commit 7889fd6eef65803c56d676e5661d2e9c46e08e1f · hauleth.dev/advent-of-code

+102

2021/day14.txt

··· 1 + OFSNKKHCBSNKBKFFCVNB 2 + 3 + KC -> F 4 + CO -> S 5 + FH -> K 6 + VP -> P 7 + KF -> S 8 + SV -> O 9 + CB -> H 10 + PN -> F 11 + NC -> N 12 + BC -> F 13 + NP -> O 14 + SK -> F 15 + HS -> C 16 + SN -> V 17 + OP -> F 18 + ON -> N 19 + FK -> N 20 + SH -> B 21 + HN -> N 22 + BO -> V 23 + VK -> H 24 + SC -> K 25 + KP -> O 26 + VO -> V 27 + HC -> P 28 + BK -> B 29 + VH -> N 30 + PV -> O 31 + HB -> H 32 + VS -> F 33 + KK -> B 34 + HH -> B 35 + CF -> F 36 + PH -> C 37 + NS -> V 38 + SO -> P 39 + NV -> K 40 + BP -> N 41 + SF -> V 42 + SS -> K 43 + FP -> N 44 + PC -> S 45 + OH -> B 46 + CH -> H 47 + VV -> S 48 + VN -> O 49 + OB -> K 50 + PF -> H 51 + CS -> C 52 + PP -> O 53 + NF -> H 54 + SP -> P 55 + OS -> V 56 + BB -> P 57 + NO -> F 58 + VB -> V 59 + HK -> C 60 + NK -> O 61 + HP -> B 62 + HV -> V 63 + BF -> V 64 + KO -> F 65 + BV -> H 66 + KV -> B 67 + OF -> V 68 + NB -> F 69 + VF -> C 70 + PB -> B 71 + FF -> H 72 + CP -> C 73 + KH -> H 74 + NH -> P 75 + PS -> P 76 + PK -> P 77 + CC -> K 78 + BS -> V 79 + SB -> K 80 + OO -> B 81 + OK -> F 82 + BH -> B 83 + CV -> F 84 + FN -> V 85 + CN -> P 86 + KB -> B 87 + FO -> H 88 + PO -> S 89 + HO -> H 90 + CK -> B 91 + KN -> C 92 + FS -> K 93 + OC -> P 94 + FV -> N 95 + OV -> K 96 + BN -> H 97 + HF -> V 98 + VC -> S 99 + FB -> S 100 + NN -> P 101 + FC -> B 102 + KS -> N

+100

2021/day15.txt

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+1

2021/day16.txt

···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

+802

2021/solutions.livemd

··· 1159 1159 ``` 1160 1160 1161 1161 ## Day 14 1162 + 1163 + ```elixir 1164 + [polymer_raw, subs] = 1165 + File.read!("day14.txt") 1166 + |> String.split("\n\n") 1167 + 1168 + <<first, _::binary>> = polymer_raw 1169 + 1170 + polymer = 1171 + {first, 1172 + polymer_raw 1173 + |> String.to_charlist() 1174 + |> Enum.chunk_every(2, 1, :discard) 1175 + |> Enum.frequencies()} 1176 + 1177 + subs = 1178 + subs 1179 + |> String.trim() 1180 + |> String.split(["\n", " -> "]) 1181 + |> Enum.chunk_every(2) 1182 + |> Map.new(fn [pair, <<new>>] -> {String.to_charlist(pair), new} end) 1183 + 1184 + defmodule Day14 do 1185 + def expand({hd, polymer}, subs) do 1186 + new = 1187 + polymer 1188 + |> Enum.reduce(%{}, fn {[a, b] = pair, count}, acc -> 1189 + s = Map.fetch!(subs, pair) 1190 + 1191 + acc 1192 + |> Map.update([a, s], count, &(&1 + count)) 1193 + |> Map.update([s, b], count, &(&1 + count)) 1194 + end) 1195 + 1196 + {hd, new} 1197 + end 1198 + 1199 + def expand_naive(polymer, subs) do 1200 + polymer 1201 + |> to_charlist() 1202 + |> Enum.chunk_every(2, 1, :discard) 1203 + |> Enum.flat_map(fn [a, b] = pair -> 1204 + [a, subs[pair], b] 1205 + end) 1206 + |> List.to_string() 1207 + end 1208 + 1209 + def frequencies({hd, polymer}) do 1210 + polymer 1211 + |> Enum.reduce(%{hd => 1}, fn {[_, b], count}, acc -> 1212 + Map.update(acc, b, count, &(&1 + count)) 1213 + end) 1214 + end 1215 + end 1216 + ``` 1217 + 1218 + ```output 1219 + {:module, Day14, <<70, 79, 82, 49, 0, 0, 13, ...>>, {:frequencies, 1}} 1220 + ``` 1221 + 1222 + ```elixir 1223 + {{_, min}, {_, max}} = 1224 + 1..10 1225 + |> Enum.reduce(polymer, fn _, acc -> 1226 + Day14.expand(acc, subs) 1227 + end) 1228 + |> Day14.frequencies() 1229 + |> Enum.min_max_by(&elem(&1, 1)) 1230 + 1231 + # 2768 1232 + max - min 1233 + ``` 1234 + 1235 + ```output 1236 + 2768 1237 + ``` 1238 + 1239 + ```elixir 1240 + {{_, min}, {_, max}} = 1241 + 1..40 1242 + |> Enum.reduce(polymer, fn _, acc -> 1243 + Day14.expand(acc, subs) 1244 + end) 1245 + |> Day14.frequencies() 1246 + |> Enum.min_max_by(&elem(&1, 1)) 1247 + 1248 + max - min 1249 + ``` 1250 + 1251 + ```output 1252 + 2914365137499 1253 + ``` 1254 + 1255 + ## Day 15 1256 + 1257 + ```elixir 1258 + input = 1259 + File.read!("day15.txt") 1260 + |> String.trim() 1261 + |> String.split("\n") 1262 + |> Enum.map(&String.to_charlist/1) 1263 + |> Enum.with_index() 1264 + |> Enum.flat_map(fn {row, y} -> 1265 + row 1266 + |> Enum.with_index() 1267 + |> Enum.map(fn {v, x} -> {{x, y}, v - ?0} end) 1268 + end) 1269 + |> Map.new() 1270 + 1271 + {width, height} = Enum.max(Map.keys(input)) 1272 + ``` 1273 + 1274 + ```output 1275 + {99, 99} 1276 + ``` 1277 + 1278 + ```elixir 1279 + shortest_paths = 1280 + for y <- height..0//-1, 1281 + x <- width..0//-1, 1282 + reduce: %{} do 1283 + acc -> 1284 + right = acc[{x + 1, y}] 1285 + bottom = acc[{x, y + 1}] 1286 + 1287 + value = 1288 + case {right, bottom} do 1289 + {nil, nil} -> input[{x, y}] 1290 + _ -> input[{x, y}] + min(right, bottom) 1291 + end 1292 + 1293 + Map.put(acc, {x, y}, value) 1294 + end 1295 + 1296 + shortest_paths[{0, 0}] - input[{0, 0}] 1297 + ``` 1298 + 1299 + ```output 1300 + 429 1301 + ``` 1302 + 1303 + ```elixir 1304 + defmodule Day15.Task2 do 1305 + def expand_grid(board) do 1306 + {width, height} = Enum.max(Map.keys(board)) 1307 + 1308 + board 1309 + |> Enum.flat_map(fn {{x, y}, v} -> 1310 + for rx <- 0..4, ry <- 0..4 do 1311 + {{x + (width + 1) * rx, y + (height + 1) * ry}, rem(v - 1 + rx + ry, 9) + 1} 1312 + end 1313 + end) 1314 + |> Map.new() 1315 + end 1316 + 1317 + def find_path(board, start, finish) do 1318 + dists = :gb_sets.singleton({0, start}) 1319 + 1320 + find_path(board, finish, dists, MapSet.new()) 1321 + end 1322 + 1323 + @surround for dx <- -1..1, dy <- -1..1, abs(dx) != abs(dy), do: {dx, dy} 1324 + 1325 + def find_path(board, finish, dists, visited) do 1326 + {{dist, {x, y} = curr}, dists} = :gb_sets.take_smallest(dists) 1327 + 1328 + if curr == finish do 1329 + dist 1330 + else 1331 + visited = MapSet.put(visited, curr) 1332 + 1333 + dists = 1334 + for {dx, dy} <- @surround, 1335 + next = {x + dx, y + dy}, 1336 + next not in visited, 1337 + is_map_key(board, next), 1338 + alt = dist + board[next], 1339 + reduce: dists do 1340 + acc -> 1341 + :gb_sets.add_element({alt, next}, acc) 1342 + end 1343 + 1344 + find_path(board, finish, dists, visited) 1345 + end 1346 + end 1347 + end 1348 + ``` 1349 + 1350 + ```output 1351 + {:module, Day15.Task2, <<70, 79, 82, 49, 0, 0, 16, ...>>, {:find_path, 4}} 1352 + ``` 1353 + 1354 + ```elixir 1355 + input 1356 + |> Day15.Task2.expand_grid() 1357 + |> Day15.Task2.find_path({0, 0}, {499, 499}) 1358 + ``` 1359 + 1360 + ```output 1361 + 2844 1362 + ``` 1363 + 1364 + ## Day 16 1365 + 1366 + ```elixir 1367 + defmodule Day16 do 1368 + defmodule Packet do 1369 + defstruct [:version, :type, :value] 1370 + end 1371 + 1372 + def decode(<<version::3, 4::3, rest::bitstring>>) do 1373 + {value, rest} = literal(rest, 0) 1374 + 1375 + {%Packet{type: 4, version: version, value: value}, rest} 1376 + end 1377 + 1378 + def decode(<<version::3, type::3, 0::1, length::15, rest::bitstring>>) do 1379 + <<subpackets::bitstring-size(length), rest::bitstring>> = rest 1380 + 1381 + {%Packet{type: type, version: version, value: decode_all(subpackets)}, rest} 1382 + end 1383 + 1384 + def decode(<<version::3, type::3, 1::1, length::11, rest::bitstring>>) do 1385 + {value, rest} = Enum.map_reduce(1..length, rest, fn _, acc -> decode(acc) end) 1386 + 1387 + {%Packet{type: type, version: version, value: value}, rest} 1388 + end 1389 + 1390 + def decode_all(input) do 1391 + case decode(input) do 1392 + {packet, <<>>} -> [packet] 1393 + {packet, rest} -> [packet | decode_all(rest)] 1394 + end 1395 + end 1396 + 1397 + defp literal(<<1::1, bits::4, rest::bitstring>>, acc) do 1398 + literal(rest, acc * 0x10 + bits) 1399 + end 1400 + 1401 + defp literal(<<0::1, bits::4, rest::bitstring>>, acc) do 1402 + {acc * 0x10 + bits, rest} 1403 + end 1404 + end 1405 + 1406 + input = 1407 + File.read!("day16.txt") 1408 + |> String.trim() 1409 + |> Base.decode16!() 1410 + |> Day16.decode() 1411 + |> elem(0) 1412 + ``` 1413 + 1414 + ```output 1415 + %Day16.Packet{ 1416 + type: 0, 1417 + value: [ 1418 + %Day16.Packet{ 1419 + type: 1, 1420 + value: [ 1421 + %Day16.Packet{type: 4, value: 20, version: 6}, 1422 + %Day16.Packet{ 1423 + type: 6, 1424 + value: [ 1425 + %Day16.Packet{type: 4, value: 14747, version: 1}, 1426 + %Day16.Packet{type: 4, value: 14747, version: 6} 1427 + ], 1428 + version: 2 1429 + } 1430 + ], 1431 + version: 1 1432 + }, 1433 + %Day16.Packet{ 1434 + type: 3, 1435 + value: [ 1436 + %Day16.Packet{type: 4, value: 15, version: 5}, 1437 + %Day16.Packet{type: 4, value: 10, version: 6} 1438 + ], 1439 + version: 7 1440 + }, 1441 + %Day16.Packet{ 1442 + type: 1, 1443 + value: [ 1444 + %Day16.Packet{ 1445 + type: 7, 1446 + value: [ 1447 + %Day16.Packet{type: 4, value: 2184, version: 1}, 1448 + %Day16.Packet{type: 4, value: 130250, version: 6} 1449 + ], 1450 + version: 6 1451 + }, 1452 + %Day16.Packet{type: 4, value: 5442981, version: 4} 1453 + ], 1454 + version: 6 1455 + }, 1456 + %Day16.Packet{type: 4, value: 8281083, version: 0}, 1457 + %Day16.Packet{ 1458 + type: 2, 1459 + value: [ 1460 + %Day16.Packet{type: 4, value: 102, version: 5}, 1461 + %Day16.Packet{type: 4, value: 647125, version: 7} 1462 + ], 1463 + version: 1 1464 + }, 1465 + %Day16.Packet{ 1466 + type: 1, 1467 + value: [ 1468 + %Day16.Packet{type: 4, value: 178, version: 1}, 1469 + %Day16.Packet{type: 4, value: 176, version: 6} 1470 + ], 1471 + version: 0 1472 + }, 1473 + %Day16.Packet{ 1474 + type: 1, 1475 + value: [ 1476 + %Day16.Packet{ 1477 + type: 6, 1478 + value: [ 1479 + %Day16.Packet{ 1480 + type: 0, 1481 + value: [ 1482 + %Day16.Packet{type: 4, value: 13, version: 1}, 1483 + %Day16.Packet{type: 4, value: 8, version: 4}, 1484 + %Day16.Packet{type: 4, value: 4, version: 3} 1485 + ], 1486 + version: 2 1487 + }, 1488 + %Day16.Packet{ 1489 + type: 0, 1490 + value: [ 1491 + %Day16.Packet{type: 4, value: 7, version: 7}, 1492 + %Day16.Packet{type: 4, value: 11, version: 3}, 1493 + %Day16.Packet{type: 4, value: 14, version: 2} 1494 + ], 1495 + version: 4 1496 + } 1497 + ], 1498 + version: 7 1499 + }, 1500 + %Day16.Packet{type: 4, value: 2724, version: 0} 1501 + ], 1502 + version: 1 1503 + }, 1504 + %Day16.Packet{type: 4, value: 9, version: 4}, 1505 + %Day16.Packet{ 1506 + type: 1, 1507 + value: [ 1508 + %Day16.Packet{ 1509 + type: 5, 1510 + value: [ 1511 + %Day16.Packet{type: 4, value: 7240238, version: 2}, 1512 + %Day16.Packet{type: 4, value: 233, version: 7} 1513 + ], 1514 + version: 1 1515 + }, 1516 + %Day16.Packet{type: 4, value: 37, version: 6} 1517 + ], 1518 + version: 4 1519 + }, 1520 + %Day16.Packet{type: 2, value: [%Day16.Packet{type: 4, value: 2, version: 5}], version: 5}, 1521 + %Day16.Packet{type: 4, value: 53749, version: 4}, 1522 + %Day16.Packet{type: 4, value: 11, version: 3}, 1523 + %Day16.Packet{ 1524 + type: 1, 1525 + value: [ 1526 + %Day16.Packet{type: 4, value: 382979, version: 4}, 1527 + %Day16.Packet{ 1528 + type: 5, 1529 + value: [ 1530 + %Day16.Packet{ 1531 + type: 0, 1532 + value: [ 1533 + %Day16.Packet{type: 4, value: 15, version: 1}, 1534 + %Day16.Packet{type: 4, value: 10, version: 0}, 1535 + %Day16.Packet{type: 4, value: 2, version: 6} 1536 + ], 1537 + version: 5 1538 + }, 1539 + %Day16.Packet{ 1540 + type: 0, 1541 + value: [ 1542 + %Day16.Packet{type: 4, value: 4, version: 7}, 1543 + %Day16.Packet{type: 4, value: 7, version: 4}, 1544 + %Day16.Packet{type: 4, value: 2, version: 5} 1545 + ], 1546 + version: 1 1547 + } 1548 + ], 1549 + version: 6 1550 + } 1551 + ], 1552 + version: 2 1553 + }, 1554 + %Day16.Packet{type: 4, value: 21251, version: 1}, 1555 + %Day16.Packet{ 1556 + type: 1, 1557 + value: [ 1558 + %Day16.Packet{type: 4, value: 163, version: 6}, 1559 + %Day16.Packet{ 1560 + type: 5, 1561 + value: [ 1562 + %Day16.Packet{type: 4, value: 59, version: 3}, 1563 + %Day16.Packet{type: 4, value: 836848134220, version: 1} 1564 + ], 1565 + version: 6 1566 + } 1567 + ], 1568 + version: 2 1569 + }, 1570 + %Day16.Packet{ 1571 + type: 2, 1572 + value: [ 1573 + %Day16.Packet{ 1574 + type: 0, 1575 + value: [ 1576 + %Day16.Packet{ 1577 + type: 0, 1578 + value: [ 1579 + %Day16.Packet{ 1580 + type: 2, 1581 + value: [ 1582 + %Day16.Packet{ 1583 + type: 2, 1584 + value: [ 1585 + %Day16.Packet{ 1586 + type: 0, 1587 + value: [ 1588 + %Day16.Packet{ 1589 + type: 3, 1590 + value: [ 1591 + %Day16.Packet{ 1592 + type: 2, 1593 + value: [ 1594 + %Day16.Packet{ 1595 + type: 2, 1596 + value: [ 1597 + %Day16.Packet{ 1598 + type: 3, 1599 + value: [%Day16.Packet{type: 0, value: [...], ...}], 1600 + version: 0 1601 + } 1602 + ], 1603 + version: 1 1604 + } 1605 + ], 1606 + version: 1 1607 + } 1608 + ], 1609 + version: 7 1610 + } 1611 + ], 1612 + version: 0 1613 + } 1614 + ], 1615 + version: 6 1616 + } 1617 + ], 1618 + version: 2 1619 + } 1620 + ], 1621 + version: 2 1622 + } 1623 + ], 1624 + version: 6 1625 + } 1626 + ], 1627 + version: 7 1628 + }, 1629 + %Day16.Packet{type: 1, value: [%Day16.Packet{type: 4, value: 44, version: 4}], version: 7}, 1630 + %Day16.Packet{ 1631 + type: 1, 1632 + value: [ 1633 + %Day16.Packet{type: 4, value: 255, version: 2}, 1634 + %Day16.Packet{type: 4, value: 91, version: 5}, 1635 + %Day16.Packet{type: 4, value: 176, version: 5}, 1636 + %Day16.Packet{type: 4, value: 23, version: 1} 1637 + ], 1638 + version: 7 1639 + }, 1640 + %Day16.Packet{ 1641 + type: 3, 1642 + value: [ 1643 + %Day16.Packet{type: 4, value: 11520, version: 4}, 1644 + %Day16.Packet{type: 4, value: 6069, version: 0}, 1645 + %Day16.Packet{type: 4, value: 1089149511401, version: 4}, 1646 + %Day16.Packet{type: 4, value: 158, version: 2}, 1647 + %Day16.Packet{type: 4, value: 620605, version: 0} 1648 + ], 1649 + version: 2 1650 + }, 1651 + %Day16.Packet{ 1652 + type: 0, 1653 + value: [ 1654 + %Day16.Packet{type: 4, value: 62788, version: 7}, 1655 + %Day16.Packet{type: 4, value: 9410622, version: 2}, 1656 + %Day16.Packet{type: 4, value: 15912821, version: 4} 1657 + ], 1658 + version: 4 1659 + }, 1660 + %Day16.Packet{ 1661 + type: 1, 1662 + value: [ 1663 + %Day16.Packet{type: 4, value: 22416, version: 5}, 1664 + %Day16.Packet{ 1665 + type: 5, 1666 + value: [ 1667 + %Day16.Packet{type: 4, value: 246, version: 1}, 1668 + %Day16.Packet{type: 4, value: 246, version: 4} 1669 + ], 1670 + version: 2 1671 + } 1672 + ], 1673 + version: 0 1674 + }, 1675 + %Day16.Packet{type: 3, value: [%Day16.Packet{type: 4, value: 13008601, version: 5}], version: 0}, 1676 + %Day16.Packet{ 1677 + type: 0, 1678 + value: [ 1679 + %Day16.Packet{ 1680 + type: 1, 1681 + value: [ 1682 + %Day16.Packet{type: 4, value: 3, version: 4}, 1683 + %Day16.Packet{type: 4, value: 14, version: 1}, 1684 + %Day16.Packet{type: 4, value: 5, version: 0} 1685 + ], 1686 + version: 5 1687 + }, 1688 + %Day16.Packet{ 1689 + type: 1, 1690 + value: [ 1691 + %Day16.Packet{type: 4, value: 2, version: 1}, 1692 + %Day16.Packet{type: 4, value: 14, version: 1}, 1693 + %Day16.Packet{type: 4, value: 10, version: 1} 1694 + ], 1695 + version: 6 1696 + }, 1697 + %Day16.Packet{ 1698 + type: 1, 1699 + value: [ 1700 + %Day16.Packet{type: 4, value: 8, version: 3}, 1701 + %Day16.Packet{type: 4, value: 6, version: 6}, 1702 + %Day16.Packet{type: 4, value: 11, version: 0} 1703 + ], 1704 + version: 1 1705 + } 1706 + ], 1707 + version: 5 1708 + }, 1709 + %Day16.Packet{ 1710 + type: 1, 1711 + value: [ 1712 + %Day16.Packet{type: 4, value: 32940592237, version: 2}, 1713 + %Day16.Packet{ 1714 + type: 5, 1715 + value: [ 1716 + %Day16.Packet{type: 4, value: 100, version: 1}, 1717 + %Day16.Packet{type: 4, value: 1393232728, version: 2} 1718 + ], 1719 + version: 2 1720 + } 1721 + ], 1722 + version: 0 1723 + }, 1724 + %Day16.Packet{type: 4, value: 89, version: 3}, 1725 + %Day16.Packet{ 1726 + type: 2, 1727 + value: [ 1728 + %Day16.Packet{type: 4, value: 204, version: 6}, 1729 + %Day16.Packet{type: 4, value: 260321821, version: 2}, 1730 + %Day16.Packet{type: 4, value: 225241983, version: 6} 1731 + ], 1732 + version: 0 1733 + }, 1734 + %Day16.Packet{ 1735 + type: 0, 1736 + value: [ 1737 + %Day16.Packet{type: 4, value: 960899, version: 3}, 1738 + %Day16.Packet{type: 4, value: 58997, version: 5}, 1739 + %Day16.Packet{type: 4, value: 54940, version: 6}, 1740 + %Day16.Packet{type: 4, value: 10974, version: 2}, 1741 + %Day16.Packet{type: 4, value: 882043, version: 2} 1742 + ], 1743 + version: 0 1744 + }, 1745 + %Day16.Packet{ 1746 + type: 1, 1747 + value: [ 1748 + %Day16.Packet{ 1749 + type: 6, 1750 + value: [ 1751 + %Day16.Packet{type: 4, value: 35633017255, version: 4}, 1752 + %Day16.Packet{type: 4, value: 35633017255, version: 2} 1753 + ], 1754 + version: 3 1755 + }, 1756 + %Day16.Packet{type: 4, value: 1359, version: 6} 1757 + ], 1758 + version: 6 1759 + }, 1760 + %Day16.Packet{ 1761 + type: 1, 1762 + value: [ 1763 + %Day16.Packet{type: 4, value: 92, version: 4}, 1764 + %Day16.Packet{type: 4, value: 38, version: 3}, 1765 + %Day16.Packet{type: 4, value: 160, version: 5}, 1766 + %Day16.Packet{type: 4, value: 111, version: 1}, 1767 + %Day16.Packet{type: 4, value: 64, version: 4} 1768 + ], 1769 + version: 4 1770 + }, 1771 + %Day16.Packet{ 1772 + type: 0, 1773 + value: [ 1774 + %Day16.Packet{type: 4, value: 2541, version: 3}, 1775 + %Day16.Packet{type: 4, value: 263947, version: 6}, 1776 + %Day16.Packet{type: 4, value: 7686705, version: 5}, 1777 + %Day16.Packet{type: 4, value: 31, version: 4} 1778 + ], 1779 + version: 2 1780 + }, 1781 + %Day16.Packet{ 1782 + type: 1, 1783 + value: [ 1784 + %Day16.Packet{ 1785 + type: 6, 1786 + value: [ 1787 + %Day16.Packet{type: 4, value: 3193865, version: 1}, 1788 + %Day16.Packet{type: 4, value: 20223, version: 7} 1789 + ], 1790 + version: 2 1791 + }, 1792 + %Day16.Packet{type: 4, value: 9328522, version: 5} 1793 + ], 1794 + version: 0 1795 + }, 1796 + %Day16.Packet{ 1797 + type: 2, 1798 + value: [ 1799 + %Day16.Packet{type: 4, value: 5, version: 4}, 1800 + %Day16.Packet{type: 4, value: 7, version: 3}, 1801 + %Day16.Packet{type: 4, value: 179420284, version: 4}, 1802 + %Day16.Packet{type: 4, value: 19890, version: 1}, 1803 + %Day16.Packet{type: 4, value: 2655, version: 0} 1804 + ], 1805 + version: 7 1806 + }, 1807 + %Day16.Packet{ 1808 + type: 1, 1809 + value: [ 1810 + %Day16.Packet{type: 4, value: 862089, version: 1}, 1811 + %Day16.Packet{ 1812 + type: 6, 1813 + value: [ 1814 + %Day16.Packet{type: 4, value: 248, version: 3}, 1815 + %Day16.Packet{type: 4, value: 3286, version: 5} 1816 + ], 1817 + version: 3 1818 + } 1819 + ], 1820 + version: 3 1821 + }, 1822 + %Day16.Packet{ 1823 + type: 1, 1824 + value: [ 1825 + %Day16.Packet{type: 4, value: 93, version: 6}, 1826 + %Day16.Packet{ 1827 + type: 5, 1828 + value: [ 1829 + %Day16.Packet{type: 4, value: 4269, version: 6}, 1830 + %Day16.Packet{type: 4, value: 240, version: 3} 1831 + ], 1832 + version: 4 1833 + } 1834 + ], 1835 + version: 5 1836 + }, 1837 + %Day16.Packet{ 1838 + type: 3, 1839 + value: [ 1840 + %Day16.Packet{type: 4, value: 2938, version: 6}, 1841 + %Day16.Packet{type: 4, value: 3, version: 6}, 1842 + %Day16.Packet{type: 4, value: 211, version: 7} 1843 + ], 1844 + version: 3 1845 + }, 1846 + %Day16.Packet{ 1847 + type: 1, 1848 + value: [ 1849 + %Day16.Packet{ 1850 + type: 7, 1851 + value: [ 1852 + %Day16.Packet{type: 4, value: 159, version: 0}, 1853 + %Day16.Packet{type: 4, value: 159, version: 5} 1854 + ], 1855 + version: 0 1856 + }, 1857 + %Day16.Packet{type: 4, value: 28, version: 1} 1858 + ], 1859 + version: 4 1860 + }, 1861 + %Day16.Packet{type: 4, value: 84, version: 4}, 1862 + %Day16.Packet{ 1863 + type: 1, 1864 + value: [ 1865 + %Day16.Packet{type: 4, value: 235, version: 4}, 1866 + %Day16.Packet{ 1867 + type: 6, 1868 + value: [ 1869 + %Day16.Packet{type: 0, value: [%Day16.Packet{...}, ...], version: 4}, 1870 + %Day16.Packet{type: 0, value: [...], ...} 1871 + ], 1872 + version: 3 1873 + } 1874 + ], 1875 + version: 6 1876 + }, 1877 + %Day16.Packet{type: 4, value: 1425, version: 4}, 1878 + %Day16.Packet{ 1879 + type: 1, 1880 + value: [ 1881 + %Day16.Packet{ 1882 + type: 7, 1883 + value: [%Day16.Packet{type: 0, value: [...], ...}, %Day16.Packet{type: 0, ...}], 1884 + version: 5 1885 + }, 1886 + %Day16.Packet{type: 4, value: 13, version: 2} 1887 + ], 1888 + version: 2 1889 + }, 1890 + %Day16.Packet{type: 0, value: [%Day16.Packet{type: 4, value: 3121, version: 6}], version: 5}, 1891 + %Day16.Packet{ 1892 + type: 1, 1893 + value: [ 1894 + %Day16.Packet{type: 4, value: 51, version: 2}, 1895 + %Day16.Packet{type: 4, value: 61, ...}, 1896 + %Day16.Packet{type: 4, ...} 1897 + ], 1898 + version: 4 1899 + }, 1900 + %Day16.Packet{ 1901 + type: 1, 1902 + value: [%Day16.Packet{type: 4, value: 1393, ...}, %Day16.Packet{type: 5, ...}], 1903 + version: 3 1904 + }, 1905 + %Day16.Packet{type: 1, value: [%Day16.Packet{type: 7, ...}, %Day16.Packet{...}], version: 3}, 1906 + %Day16.Packet{type: 1, value: [%Day16.Packet{...}, ...], version: 7}, 1907 + %Day16.Packet{type: 3, value: [...], ...}, 1908 + %Day16.Packet{type: 2, ...}, 1909 + %Day16.Packet{...}, 1910 + ... 1911 + ], 1912 + version: 3 1913 + } 1914 + ``` 1915 + 1916 + ```elixir 1917 + defmodule Day16.Task1 do 1918 + alias Day16.Packet 1919 + 1920 + def sum(%Packet{type: 4, version: version}), do: version 1921 + 1922 + def sum(%Packet{version: version, value: value}) do 1923 + Enum.reduce(value, version, &(sum(&1) + &2)) 1924 + end 1925 + end 1926 + 1927 + Day16.Task1.sum(input) 1928 + ``` 1929 + 1930 + ```output 1931 + 949 1932 + ``` 1933 + 1934 + ```elixir 1935 + defmodule Day16.Task2 do 1936 + alias Day16.Packet 1937 + 1938 + def evaluate(%Packet{type: 0} = packet), do: reduce(packet, 0, &+/2) 1939 + def evaluate(%Packet{type: 1} = packet), do: reduce(packet, 1, &*/2) 1940 + def evaluate(%Packet{type: 2} = packet), do: reduce(packet, :inf, &min/2) 1941 + def evaluate(%Packet{type: 3} = packet), do: reduce(packet, 0, &max/2) 1942 + 1943 + def evaluate(%Packet{type: 4, value: value}), do: value 1944 + 1945 + def evaluate(%Packet{type: 5} = packet), do: compare(packet, &>/2) 1946 + def evaluate(%Packet{type: 6} = packet), do: compare(packet, &</2) 1947 + def evaluate(%Packet{type: 7} = packet), do: compare(packet, &==/2) 1948 + 1949 + defp reduce(%Packet{value: value}, initial, op) do 1950 + Enum.reduce(value, initial, &op.(evaluate(&1), &2)) 1951 + end 1952 + 1953 + defp compare(%Packet{value: [a, b]}, op) do 1954 + if op.(evaluate(a), evaluate(b)), do: 1, else: 0 1955 + end 1956 + end 1957 + 1958 + Day16.Task2.evaluate(input) 1959 + ``` 1960 + 1961 + ```output 1962 + 1114600142730 1963 + ```