diff --git a/README.md b/README.md
index fbe27f5..e900774 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
My (attempted) solutions to [Advent of Code 2020](https://adventofcode.com/2020) in Elixir.
-
+
## Strategy
diff --git a/day16/README b/day16/README
new file mode 100644
index 0000000..9f18249
--- /dev/null
+++ b/day16/README
@@ -0,0 +1,56 @@
+Day 16 Notes
+
++--------+
+| Part 1 |
++--------+
+
+$ elixir day16part1.exs
+28884
+
+Thoughts:
+
+
++--------+
+| Part 2 |
++--------+
+
+$ elixir day16part2.exs
+Idenfitied columns: %{
+ "arrival location" => 18,
+ "arrival platform" => 12,
+ "arrival station" => 10,
+ "arrival track" => 7,
+ "class" => 15,
+ "departure date" => 11,
+ "departure location" => 2,
+ "departure platform" => 13,
+ "departure station" => 14,
+ "departure time" => 1,
+ "departure track" => 9,
+ "duration" => 0,
+ "price" => 5,
+ "route" => 16,
+ "row" => 19,
+ "seat" => 17,
+ "train" => 4,
+ "type" => 3,
+ "wagon" => 6,
+ "zone" => 8
+}
+Answer: 1001849322119
+
+Thoughts:
+
+
++------------------+
+| Overall Thoughts |
++------------------+
+
+Initial version. Will tidy up later.
+
+Spent a bit too long on silly mistakes in this one. Think I need to consider my development
+process to help avoid making errors.
+
+Also, I'm finding these daily puzzles a bit too distracting from work. I think after today
+I'm going to relegate them to the weekend. Doing them in the evenings has too much potential
+to spill over into the next day.
diff --git a/day16/day16part1.exs b/day16/day16part1.exs
new file mode 100644
index 0000000..5b2104e
--- /dev/null
+++ b/day16/day16part1.exs
@@ -0,0 +1,42 @@
+defmodule Day16Part1 do
+ def run do
+ {rules, _my_ticket, tickets} =
+ File.read!("input")
+ |> parse_input()
+
+ Enum.flat_map(tickets, &invalid_fields(&1, rules))
+ |> Enum.sum()
+ |> IO.puts()
+ end
+
+ def parse_input(input) do
+ [rules, [_, my_ticket | _], [_ | nearby_tickets]] =
+ input
+ |> String.split("\n\n", trim: true)
+ |> Enum.map(&String.split(&1, "\n", trim: true))
+
+ rules = Enum.map(rules, &parse_rule/1)
+
+ [my_ticket | nearby_tickets] =
+ [my_ticket | nearby_tickets]
+ |> Enum.map(fn ticket -> String.split(ticket, ",") |> Enum.map(&String.to_integer/1) end)
+
+ {rules, my_ticket, nearby_tickets}
+ end
+
+ def parse_rule(rule) do
+ [name | ranges] =
+ Regex.run(~r/\A(.*): (\d+)-(\d+) or (\d+)-(\d+)\z/, rule, capture: :all_but_first)
+
+ [a, b, c, d] = Enum.map(ranges, &String.to_integer/1)
+ {name, a..b, c..d}
+ end
+
+ def invalid_fields(ticket, rules) do
+ Enum.reject(ticket, fn field ->
+ Enum.any?(rules, fn {_name, range1, range2} -> field in range1 || field in range2 end)
+ end)
+ end
+end
+
+Day16Part1.run()
diff --git a/day16/day16part2.exs b/day16/day16part2.exs
new file mode 100644
index 0000000..eb354bb
--- /dev/null
+++ b/day16/day16part2.exs
@@ -0,0 +1,95 @@
+defmodule Day16Part2 do
+ def run do
+ {rules, my_ticket, tickets} =
+ File.read!("input")
+ |> parse_input()
+
+ tickets
+ |> Enum.filter(&valid?(&1, rules))
+ |> transpose_tickets()
+ |> identify_columns(rules)
+ |> IO.inspect(label: "Idenfitied columns", charlists: :as_lists)
+ |> Enum.filter(&match?({"departure" <> _, _idx}, &1))
+ |> Enum.reduce(1, fn {_name, idx}, acc -> my_ticket[idx] * acc end)
+ |> IO.inspect(label: "Answer")
+ end
+
+ def parse_input(input) do
+ [rules, [_, my_ticket | _], [_ | nearby_tickets]] =
+ input
+ |> String.split("\n\n", trim: true)
+ |> Enum.map(&String.split(&1, "\n", trim: true))
+
+ rules = Map.new(rules, &parse_rule/1)
+
+ [my_ticket | nearby_tickets] =
+ [my_ticket | nearby_tickets]
+ |> Enum.map(fn ticket -> String.split(ticket, ",") |> Enum.map(&String.to_integer/1) end)
+
+ my_ticket = my_ticket |> Enum.with_index() |> Map.new(fn {val, idx} -> {idx, val} end)
+
+ {rules, my_ticket, nearby_tickets}
+ end
+
+ def parse_rule(rule) do
+ [name | ranges] =
+ Regex.run(~r/\A(.*): (\d+)-(\d+) or (\d+)-(\d+)\z/, rule, capture: :all_but_first)
+
+ [a, b, c, d] = Enum.map(ranges, &String.to_integer/1)
+ {name, {a..b, c..d}}
+ end
+
+ def valid?(ticket, rules) do
+ Enum.all?(ticket, fn field ->
+ Enum.any?(rules, fn {_name, {range1, range2}} -> field in range1 || field in range2 end)
+ end)
+ end
+
+ def transpose_tickets(tickets), do: transpose_tickets(tickets, [], 0, length(hd(tickets)))
+ def transpose_tickets(_tickets, columns, stop, stop), do: columns
+
+ def transpose_tickets(tickets, columns, field_index, stop) do
+ {remaining_columns, column} = next_column(tickets)
+
+ transpose_tickets(remaining_columns, [{field_index, column} | columns], field_index + 1, stop)
+ end
+
+ def next_column(tickets) do
+ Enum.map_reduce(tickets, [], fn [field | rest], column -> {rest, [field | column]} end)
+ end
+
+ def identify_column(column, rules) do
+ Enum.filter(rules, fn {_field, {range1, range2}} ->
+ Enum.all?(column, fn val -> val in range1 || val in range2 end)
+ end)
+ |> Enum.map(&elem(&1, 0))
+ end
+
+ # Probably overcomplicated this.
+ # First find which columns satisfy which rules.
+ # The number of valid fields for each column is unique, which doesn't seem like a coincidence.
+ # Then allocate the columns to fields starting from the column with the smallest number
+ # of valid columns - need to filter out the known values for the rest of the columns.
+ # It's the final filtering part that makes me think I'm missing a trick.
+ def identify_columns(transposed_tickets, rules) do
+ {field_map, by_valid_count} =
+ Enum.reduce(transposed_tickets, {%{}, %{}}, fn {id, column}, {field_map, by_valid_count} ->
+ names = identify_column(column, rules)
+ valid_count = length(names)
+
+ {Map.put(field_map, id, names), Map.put(by_valid_count, valid_count, id)}
+ end)
+
+ {identified, _seen} =
+ by_valid_count
+ |> Enum.sort(fn {k1, _}, {k2, _} -> k1 <= k2 end)
+ |> Enum.reduce({%{}, MapSet.new()}, fn {_, col}, {identified, seen} ->
+ field = field_map[col] |> MapSet.new() |> MapSet.difference(seen) |> Enum.at(0)
+ {Map.put(identified, field, col), MapSet.put(seen, field)}
+ end)
+
+ identified
+ end
+end
+
+Day16Part2.run()
diff --git a/day16/input b/day16/input
new file mode 100644
index 0000000..c6c4382
--- /dev/null
+++ b/day16/input
@@ -0,0 +1,266 @@
+departure location: 49-258 or 268-960
+departure station: 37-117 or 128-968
+departure platform: 31-70 or 78-974
+departure track: 26-234 or 247-952
+departure date: 49-625 or 635-969
+departure time: 26-777 or 799-974
+arrival location: 49-735 or 757-971
+arrival station: 28-381 or 399-970
+arrival platform: 49-77 or 95-957
+arrival track: 29-467 or 477-950
+class: 40-218 or 234-967
+duration: 45-900 or 911-970
+price: 42-442 or 452-966
+route: 45-104 or 112-953
+row: 49-877 or 884-957
+seat: 40-168 or 184-953
+train: 43-913 or 920-949
+type: 43-292 or 315-955
+wagon: 48-547 or 558-954
+zone: 40-929 or 935-954
+
+your ticket:
+59,101,191,149,167,197,199,137,163,131,113,67,103,97,61,139,157,151,193,53
+
+nearby tickets:
+765,721,63,432,949,277,838,143,894,681,976,948,949,605,810,368,595,729,593,373
+205,877,327,644,328,652,102,892,156,525,884,355,195,187,106,886,405,608,163,286
+602,284,250,271,156,561,113,376,892,554,800,328,924,526,321,434,368,837,59,491
+923,604,129,647,801,838,620,152,50,673,804,54,371,354,687,877,983,334,723,566
+569,870,114,688,613,521,368,501,857,480,406,927,402,125,429,357,217,651,463,821
+513,147,329,113,856,734,867,495,381,728,400,661,843,583,857,820,925,323,532,931
+70,274,713,453,195,776,379,337,221,899,139,286,866,139,888,562,776,777,651,460
+857,861,499,561,335,690,333,890,935,807,333,64,843,531,405,424,945,668,445,279
+758,590,983,582,770,543,250,601,766,151,55,420,651,498,327,861,857,319,530,372
+872,286,949,708,466,279,613,719,485,404,590,273,283,842,644,599,340,873,203,266
+773,152,616,449,415,414,875,617,114,281,66,644,602,639,694,671,203,638,97,840
+945,731,834,455,304,199,808,524,829,421,437,648,339,408,65,341,258,836,714,285
+65,94,429,586,835,408,565,186,682,674,947,329,332,365,279,573,695,198,458,887
+812,525,554,765,807,642,574,661,842,713,559,100,329,715,640,198,766,801,681,820
+164,358,106,428,286,518,334,440,845,139,134,402,289,570,813,234,341,114,945,189
+135,332,99,857,814,280,216,114,414,441,501,137,66,677,172,833,402,254,617,52
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+150,699,279,604,665,866,698,424,535,827,401,111,767,207,923,414,581,568,201,868
+462,67,479,164,763,690,759,491,638,620,605,687,201,537,80,913,833,559,209,509
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+67,434,99,64,319,704,758,369,536,705,141,271,95,842,722,285,317,848,999,892
+734,675,990,825,890,767,619,215,272,576,425,581,115,663,101,867,362,516,949,647
+132,927,617,518,701,509,325,718,822,713,329,332,163,278,348,532,280,616,527,468
+112,162,489,542,575,189,855,607,335,328,870,493,610,575,715,22,570,854,375,545
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+411,826,247,175,340,199,622,824,714,133,405,684,874,202,198,706,644,330,600,592
+150,673,162,812,676,412,202,829,253,696,497,901,417,356,328,700,726,328,534,560
+606,190,596,800,149,351,939,645,581,663,477,60,102,681,269,595,615,551,564,257
+926,295,481,57,602,896,895,376,717,819,502,487,564,361,432,216,252,194,585,486
+213,441,668,859,531,532,568,511,458,318,590,515,290,347,840,509,926,388,375,872
+693,269,287,204,190,104,317,63,676,711,53,767,728,245,530,500,69,138,769,316
+502,508,926,490,331,184,808,196,439,684,855,594,145,54,464,450,57,844,546,285
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