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2021/day1.txt

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2021/day2.txt

reviewed

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+246

2021/solutions.livemd

reviewed

··· 1 1 + <!-- vim: syntax=markdown --> 2 2 + <!-- livebook:{"persist_outputs":true} --> 3 3 + 4 4 + # Advent of Code 2021 5 5 + 6 6 + ## Setup 7 7 + 8 8 + ```elixir 9 9 + Mix.install([]) 10 10 + ``` 11 11 + 12 12 + ```output 13 13 + :ok 14 14 + ``` 15 15 + 16 16 + ## Day 1 17 17 + 18 18 + ### Load input 19 19 + 20 20 + ```elixir 21 21 + stream = 22 22 + File.stream!("day1.txt") 23 23 + |> Stream.map(&String.to_integer(String.trim(&1))) 24 24 + ``` 25 25 + 26 26 + ```output 27 27 + #Stream<[ 28 28 + enum: %File.Stream{ 29 29 + line_or_bytes: :line, 30 30 + modes: [:raw, :read_ahead, :binary], 31 31 + path: "day1.txt", 32 32 + raw: true 33 33 + }, 34 34 + funs: [#Function<47.58486609/1 in Stream.map/2>] 35 35 + ]> 36 36 + ``` 37 37 + 38 38 + ### Task 1 39 39 + 40 40 + <!-- livebook:{"break_markdown":true} --> 41 41 + 42 42 + Compute count of consecutive increases 43 43 + 44 44 + ```elixir 45 45 + stream 46 46 + |> Stream.chunk_every(2, 1, :discard) 47 47 + |> Enum.count(fn [a, b] -> a < b end) 48 48 + ``` 49 49 + 50 50 + ```output 51 51 + 1688 52 52 + ``` 53 53 + 54 54 + ### Task 2 55 55 + 56 56 + <!-- livebook:{"break_markdown":true} --> 57 57 + 58 58 + Compute count of consecutive increases of sums of trigrams. 59 59 + 60 60 + However we can notice, that if we have list like: 61 61 + 62 62 + $$ 63 63 + [a, b, c, d] 64 64 + $$ 65 65 + 66 66 + Then when we want to compare consecutive trigrams then we compare: 67 67 + 68 68 + $$ 69 69 + a + b + c < b + c + d \\ 70 70 + a < d 71 71 + $$ 72 72 + 73 73 + So we can traverse each 4 elements and then just compare first and last one 74 74 + instead of summing and then traversing it again. 75 75 + 76 76 + ```elixir 77 77 + stream 78 78 + |> Stream.chunk_every(4, 1, :discard) 79 79 + |> Enum.count(fn [a, _, _, b] -> a < b end) 80 80 + ``` 81 81 + 82 82 + ```output 83 83 + 1728 84 84 + ``` 85 85 + 86 86 + ## Day 2 87 87 + 88 88 + ### Load input 89 89 + 90 90 + We do parsing there, as it will help us with the latter tasks. Pattern matching 91 91 + is the simplest approach there, as input is in form of: 92 92 + 93 93 + ``` 94 94 + forward 10 95 95 + up 20 96 96 + down 30 97 97 + ``` 98 98 + 99 99 + We need to `trim/1` input to make sure that the last newline will not interrupt 100 100 + `String.to_integer/1` calls. 101 101 + 102 102 + ```elixir 103 103 + stream = 104 104 + File.stream!("day2.txt") 105 105 + |> Stream.map(fn input -> 106 106 + case String.trim(input) do 107 107 + "forward " <> n -> {:forward, String.to_integer(n)} 108 108 + "up " <> n -> {:up, String.to_integer(n)} 109 109 + "down " <> n -> {:down, String.to_integer(n)} 110 110 + end 111 111 + end) 112 112 + ``` 113 113 + 114 114 + ```output 115 115 + #Stream<[ 116 116 + enum: %File.Stream{ 117 117 + line_or_bytes: :line, 118 118 + modes: [:raw, :read_ahead, :binary], 119 119 + path: "day2.txt", 120 120 + raw: true 121 121 + }, 122 122 + funs: [#Function<47.58486609/1 in Stream.map/2>] 123 123 + ]> 124 124 + ``` 125 125 + 126 126 + ### Task 1 127 127 + 128 128 + ```elixir 129 129 + {h, d} = 130 130 + stream 131 131 + |> Enum.reduce({0, 0}, fn 132 132 + {:forward, n}, {h, d} -> {h + n, d} 133 133 + {:up, n}, {h, d} -> {h, d - n} 134 134 + {:down, n}, {h, d} -> {h, d + n} 135 135 + end) 136 136 + 137 137 + h * d 138 138 + ``` 139 139 + 140 140 + ```output 141 141 + 1499229 142 142 + ``` 143 143 + 144 144 + ### Task 2 145 145 + 146 146 + ```elixir 147 147 + {h, d, _} = 148 148 + stream 149 149 + |> Enum.reduce({0, 0, 0}, fn 150 150 + {:forward, n}, {h, d, a} -> {h + n, d + a * n, a} 151 151 + {:up, n}, {h, d, a} -> {h, d, a - n} 152 152 + {:down, n}, {h, d, a} -> {h, d, a + n} 153 153 + end) 154 154 + 155 155 + h * d 156 156 + ``` 157 157 + 158 158 + ```output 159 159 + 1340836560 160 160 + ``` 161 161 + 162 162 + ## Day 3 163 163 + 164 164 + ### Input 165 165 + 166 166 + ```elixir 167 167 + stream = 168 168 + File.stream!("day3.txt") 169 169 + |> Enum.map(&String.trim/1) 170 170 + |> Enum.map(&String.to_charlist/1) 171 171 + 172 172 + defmodule Day3 do 173 173 + def count(list) do 174 174 + Enum.reduce(list, List.duplicate(0, 12), fn input, acc -> 175 175 + for {value, counter} <- Enum.zip(input, acc) do 176 176 + case value do 177 177 + ?1 -> counter + 1 178 178 + ?0 -> counter 179 179 + end 180 180 + end 181 181 + end) 182 182 + end 183 183 + end 184 184 + ``` 185 185 + 186 186 + ```output 187 187 + {:module, Day3, <<70, 79, 82, 49, 0, 0, 7, ...>>, {:count, 1}} 188 188 + ``` 189 189 + 190 190 + ### Task 1 191 191 + 192 192 + ```elixir 193 193 + half = div(length(stream), 2) 194 194 + 195 195 + {a, b} = 196 196 + stream 197 197 + |> Day3.count() 198 198 + |> Enum.reduce({0, 0}, fn elem, {a, b} -> 199 199 + if elem > half do 200 200 + {a * 2 + 1, b * 2} 201 201 + else 202 202 + {a * 2, b * 2 + 1} 203 203 + end 204 204 + end) 205 205 + 206 206 + a * b 207 207 + ``` 208 208 + 209 209 + ```output 210 210 + 3847100 211 211 + ``` 212 212 + 213 213 + ### Task 2 214 214 + 215 215 + ```elixir 216 216 + defmodule Day3.Task2 do 217 217 + def reduce(list, cb), do: reduce(list, 0, cb) 218 218 + 219 219 + defp reduce([elem], _, _), do: elem 220 220 + 221 221 + defp reduce(list, at, cb) do 222 222 + counts = Day3.count(list) 223 223 + 224 224 + half = div(length(list), 2) 225 225 + count = Enum.at(counts, at) 226 226 + 227 227 + bit = 228 228 + cond do 229 229 + count == half and cb.(count + 1, half) -> ?1 230 230 + count != half and cb.(count, half) -> ?1 231 231 + true -> ?0 232 232 + end 233 233 + 234 234 + reduce(Enum.filter(list, &(Enum.at(&1, at) == bit)), at + 1, cb) 235 235 + end 236 236 + end 237 237 + 238 238 + co2 = List.to_integer(Day3.Task2.reduce(stream, &</2), 2) 239 239 + o2 = List.to_integer(Day3.Task2.reduce(stream, &>/2), 2) 240 240 + 241 241 + co2 * o2 242 242 + ``` 243 243 + 244 244 + ```output 245 245 + 4105235 246 246 + ```