdbhnrcgnzmmzqpjqbtdfhhltsmvvtntbgsznshhsghblhlhqpmdcfhmnfzvhgnfsfflcfwbfqzmccrjdpfvphtqbrdnzjfmfhbzqcpdnjdcgwprvchlzrcvrghgjqncjvnndbcshntrfsbsnmjlhclnzpfdgztflcpwqpnvlscfndwqzfvcmpgfncszpmwcsrdbrrhdjvmthslfvmlgpqhlgwhqnjljcvhswbsbqfrfhvzwjvdmhzsgbmbmfnbpclqdwhvrlpppszptjvwtvdmfltfqqgjttdggcvllblnnhjqnjzhvpgpzzpzwbpjqbthnjjlmsjgjzqwnjlqrcdmmvsldtcrzqdrcmwqhnhfghdlmzwcspgmlpzhbdsmlwlqnhhvcvdfzmvfwpbfmjtdllprfqzzjpbrshdzgspsrlrwrhdpmznzzqngwrzqpmtwgbsswrnnnfctjhbcftnslsqwjvmfwfdvfqcnsvfsvgstgbzpmljjtlvtnfsdzpvcgbjqwgbgzqbjfgltqvnhffflsbjzfqfrfbssrvvwqvqptmhrbgllqjwptrzgvqgccsrvbgtvmzfzlmtqrgfwhzddsptclbhjlwqfntvjqdvcddnffmbtqrnsvtmlvljcqdsrpggcmqvmmlzwwbgznhblwzjdppvtqzjvcmtfzhdzjplrdbrfrgzpldvnsgqlbwbmfvrbgwzmjmmqdfgwtbgtzmdqnvqbwvcfjhddqvnjtjlhhjnltbtqqvblwlmglrqcrcfjvdntrnqzzbmrjqglmrdcjgnshcghtprjqqsdrmgdnzmzcfqqdtjtrqgtqtgrpmmgzjtcrznmqccjbdpbvrnnbmbzvgdcnrczbctbrsrrqrjnfcdpzlnngwvcdtbbgssvhpptntqdzhcqtlpvzjbfgzggrgrcgtdfjbwdcrpztnfcdbscnlmqmwcbmtnddgbmhwsgvcfdcmhlsvtnqtmrnsjzhppgwvzlmhwwmpfjzrfbhsgntzrdhwswrnfmmmczqrvdrqnhgrvqbdddhglwsftsljvgbnjqfwfzsspdqvgsnlgfsfpvdrjhzcldtrmjjrmdhvvfrjldhhtqnvsvlldjpjbpwstfsmrpmbqbnnpvqtbgjvblthbmwqtfcfgnjscvtbvlqcmlhffpzgjzfscsqwnhrjhvbrrzwqvbjwtwhtqsdbssfgncppnsfgfltdcbjqjzqqtprsbvjzhmchnltvmbsvpvhgzhfhbrnttsqbcmwpdnwqqgdrjrdwdhtzwsmcdffqgsddvbzfjhtfhtnfdbfrwmdtcqshfjrcpswzcptgwgmctpmzjdbqlmqwthmnfplmctpsslcsdtqpqhjtmjdnmnqnjgchwstsmtpvsmgpsbfgwqnzhrdgdvcdlcldfcmjvsdldgbmhltjhczffwmzqssnhfnwftfgpshntjbpjdffjpcmcpwhclrrwqcqzmntjglzgcfrplfpvprtpvpjdlcrfwrtrzdzmhsrsmdcpqqrqgvfpdbmzbzqdfhpplmgfrdghclbclgswvwhhdvcpmpzflpffmptcrwglftztccrpbrvmpnqmqdgjgrrlbtqtvgcjpljttwtdslqjqlsdpblgrqbrtbmtblfbqtbvsqhpqzpqfhjqpmjrmcvqmsbbpjpdncgnjftclbltwszrrfzqbjcdtphcvpmbhppvwjwlprgmghrjzzgnvzlvghnjbzqjpdgzfsnjchpbzqdzpsjmsrvvqwjcpwznlpbjldlrdfqtrzhqzcnpjqbbbf

day7/day7.jl

@@ -0,0 +1,105 @@
+#!/usr/bin/env julia
+
+using Test
+
+mutable struct Dir
+  path :: String
+  dnames :: Vector{String}
+  fsize :: Int32
+end
+
+function get_dir_map(infile)
+  cwd = Vector{String}()
+  path = "/"
+  dirmap = Dict{String, Dir}()
+  open(infile, "r") do io
+    for line in eachline(io)
+      parts = split(line)
+      if parts[1] == "\$"
+        if parts[2] == "cd"
+          if parts[3] == "/"
+            empty!(cwd)
+          elseif parts[3] == ".."
+            pop!(cwd)
+          else
+            push!(cwd, parts[3])
+          end
+          path = "/" * join(cwd, '/')
+          if ! haskey(dirmap, path)
+            dirmap[path] = Dir(path, [], 0)
+          end
+        elseif parts[2] != "ls"
+          println("Unknown command: ", line)
+        end
+      else
+        parts = split(line, limit=2)
+        if parts[1] == "dir"
+          push!(dirmap[path].dnames, joinpath(path, parts[2]))
+        else
+          dirmap[path].fsize += parse(Int, parts[1])
+        end
+      end
+    end
+  end
+  for k in sort(collect(keys(dirmap)), by=p->length(p), rev=true)
+    v = dirmap[k]
+    for p in v.dnames
+      dirmap[k].fsize += dirmap[p].fsize
+    end
+  end
+  return dirmap
+end
+  
+
+function small_dir_sum(infile)
+  dirmap = get_dir_map(infile)
+  small_sum = 0
+  for v in values(dirmap)
+    if v.fsize <= 100000
+      small_sum += v.fsize
+    end
+  end
+  return small_sum
+end
+
+function delete_candidate_size(infile)
+  dirmap = get_dir_map(infile)
+  total = 70000000
+  want = 30000000
+  used = dirmap["/"].fsize
+  free = total - used
+  need = want - free
+  candidates = Vector{Int64}()
+  # println("used ", used)
+  # println("free ", free)
+  # println("need ", need)
+  for v in values(dirmap)
+    if v.fsize >= need
+      push!(candidates, v.fsize)
+    end
+  end
+  return minimum(candidates)
+end
+
+function test()
+  @testset "disk usage small dir sum" verbose=true begin
+    @test small_dir_sum("example.txt") == 95437
+    @test small_dir_sum("input.txt") == 1306611
+  end
+  @testset "disk usage delete candidate size" verbose=true begin
+    @test delete_candidate_size("example.txt") == 24933642
+    @test delete_candidate_size("input.txt") == 13210366
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    println("error priority sum: ", rucksack_errors(infile))
+  end
+end
+
+main()

day7/example.txt

@@ -0,0 +1,23 @@
+$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k

day8/day8.jl

@@ -0,0 +1,105 @@
+#!/usr/bin/env julia
+
+using Test
+
+function is_visible(tree_map, i, j)
+  v = tree_map[i, j]
+  less_v(x) = x < v
+  if all(less_v, tree_map[i, 1:j-1])
+    return true
+  end
+  if all(less_v, tree_map[i, j+1:end])
+    return true
+  end
+  if all(less_v, tree_map[1:i-1, j])
+    return true
+  end
+  if all(less_v, tree_map[i+1:end, j])
+    return true
+  end
+  return false
+end
+
+function visible_trees_at(tree_map, i, j)
+  nrows, ncols = size(tree_map)
+  v = tree_map[i, j]
+  ge_v(x) = x >= v
+  up_idx = findfirst(ge_v, tree_map[i-1:-1:1, j])
+  up_score = up_idx === nothing ? i - 1 : up_idx
+  down_idx = findfirst(ge_v, tree_map[i+1:end, j])
+  down_score = down_idx === nothing ? nrows - i : down_idx
+  left_idx = findfirst(ge_v, tree_map[i, j-1:-1:1])
+  left_score = left_idx === nothing ? j - 1 : left_idx
+  right_idx = findfirst(ge_v, tree_map[i, j+1:end])
+  right_score = right_idx === nothing ? ncols - j : right_idx
+  return (up_score, down_score,left_score, right_score)
+end
+
+function scenic_score(tree_map, i, j)
+  return prod(visible_trees_at(tree_map, i, j))
+end
+
+function read_uint_matrix(io)
+  lines = readlines(io)
+  matrix = Matrix{UInt8}(undef, length(lines), length(lines[1]))
+  for (i, line) in enumerate(lines)
+    matrix[i, :] = parse.(UInt8, collect(line))
+  end
+  return matrix
+end
+
+function count_visible(tree_map)
+  nrows, ncols = size(tree_map)
+  nvisible = 2 * (nrows + ncols) - 4
+  nvisible += sum([is_visible(tree_map, i, j) ? 1 : 0
+                   for j in 2:nrows-1
+                   for i in 2:ncols-1])
+  return nvisible
+end
+
+function max_scenic_score(tree_map)
+  nrows, ncols = size(tree_map)
+  return maximum([scenic_score(tree_map, i, j)
+                  for j in 2:nrows-1
+                  for i in 2:ncols-1])
+end
+
+function visiblility_map(tree_map)
+  nrows, ncols = size(tree_map)
+  vmap = Matrix{NTuple{4, Int}}(undef, nrows-2, ncols-2)
+  for j in 2:nrows-1
+    for i in 2:ncols-1
+      vmap[i-1, j-1] = visible_trees_at(tree_map, i, j)
+    end
+  end
+  return vmap
+end
+
+function test()
+  @testset "visible trees" verbose=true begin
+    @test count_visible(read_uint_matrix("example.txt")) == 21
+    @test count_visible(read_uint_matrix("input.txt")) == 1845
+  end
+  @testset "max score" verbose=true begin
+    @test max_scenic_score(read_uint_matrix("example.txt")) == 8
+    @test max_scenic_score(read_uint_matrix("input.txt")) == 230112
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    tree_map = read_uint_matrix(infile)
+    println("matrix: ", tree_map)
+    println("visible: ", count_visible(tree_map))
+    println("max score: ", max_scenic_score(tree_map))
+    println("visible at: ")
+    display(visiblility_map(tree_map))
+    println()
+  end
+end
+
+main()

day8/example.txt

@@ -0,0 +1,5 @@
+30373
+25512
+65332
+33549
+35390

day8/input.txt

@@ -0,0 +1,99 @@
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day9/day9.jl

@@ -0,0 +1,148 @@
+#!/usr/bin/env julia
+
+using Test
+using Images
+
+struct Move
+  direction :: Char
+  count :: Int
+end
+
+mutable struct Point{T}
+  x::T
+  y::T
+end
+
+function parse_move(line)
+  parts = split(line, limit=2)
+  return Move(parts[1][1], parse(Int, parts[2]))
+end
+
+function read_moves(io)
+  return [parse_move(line) for line in readlines(io)]
+end
+
+function apply_move(head, tail, direction)
+  if direction == 'U'
+    head.y += 1
+  elseif direction == 'D'
+    head.y -= 1
+  elseif direction == 'L'
+    head.x -= 1
+  elseif direction == 'R'
+    head.x += 1
+  elseif direction != 'O'
+    throw(DomainError("Unknown direction"))
+  end
+  x_diff = head.x - tail.x
+  y_diff = head.y - tail.y
+  if abs(x_diff) <= 1 && abs(y_diff) <= 1
+    return head, tail
+  end
+  if abs(x_diff) <= 1
+    tail.x += x_diff
+    tail.y += sign(y_diff) * (abs(y_diff) - 1)
+  elseif abs(y_diff) <= 1
+    tail.y += y_diff
+    tail.x += sign(x_diff) * (abs(x_diff) - 1)
+  elseif abs(x_diff) == 2 && abs(y_diff) == 2
+    # possible with more than 2 knots
+    tail.x += sign(x_diff) * (abs(x_diff) - 1)
+    tail.y += sign(y_diff) * (abs(y_diff) - 1)
+  else
+    throw(DomainError("invalid knots " * string(head) * " " * string(tail)))
+  end 
+  return head, tail
+end
+
+function get_visited(moves; nknots::Int=2)
+  visited = Set{NTuple{2, Int}}()
+  knots = [Point(0, 0) for _ in 1:nknots]
+  push!(visited, (knots[nknots].x, knots[nknots].y))
+  for move in moves
+    for _ in 1:move.count
+      knots[1], knots[2] = apply_move(knots[1], knots[2], move.direction)
+      for i in 2:nknots
+        _, knots[i] = apply_move(knots[i-1], knots[i], 'O')
+      end
+      push!(visited, (knots[nknots].x, knots[nknots].y))
+    end
+  end
+  return visited
+end
+
+function int_map(visited)
+  (min_x, max_x) = extrema([t[1] for t in visited])
+  (min_y, max_y) = extrema([t[2] for t in visited])
+  nrows = max_y - min_y + 1
+  ncols = max_x - min_x + 1
+  imap = zeros(Int, nrows, ncols)
+  for (x, y) in visited
+    imap[nrows - (y - min_y), (x - min_x + 1)] = 1
+  end
+  imap[nrows + min_y, 1 - min_x] = -1
+  return imap
+end
+
+function ascii_map(visited)
+  map_char(n) = (n == -1 ? 's'
+                 : (n == 1 ? "#"[1] : '.'))
+  srows = mapreduce(map_char, *, int_map(visited), dims=2; init="")
+  return join(srows, "\n")
+end
+
+function scale_pixels(img, scale::Int)
+  (nrows, ncols) = size(img)
+  new_img = Matrix{RGB}(undef, nrows * scale, ncols * scale)
+  for i in 1:nrows
+    for j in 1:ncols
+      i2 = (i - 1) * scale + 1
+      j2 = (j - 1) * scale + 1
+      new_img[i2:i2+scale-1, j2:j2+scale-1] .= img[i, j]
+    end
+  end
+  return new_img
+end
+
+function image_map(visited; scale::Int=10)
+  imap = int_map(visited)
+  map_color(n) = (n == -1 ? RGB(0, 0.8, 0)
+                  : (n == 1 ? RGB(0.2, 0.2, 0.0) : RGB(0, 0, 0)))
+  cmap = map(map_color, int_map(visited))
+  return scale_pixels(cmap, scale)
+end
+
+function test()
+  @testset "visited count 2 knot" verbose=true begin
+    @test length(get_visited(read_moves("example.txt"))) == 13
+    @test length(get_visited(read_moves("input.txt"))) == 6037
+  end
+  @testset "visited count 10 knot" verbose=true begin
+    @test length(get_visited(read_moves("example.txt"), nknots=10)) == 1
+    @test length(get_visited(read_moves("input.txt"), nknots=10)) == 2485
+  end
+end
+
+function main()
+  if size(ARGS, 1) == 0
+    test()
+  else
+    infile = ARGS[1]
+    println("infile = ", infile)
+    moves = read_moves(infile)
+    println("moves: ", moves)
+    visited = get_visited(moves)
+    println("visited: ", visited)
+    println("count  : ", length(visited))
+    println(ascii_map(visited))
+    save("visited.png", image_map(visited))
+
+    visited10 = get_visited(moves, nknots=10)
+    println("visited10: ", visited10)
+    println("count10  : ", length(visited10))
+    println(ascii_map(visited10))
+    save("visited10.png", image_map(visited10))
+  end
+end
+
+main()

day9/example.txt

@@ -0,0 +1,8 @@
+R 4
+U 4
+L 3
+D 1
+R 4
+D 1
+L 5
+R 2

day9/example2.txt

@@ -0,0 +1,8 @@
+R 5
+U 8
+L 8
+D 3
+R 17
+D 10
+L 25
+U 20