diff --git a/advent-of-code-2023.csproj b/advent-of-code-2023.csproj index b3ea4c9..7545f36 100644 --- a/advent-of-code-2023.csproj +++ b/advent-of-code-2023.csproj @@ -38,6 +38,8 @@ + + diff --git a/inputs/05.txt b/inputs/05.txt new file mode 100644 index 0000000..aac101c --- /dev/null +++ b/inputs/05.txt @@ -0,0 +1,190 @@ +seeds: 1636419363 608824189 3409451394 227471750 12950548 91466703 1003260108 224873703 440703838 191248477 634347552 275264505 3673953799 67839674 2442763622 237071609 3766524590 426344831 1433781343 153722422 + +seed-to-soil map: +2067746708 2321931404 124423068 +2774831547 3357841131 95865403 +3776553292 3323317283 34523848 +4167907733 3453706534 116376261 +1190847573 767701596 554806188 +2870696950 1975607604 173919437 +1980384731 2612856575 87361977 +3380570559 2987564153 335753130 +3044616387 2451131599 21188806 +3909556885 2167390152 154541252 +3811077140 2149527041 17863111 +4077167815 3804196813 90739918 +2528751611 4222771775 72195521 +4064098137 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+769712435 3470643462 60345476 +2881033329 3042301427 24908217 +1480224835 2459841972 6279483 +99163750 257857701 63880419 +1060795937 1463902630 11997149 +830057911 3067209644 147678249 +1254184202 1194301285 19606964 +1486504318 1775591971 115009557 \ No newline at end of file diff --git a/inputs/05a.txt b/inputs/05a.txt new file mode 100644 index 0000000..ab13d99 --- /dev/null +++ b/inputs/05a.txt @@ -0,0 +1,33 @@ +seeds: 79 14 55 13 + +seed-to-soil map: +50 98 2 +52 50 48 + +soil-to-fertilizer map: +0 15 37 +37 52 2 +39 0 15 + +fertilizer-to-water map: +49 53 8 +0 11 42 +42 0 7 +57 7 4 + +water-to-light map: +88 18 7 +18 25 70 + +light-to-temperature map: +45 77 23 +81 45 19 +68 64 13 + +temperature-to-humidity map: +0 69 1 +1 0 69 + +humidity-to-location map: +60 56 37 +56 93 4 \ No newline at end of file diff --git a/src/05.cs b/src/05.cs new file mode 100644 index 0000000..f4fb617 --- /dev/null +++ b/src/05.cs @@ -0,0 +1,136 @@ +namespace aoc2023; + +internal class Day05 : Day +{ + record map(long destStart, long sourceStart, long len) + { + public long Translate(long input) + { + if (input >= sourceStart && input < sourceStart + len) + { + var offset = input - sourceStart; + return destStart + offset; + } + + return input; + } + + public long ReverseTranslate(long input) + { + if (input >= destStart && input < destStart + len) + { + var offset = input - destStart; + return sourceStart + offset; + } + + return input; + } + } + + private long TranslateInMapSet(List set, long input) + { + foreach (var m in set) + { + var translated = m.Translate(input); + if (translated != input) + { + return translated; + } + } + + return input; + } + + private long ReverseTranslateInMapSet(List set, long input) + { + foreach (var m in set) + { + var translated = m.ReverseTranslate(input); + if (translated != input) + { + return translated; + } + } + + return input; + } + + private List seeds = new(); + private List> maps = new(); + internal override void Parse() + { + var lines = Util.Parsing.ReadAllLines($"{GetDay()}"); + int mapNum = -1; + foreach (var line in lines) + { + if (seeds.Count == 0) + { + var split = line.Split(": "); + seeds.AddRange(split[1].Split(' ').Select(long.Parse)); + continue; + } + if (string.IsNullOrWhiteSpace(line)) + { + mapNum++; + continue; + } + + if (line.Contains(':')) + { + maps.Add(new()); + continue; + } + + var nums = line.Split(' ').Select(long.Parse).ToArray(); + maps[mapNum].Add(new(nums[0], nums[1], nums[2])); + } + } + + internal override string Part1() + { + long lowest = long.MaxValue; + foreach (var seed in seeds) + { + long curr = seed; + foreach (var set in maps) + { + curr = TranslateInMapSet(set, curr); + } + + if (curr < lowest) + { + lowest = curr; + } + } + + return $"Lowest location number: <+white>{lowest}"; + } + + internal override string Part2() + { + List<(long start, long len)> seedranges = new(); + for (int i = 0; i < seeds.Count; i += 2) + { + seedranges.Add((seeds[i], seeds[i+1])); + } + + for (long i = 0; i < long.MaxValue; i++) + { + long pos = i; + for (int j = maps.Count - 1; j >= 0; j--) + { + pos = ReverseTranslateInMapSet(maps[j], pos); + } + + foreach (var range in seedranges) + { + if (pos >= range.start && pos < range.start + range.len) + { + return $"Lowest location number in seed ranges is at seed {pos}: <+white>{i}"; + } + } + } + + throw new Exception("didn't find it..."); + } +}