Terribly inefficient. But hey, it works!

1 year ago · 5ba7e6e4e1
parent 080ff61267
commit 5ba7e6e4e1
3 changed files with 421 additions and 0 deletions
--- a/day5/data.txt
+++ b/day5/data.txt
@ -0,0 +1,247 @@
+seeds: 487758422 524336848 2531594804 27107767 1343486056 124327551 1117929819 93097070 3305050822 442320425 2324984130 87604424 4216329536 45038934 1482842780 224610898 115202033 371332058 2845474954 192579859
+
+seed-to-soil map:
+152560994 173671324 63296280
+22185606 1527272669 123700133
+1331635416 297391996 25501160
+2532562923 236967604 60424392
+145885739 854580877 6675255
+696074404 427174664 330582271
+0 1407203152 22185606
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+2679050525 3516671293 482421092
+1227353908 322893156 104281508
+1077860077 757756935 96823942
+3161471617 3999092385 22763615
+1509447184 1650972802 82059456
+4170512486 2802241718 1263617
+1196044735 1495963496 31309173
+1357136576 0 152310608
+4171776103 2679050525 123191193
+1731875772 1733032258 319590386
+282432012 1001625264 405577888
+215857274 1429388758 66574738
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+1591506640 861256132 140369132
+688009900 2052622644 8064504
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+3184235232 4021856000 273111296
+2051466158 2060687148 481096765
+
+soil-to-fertilizer map:
+2587123207 1612631011 14556918
+425896400 1627187929 180219453
+974395525 3228073255 181091940
+606115853 2482605187 15274968
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+2918057000 0 181557220
+2638230336 908305704 279826664
+
+fertilizer-to-water map:
+0 226390191 111676682
+342717440 10141562 176981703
+3507713259 629378619 187481170
+3695194429 3739990160 60489319
+2747106431 4155961766 11528550
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+519699143 0 10141562
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+2758634981 2739092076 17282641
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+
+water-to-light map:
+1222332482 2306154207 322881400
+3721269109 3329751112 30895612
+4157109606 3191893422 137857690
+2602036554 3676681423 255279159
+2293973174 3078247260 113646162
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+3973340148 2006872236 24436917
+3814114845 2629035607 159225303
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+3752164721 2244648686 1709624
+2857315713 3939596774 261056192
+3997777065 3360646724 159332541
+2556520415 2260638068 45516139
+2407619336 4200652966 94314330
+1545213882 2788260910 289986350
+
+light-to-temperature map:
+40645637 589707204 89929230
+2331703372 3634092968 247989827
+375013050 880330876 388603146
+959059361 861524497 18806379
+3081535248 2703807387 671456921
+2080450790 1678532701 100545991
+1520717011 1522300302 156232399
+3801827392 4285326304 9640992
+2834731556 1990942492 115059472
+2949791028 2566169187 71005535
+3020796563 4224587619 60738685
+4159346802 1855321998 135620494
+977865740 0 297257755
+3811468384 3375264308 157802817
+2304295289 1779078692 27408083
+3752992169 1806486775 48835223
+2579693199 3882082795 255038357
+130574867 328095764 236983298
+4081903724 3533067125 77443078
+367558165 310812857 7454885
+3969271201 3610510203 23582765
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+0 1268934022 6189473
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+763616196 297257755 13555102
+6189473 565079062 24628142
+2237662624 2637174722 66632665
+
+temperature-to-humidity map:
+3854764317 3086190444 332386294
+2110554705 1096342109 65650849
+3236082645 1211923153 20175736
+846106827 1853452836 60731419
+596073066 1972015961 100470927
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+89279871 1232098889 41001293
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+87114400 3859612892 2165471
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+696543993 3861778363 11572713
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+2752290281 4279665593 15301703
+3022761194 913764510 182577599
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+3725162656 710593286 129601661
+708116706 1623944190 7429782
+3205338793 3630065089 30743852
+294416701 2927841838 158348606
+
+humidity-to-location map:
+3745579304 2724582328 81388084
+2201043082 981698567 150857305
+456470998 689872919 41258774
+2351900387 2312761976 47825019
+497729772 314502888 115122928
+4036836228 4279991461 14975835
+784121118 3255986437 5687937
+612852700 0 118278993
+3894168411 842107405 27168107
+3127730376 4061803810 218187651
+1230572305 1958697503 125808488
+304425981 163566931 106757079
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+3885438708 972968864 8729703
+0 270324010 44178878
+4095868912 2360586995 99297853
+4033131940 2084505991 3704288
--- a/day5/main.zig
+++ b/day5/main.zig
@ -0,0 +1,141 @@
+const std = @import("std");
+
+const Range = struct { destination: u64, source: u64, length: u64 };
+const Map = struct { from: []const u8, to: []const u8, ranges: std.ArrayList(Range) };
+
+pub fn main() !void {
+    const content = @embedFile("data.txt");
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+
+    // split the file content on empty lines
+    var sections = std.mem.split(u8, content, "\n\n");
+
+    // parse out the first line, collecting seeds into an ArrayList
+    var seedSection = std.mem.split(u8, sections.next().?, " ");
+    var seeds = std.ArrayList(u64).init(allocator);
+    defer seeds.deinit();
+    _ = seedSection.next();
+    while (seedSection.next()) |s| {
+        try seeds.append(try std.fmt.parseInt(u64, s, 10));
+    }
+
+    var maps = std.ArrayList(Map).init(allocator);
+    defer maps.deinit();
+
+    // iterate over each section, parse into Map structs, append them onto the maps ArrayList
+    while (sections.next()) |s| {
+        var lines = std.mem.split(u8, s, "\n");
+        var firstLine = lines.next().?;
+        var words = std.mem.split(u8, firstLine, " ");
+        // grab the first "word" of the first line, and split it on -
+        var parts = std.mem.split(u8, words.next().?, "-");
+        const from = parts.next().?;
+        _ = parts.next();
+        const to = parts.next().?;
+
+        var ranges = std.ArrayList(Range).init(allocator);
+        // TODO: do I need to deinit ranges... somewhere?
+        while (lines.next()) |line| {
+            if (line.len == 0) {
+                continue;
+            }
+            var nums = std.mem.split(u8, line, " ");
+            var destination = try std.fmt.parseInt(u64, nums.next().?, 10);
+            var source = try std.fmt.parseInt(u64, nums.next().?, 10);
+            var length = try std.fmt.parseInt(u64, nums.next().?, 10);
+            const range = Range{ .destination = destination, .source = source, .length = length };
+            try ranges.append(range);
+        }
+        const map = Map{ .from = from, .to = to, .ranges = ranges };
+        try maps.append(map);
+    }
+
+    var lowestLocation: ?u64 = null;
+    for (seeds.items) |seed| {
+        // loop starting from the "seed" map until we have a location
+        var from: []const u8 = "seed";
+        var val = seed;
+
+        while (!std.mem.eql(u8, from, "location")) {
+            const map = findMap(from, maps).?;
+            val = findNewValue(val, map);
+            from = map.to;
+        }
+        if (lowestLocation) |l| {
+            if (val < l) {
+                lowestLocation = val;
+            }
+        } else {
+            lowestLocation = val;
+        }
+    }
+
+    std.debug.print("Part 1 {?d}\n", .{lowestLocation});
+
+    // Part 2
+    // Can we go backwards?
+    var i: u64 = 0;
+    outer: while (true) {
+        var to: []const u8 = "location";
+        var val = i;
+
+        while (!std.mem.eql(u8, to, "seed")) {
+            const map = findMapReverse(to, maps).?;
+            val = findNewValueReverse(val, map);
+            to = map.from;
+        }
+
+        var idx: u8 = 0;
+        while (idx < seeds.items.len) : (idx += 2) {
+            const lower = seeds.items[idx];
+            const upper = lower + seeds.items[idx + 1];
+            if (val >= lower and val < upper) {
+                break :outer;
+            }
+        }
+        i += 1;
+    }
+
+    std.debug.print("Part 2 {?d}\n", .{i});
+}
+
+// given the "from" type, find the map that we should follow
+fn findMap(from: []const u8, maps: std.ArrayList(Map)) ?Map {
+    for (maps.items) |map| {
+        if (std.mem.eql(u8, map.from, from)) {
+            return map;
+        }
+    }
+    return null;
+}
+
+fn findNewValue(val: u64, map: Map) u64 {
+    for (map.ranges.items) |r| {
+        if (val >= r.source and val < r.source + r.length) {
+            return r.destination + val - r.source;
+        }
+    }
+    // if no range fits, return the original value
+    return val;
+}
+
+// given the "to" type, find the map that we should follow
+fn findMapReverse(to: []const u8, maps: std.ArrayList(Map)) ?Map {
+    for (maps.items) |map| {
+        if (std.mem.eql(u8, map.to, to)) {
+            return map;
+        }
+    }
+    return null;
+}
+
+fn findNewValueReverse(val: u64, map: Map) u64 {
+    for (map.ranges.items) |r| {
+        if (val >= r.destination and val < r.destination + r.length) {
+            return r.source + val - r.destination;
+        }
+    }
+    // if no range fits, return the original value
+    return val;
+}
--- a/day5/test.txt
+++ b/day5/test.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