···
1
+
<!-- livebook:{"persist_outputs":true} -->
6
+
Mix.install([:kino_aoc])
11
+
<!-- livebook:{"attrs":"eyJhc3NpZ25fdG8iOiJwdXp6bGVfaW5wdXQiLCJkYXkiOiI4Iiwic2Vzc2lvbl9zZWNyZXQiOiJBRFZFTlRfT0ZfQ09ERV9TRVNTSU9OIiwieWVhciI6IjIwMjQifQ","chunks":null,"kind":"Elixir.KinoAOC.HelperCell","livebook_object":"smart_cell"} -->
14
+
{:ok, puzzle_input} =
15
+
KinoAOC.download_puzzle("2024", "8", System.fetch_env!("LB_ADVENT_OF_CODE_SESSION"))
18
+
<!-- livebook:{"output":true} -->
22
+
"..........M..........j.............y.....O........\n...B...............q......m........lGO............\n....................q......2.l.GQ...O.............\n.....X.......................................4....\n.....................q............................\n....M......P...............xl.K.............2.....\n....F.........L.......C.K..............m..........\n..........FM......P....jy......m..........o...r...\n..X.......P.....RL..............G..x..........4...\n............L..........NC.....q...................\n.....C.X...............K....y..........4..........\n........S...R.............j.x.....V...4...........\n.....................R..x.....V..i......m.........\n...........................R.V......N.......X.....\n.....F.........M......N......E....................\n................v................T.......F......O.\n.............................N...V.......Q........\n...v.....................C.....i..................\n......c.....W..n.w........................E.......\n3...................c.....................Q..6....\n...........h......................j...............\n.......n.0......h.................E..............2\n.v.............7.......120.....c..................\n......n.0............w...........D.t.........E...r\n....8..3......0.w.hP....z...D..T...............r..\n.................f........T........G......eQ......\n......f.n.....7..p................................\n.....Y..7.......f......I......D......K............\n............Uf....T..W.....D..r...i...............\n......I...............................Z...........\n....5....B.......b..............s..............Z..\n..........d...W..Uwh.............c..........i.....\n..I.3..Y......................e...................\n.....p.b..........k......7........................\np...........k....I..b..........s..................\n.....k.......o...........W........................\n.A..Y..........U.................a........6.......\n..A...Y.p...................................6.....\nB......k..........................Z............u..\n...3.....................s..............a.........\n......A.........................g.....a...........\n.......A....8...b.U......H....sS..................\n.........................S1.............t.........\n.....................9z..e.....5..1.g.u...........\n.......................z....d....g....H.J....o.6..\n........B................d.....u....9.J.H.........\n.8........S.................u9.............J.....H\n.....................Z5.............t1...........a\n.....................e..v...................o..t..\n.....8...............L.....z.............J........"}
44
+
|> String.split("\n", trim: true)
45
+
|> Enum.with_index()
46
+
|> Enum.flat_map(fn {row, y} ->
48
+
|> String.to_charlist()
49
+
|> Enum.with_index()
50
+
|> Enum.filter(fn {freq, _} -> freq != ?. end)
51
+
|> Enum.map(fn {freq, x} -> {{x, y}, freq} end)
54
+
|> Enum.group_by(&elem(&1, 1), &elem(&1, 0))
57
+
<!-- livebook:{"output":true} -->
60
+
warning: code block contains unused literal "............\n........0...\n.....0......\n.......0....\n....0.......\n......A.....\n............\n............\n........A...\n.........A..\n............\n............\n" (remove the literal or assign it to _ to avoid warnings)
61
+
└─ Workspace/hauleth/advent-of-code/2024/day08.livemd#cell:y5uv5vxll4fey6gh:1
65
+
<!-- livebook:{"output":true} -->
69
+
117 => [{28, 46}, {31, 45}, {38, 43}, {47, 38}],
70
+
73 => [{2, 32}, {17, 34}, {23, 27}, {6, 29}],
71
+
89 => [{4, 36}, {7, 32}, {6, 37}, {5, 27}],
72
+
48 => [{25, 22}, {9, 21}, {8, 23}, {14, 24}],
73
+
57 => [{29, 46}, {21, 43}, {36, 45}],
74
+
113 => [{30, 9}, {20, 2}, {21, 4}, {19, 1}],
75
+
69 => [{42, 18}, {34, 21}, {45, 23}, {29, 14}],
76
+
88 => [{7, 10}, {5, 3}, {44, 13}, {2, 8}],
77
+
100 => [{25, 45}, {28, 44}, {10, 31}],
78
+
71 => [{36, 1}, {35, 25}, {31, 2}, {32, 8}],
79
+
98 => [{16, 41}, {7, 33}, {20, 34}, {17, 30}],
80
+
81 => [{42, 19}, {41, 16}, {43, 25}, {32, 2}],
81
+
76 => [{12, 9}, {14, 6}, {17, 8}, {21, 49}],
82
+
85 => [{15, 36}, {12, 28}, {17, 31}, {18, 41}],
83
+
120 => [{27, 5}, {35, 8}, {28, 11}, {24, 12}],
84
+
109 => [{26, 1}, {39, 6}, {40, 12}, {31, 7}],
85
+
72 => [{38, 44}, {40, 45}, {49, 46}, {25, 41}],
86
+
110 => [{8, 26}, {7, 21}, {15, 18}, {6, 23}],
87
+
68 => [{30, 27}, {28, 24}, {27, 28}, {33, 23}],
88
+
86 => [{29, 13}, {33, 16}, {30, 12}, {34, 11}],
89
+
116 => [{35, 23}, {36, 47}, {47, 48}, {40, 42}],
90
+
51 => [{7, 24}, {0, 19}, {3, 39}, {4, 32}],
91
+
80 => [{18, 7}, {19, 24}, {10, 8}, {11, 5}],
92
+
77 => [{11, 7}, {15, 14}, {10, 0}, {4, 5}],
93
+
78 => [{22, 14}, {29, 16}, {36, 13}, {23, 9}],
94
+
108 => [{29, 2}, {28, 5}, {35, 1}],
95
+
103 => [{32, 40}, {36, 43}, {33, 44}],
96
+
122 => [{27, 49}, {23, 44}, {24, 24}, {22, 43}],
97
+
83 => [{10, 46}, {25, 42}, {31, 41}, {8, 11}],
98
+
74 => [{38, 45}, {41, 49}, {43, 46}, {40, 44}],
99
+
99 => [{31, 22}, {33, 31}, {20, 19}, {6, 18}],
100
+
112 => [{5, 33}, {17, 26}, {8, 37}, {0, 34}],
101
+
97 => [{38, 40}, {33, 36}, {49, 47}, {40, 39}],
102
+
104 => [{16, 21}, {19, 31}, {11, 20}, {18, 24}],
103
+
75 => [{30, 5}, {24, 6}, {23, 10}, {37, 27}],
104
+
90 => [{21, 47}, {47, 30}, {34, 38}, {38, 29}],
105
+
55 => [{15, 22}, {14, 26}, {8, 27}, {25, 33}],
106
+
52 => [{45, 3}, {38, 11}, {39, 10}, {46, 8}],
107
+
111 => [{13, 35}, {42, 7}, {45, 44}, {44, 48}],
108
+
87 => [{25, 35}, {12, 18}, {14, 31}, {21, 28}],
109
+
119 => [{21, 23}, {18, 31}, {17, 18}, {16, 24}],
110
+
82 => [{12, 11}, {27, 13}, {21, 12}, {16, 8}],
111
+
53 => [{22, 47}, {31, 43}, {4, 30}],
112
+
50 => [{27, 2}, {24, 22}, {44, 5}, {49, 21}],
113
+
66 => [{8, 45}, {9, 30}, {3, 1}, {0, ...}],
114
+
70 => [{5, 14}, {41, 15}, {10, ...}, {...}],
115
+
56 => [{12, 41}, {4, ...}, {...}, ...],
116
+
102 => [{17, ...}, {...}, ...],
117
+
105 => [{...}, ...],
126
+
|> String.split("\n", trim: true)
127
+
|> then(fn [a | _] = lst ->
128
+
{byte_size(a), length(lst)}
132
+
<!-- livebook:{"output":true} -->
139
+
defmodule Antennas do
140
+
def each_pair([]), do: []
141
+
def each_pair([a | rest]) do
142
+
for(b <- rest, do: {a, b}) ++ each_pair(rest)
145
+
def antinodes({xa, ya}, {xb, yb}) do
149
+
Stream.from_index()
150
+
|> Stream.flat_map(fn n ->
153
+
[{xa + dx, ya + dy}, {xb - dx, yb - dy}]
159
+
<!-- livebook:{"output":true} -->
162
+
{:module, Antennas, <<70, 79, 82, 49, 0, 0, 10, ...>>, {:antinodes, 2}}
169
+
for {_, antennas} <- freqs,
170
+
{a, b} <- Antennas.each_pair(antennas),
171
+
{x, y} = node <- Antennas.antinodes(a, b) |> Stream.drop(2) |> Enum.take(2),
172
+
x in 0..(w - 1) and y in 0..(h - 1),
173
+
into: MapSet.new() do
178
+
<!-- livebook:{"output":true} -->
237
+
MapSet.size(antinodes)
240
+
<!-- livebook:{"output":true} -->
250
+
for {_, antennas} <- freqs,
251
+
{a, b} <- Antennas.each_pair(antennas),
252
+
{x, y} = node <- Enum.take(Antennas.antinodes(a, b), 100),
253
+
x in 0..(w - 1) and y in 0..(h - 1),
254
+
into: MapSet.new() do
259
+
<!-- livebook:{"output":true} -->
318
+
MapSet.size(antinodes_res)
321
+
<!-- livebook:{"output":true} -->
327
+
<!-- livebook:{"offset":9159,"stamp":{"token":"XCP.vUy-wiQ1Ola4DEyyjRWCHAhmtmjmoDVd4jyZ0g5rhe0RM8-OKii82hOqtdVQ6B_yetZ17Z8avgol_Frq-whc91b45zMSMIRVIC-azF_IQmYLdHX0p3LEQ0xKLcBUuir19OQ","version":2}} -->
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