day14

3 files changed, 339 insertions, 0 deletions

diff --git a/day14 b/day14
new file mode 100644
index 0000000..246be59
--- /dev/null
+++ b/day14
@@ -0,0 +1,168 @@
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+503,37 -> 503,31 -> 503,37 -> 505,37 -> 505,29 -> 505,37 -> 507,37 -> 507,29 -> 507,37 -> 509,37 -> 509,29 -> 509,37 -> 511,37 -> 511,32 -> 511,37 -> 513,37 -> 513,29 -> 513,37 -> 515,37 -> 515,34 -> 515,37 -> 517,37 -> 517,36 -> 517,37 -> 519,37 -> 519,36 -> 519,37
+521,71 -> 521,73 -> 514,73 -> 514,79 -> 527,79 -> 527,73 -> 525,73 -> 525,71
+521,71 -> 521,73 -> 514,73 -> 514,79 -> 527,79 -> 527,73 -> 525,73 -> 525,71
+513,60 -> 513,61 -> 523,61 -> 523,60
+503,37 -> 503,31 -> 503,37 -> 505,37 -> 505,29 -> 505,37 -> 507,37 -> 507,29 -> 507,37 -> 509,37 -> 509,29 -> 509,37 -> 511,37 -> 511,32 -> 511,37 -> 513,37 -> 513,29 -> 513,37 -> 515,37 -> 515,34 -> 515,37 -> 517,37 -> 517,36 -> 517,37 -> 519,37 -> 519,36 -> 519,37
+537,130 -> 542,130
+520,96 -> 520,92 -> 520,96 -> 522,96 -> 522,86 -> 522,96 -> 524,96 -> 524,92 -> 524,96 -> 526,96 -> 526,93 -> 526,96 -> 528,96 -> 528,95 -> 528,96 -> 530,96 -> 530,88 -> 530,96 -> 532,96 -> 532,88 -> 532,96 -> 534,96 -> 534,91 -> 534,96 -> 536,96 -> 536,92 -> 536,96 -> 538,96 -> 538,88 -> 538,96
+508,49 -> 508,52 -> 504,52 -> 504,55 -> 516,55 -> 516,52 -> 514,52 -> 514,49
+545,136 -> 550,136
+538,136 -> 543,136
+520,96 -> 520,92 -> 520,96 -> 522,96 -> 522,86 -> 522,96 -> 524,96 -> 524,92 -> 524,96 -> 526,96 -> 526,93 -> 526,96 -> 528,96 -> 528,95 -> 528,96 -> 530,96 -> 530,88 -> 530,96 -> 532,96 -> 532,88 -> 532,96 -> 534,96 -> 534,91 -> 534,96 -> 536,96 -> 536,92 -> 536,96 -> 538,96 -> 538,88 -> 538,96
+532,109 -> 532,103 -> 532,109 -> 534,109 -> 534,106 -> 534,109 -> 536,109 -> 536,102 -> 536,109 -> 538,109 -> 538,107 -> 538,109 -> 540,109 -> 540,107 -> 540,109 -> 542,109 -> 542,100 -> 542,109 -> 544,109 -> 544,106 -> 544,109
+528,139 -> 528,141 -> 521,141 -> 521,146 -> 534,146 -> 534,141 -> 531,141 -> 531,139
+503,37 -> 503,31 -> 503,37 -> 505,37 -> 505,29 -> 505,37 -> 507,37 -> 507,29 -> 507,37 -> 509,37 -> 509,29 -> 509,37 -> 511,37 -> 511,32 -> 511,37 -> 513,37 -> 513,29 -> 513,37 -> 515,37 -> 515,34 -> 515,37 -> 517,37 -> 517,36 -> 517,37 -> 519,37 -> 519,36 -> 519,37
+532,109 -> 532,103 -> 532,109 -> 534,109 -> 534,106 -> 534,109 -> 536,109 -> 536,102 -> 536,109 -> 538,109 -> 538,107 -> 538,109 -> 540,109 -> 540,107 -> 540,109 -> 542,109 -> 542,100 -> 542,109 -> 544,109 -> 544,106 -> 544,109
+508,49 -> 508,52 -> 504,52 -> 504,55 -> 516,55 -> 516,52 -> 514,52 -> 514,49
+532,109 -> 532,103 -> 532,109 -> 534,109 -> 534,106 -> 534,109 -> 536,109 -> 536,102 -> 536,109 -> 538,109 -> 538,107 -> 538,109 -> 540,109 -> 540,107 -> 540,109 -> 542,109 -> 542,100 -> 542,109 -> 544,109 -> 544,106 -> 544,109
+503,37 -> 503,31 -> 503,37 -> 505,37 -> 505,29 -> 505,37 -> 507,37 -> 507,29 -> 507,37 -> 509,37 -> 509,29 -> 509,37 -> 511,37 -> 511,32 -> 511,37 -> 513,37 -> 513,29 -> 513,37 -> 515,37 -> 515,34 -> 515,37 -> 517,37 -> 517,36 -> 517,37 -> 519,37 -> 519,36 -> 519,37
+529,159 -> 529,153 -> 529,159 -> 531,159 -> 531,151 -> 531,159 -> 533,159 -> 533,156 -> 533,159 -> 535,159 -> 535,152 -> 535,159 -> 537,159 -> 537,154 -> 537,159 -> 539,159 -> 539,156 -> 539,159
+510,68 -> 515,68
+520,96 -> 520,92 -> 520,96 -> 522,96 -> 522,86 -> 522,96 -> 524,96 -> 524,92 -> 524,96 -> 526,96 -> 526,93 -> 526,96 -> 528,96 -> 528,95 -> 528,96 -> 530,96 -> 530,88 -> 530,96 -> 532,96 -> 532,88 -> 532,96 -> 534,96 -> 534,91 -> 534,96 -> 536,96 -> 536,92 -> 536,96 -> 538,96 -> 538,88 -> 538,96
+550,118 -> 555,118
+520,96 -> 520,92 -> 520,96 -> 522,96 -> 522,86 -> 522,96 -> 524,96 -> 524,92 -> 524,96 -> 526,96 -> 526,93 -> 526,96 -> 528,96 -> 528,95 -> 528,96 -> 530,96 -> 530,88 -> 530,96 -> 532,96 -> 532,88 -> 532,96 -> 534,96 -> 534,91 -> 534,96 -> 536,96 -> 536,92 -> 536,96 -> 538,96 -> 538,88 -> 538,96
+528,139 -> 528,141 -> 521,141 -> 521,146 -> 534,146 -> 534,141 -> 531,141 -> 531,139
+529,159 -> 529,153 -> 529,159 -> 531,159 -> 531,151 -> 531,159 -> 533,159 -> 533,156 -> 533,159 -> 535,159 -> 535,152 -> 535,159 -> 537,159 -> 537,154 -> 537,159 -> 539,159 -> 539,156 -> 539,159
+532,109 -> 532,103 -> 532,109 -> 534,109 -> 534,106 -> 534,109 -> 536,109 -> 536,102 -> 536,109 -> 538,109 -> 538,107 -> 538,109 -> 540,109 -> 540,107 -> 540,109 -> 542,109 -> 542,100 -> 542,109 -> 544,109 -> 544,106 -> 544,109
+529,159 -> 529,153 -> 529,159 -> 531,159 -> 531,151 -> 531,159 -> 533,159 -> 533,156 -> 533,159 -> 535,159 -> 535,152 -> 535,159 -> 537,159 -> 537,154 -> 537,159 -> 539,159 -> 539,156 -> 539,159
+521,71 -> 521,73 -> 514,73 -> 514,79 -> 527,79 -> 527,73 -> 525,73 -> 525,71
+541,133 -> 546,133
+529,159 -> 529,153 -> 529,159 -> 531,159 -> 531,151 -> 531,159 -> 533,159 -> 533,156 -> 533,159 -> 535,159 -> 535,152 -> 535,159 -> 537,159 -> 537,154 -> 537,159 -> 539,159 -> 539,156 -> 539,159
+520,96 -> 520,92 -> 520,96 -> 522,96 -> 522,86 -> 522,96 -> 524,96 -> 524,92 -> 524,96 -> 526,96 -> 526,93 -> 526,96 -> 528,96 -> 528,95 -> 528,96 -> 530,96 -> 530,88 -> 530,96 -> 532,96 -> 532,88 -> 532,96 -> 534,96 -> 534,91 -> 534,96 -> 536,96 -> 536,92 -> 536,96 -> 538,96 -> 538,88 -> 538,96
+513,60 -> 513,61 -> 523,61 -> 523,60
+518,40 -> 522,40
+517,68 -> 522,68
+500,18 -> 500,20 -> 496,20 -> 496,24 -> 511,24 -> 511,20 -> 504,20 -> 504,18
+520,96 -> 520,92 -> 520,96 -> 522,96 -> 522,86 -> 522,96 -> 524,96 -> 524,92 -> 524,96 -> 526,96 -> 526,93 -> 526,96 -> 528,96 -> 528,95 -> 528,96 -> 530,96 -> 530,88 -> 530,96 -> 532,96 -> 532,88 -> 532,96 -> 534,96 -> 534,91 -> 534,96 -> 536,96 -> 536,92 -> 536,96 -> 538,96 -> 538,88 -> 538,96
+520,96 -> 520,92 -> 520,96 -> 522,96 -> 522,86 -> 522,96 -> 524,96 -> 524,92 -> 524,96 -> 526,96 -> 526,93 -> 526,96 -> 528,96 -> 528,95 -> 528,96 -> 530,96 -> 530,88 -> 530,96 -> 532,96 -> 532,88 -> 532,96 -> 534,96 -> 534,91 -> 534,96 -> 536,96 -> 536,92 -> 536,96 -> 538,96 -> 538,88 -> 538,96
+529,159 -> 529,153 -> 529,159 -> 531,159 -> 531,151 -> 531,159 -> 533,159 -> 533,156 -> 533,159 -> 535,159 -> 535,152 -> 535,159 -> 537,159 -> 537,154 -> 537,159 -> 539,159 -> 539,156 -> 539,159
+520,96 -> 520,92 -> 520,96 -> 522,96 -> 522,86 -> 522,96 -> 524,96 -> 524,92 -> 524,96 -> 526,96 -> 526,93 -> 526,96 -> 528,96 -> 528,95 -> 528,96 -> 530,96 -> 530,88 -> 530,96 -> 532,96 -> 532,88 -> 532,96 -> 534,96 -> 534,91 -> 534,96 -> 536,96 -> 536,92 -> 536,96 -> 538,96 -> 538,88 -> 538,96
+520,96 -> 520,92 -> 520,96 -> 522,96 -> 522,86 -> 522,96 -> 524,96 -> 524,92 -> 524,96 -> 526,96 -> 526,93 -> 526,96 -> 528,96 -> 528,95 -> 528,96 -> 530,96 -> 530,88 -> 530,96 -> 532,96 -> 532,88 -> 532,96 -> 534,96 -> 534,91 -> 534,96 -> 536,96 -> 536,92 -> 536,96 -> 538,96 -> 538,88 -> 538,96
+529,159 -> 529,153 -> 529,159 -> 531,159 -> 531,151 -> 531,159 -> 533,159 -> 533,156 -> 533,159 -> 535,159 -> 535,152 -> 535,159 -> 537,159 -> 537,154 -> 537,159 -> 539,159 -> 539,156 -> 539,159
+535,161 -> 535,162 -> 544,162 -> 544,161
+551,124 -> 556,124
+500,18 -> 500,20 -> 496,20 -> 496,24 -> 511,24 -> 511,20 -> 504,20 -> 504,18
diff --git a/day14.rkt b/day14.rkt
new file mode 100644
index 0000000..2e5f32f
--- /dev/null
+++ b/day14.rkt
@@ -0,0 +1,63 @@
+#lang racket
+
+(define area (build-vector 800 (lambda _ (make-vector 800 0))))
+
+(define (area-get x y)
+  (vector-ref (vector-ref area y) x))
+
+(define (area-set! x y v)
+  (vector-set! (vector-ref area y) x v))
+
+(define/match (draw from to)
+  [((list x y1) (list x y2))
+   (for ([y (in-inclusive-range (min y1 y2) (max y1 y2))])
+     (area-set! x y 9))]
+  [((list x1 y) (list x2 y))
+   (for ([x (in-inclusive-range (min x1 x2) (max x1 x2))])
+     (area-set! x y 9))])
+
+(for ([line (file->lines "day14")])
+  (let ([coords (for/list ([coord (string-split line " -> ")])
+                  (map string->number (string-split coord ",")))])
+    (for ([from coords]
+          [to (cdr coords)])
+      (draw from to))))
+
+(define (drop-sand x y)
+  (if (or (>= y 799) (>= x 799))
+    #f
+    (case (area-get x (+ y 1))
+      [(0)   (drop-sand x (+ y 1))]
+      [(1 9) (case (area-get (- x 1) (+ y 1))
+               [(0)   (drop-sand (- x 1) (+ y 1))]
+               [(1 9) (case (area-get (+ x 1) (+ y 1))
+                        [(0)   (drop-sand (+ x 1) (+ y 1))]
+                        [(1 9) (area-set! x y 1)])])])))
+
+(let loop ([i 0])
+  (if (drop-sand 500 0)
+    (loop (+ 1 i))
+    i))
+;; 665
+
+;; clear sand
+(void
+ (vector-map! (lambda (line) (vector-map! (lambda (x) (if (= x 1) 0 x)) line)) area))
+
+(void 
+ (for/and ([i (in-inclusive-range 599 0 -1)])
+   (when (for/or ([item (vector-ref area i)])
+           (= item 9))
+     (draw (list 0 (+ i 2))
+           (list 799 (+ i 2)))
+     #f)))
+
+(let loop ([i 0])
+  (if (= (area-get 500 0) 1)
+    i
+    (begin
+      (drop-sand 500 0)
+      (loop (+ 1 i)))))
+;; 25434
+
+;; (for ([line area]) (displayln line))
diff --git a/day14.zig b/day14.zig
new file mode 100644
index 0000000..42f6b89
--- /dev/null
+++ b/day14.zig
@@ -0,0 +1,108 @@
+// needs -O ReleaseFast, else super slow
+
+const std = @import("std");
+const data = @embedFile("day14");
+
+var area = [_][800]u8{ [_]u8{0} ** 800 } ** 800;
+
+fn draw(ox: usize, oy: usize, x: usize, y: usize) void {
+    if (ox == x) {
+        var vy = std.math.min(oy, y);
+        while (vy <= std.math.max(oy, y)) : (vy += 1)
+            area[x][vy] = 9;
+    } else {
+        var vx = std.math.min(ox, x);
+        while (vx <= std.math.max(ox, x)) : (vx += 1)
+            area[vx][y] = 9;
+    }
+}
+
+fn drop_sand(y1: usize, x1: usize) bool {
+    var y = y1;
+    var x = x1;
+
+    while (x < 799 and y < 799) {
+        if (area[y+1][x] == 0) {
+            y += 1;
+            continue;
+        } 
+        if (area[y+1][x-1] == 0) {
+            x -= 1;
+            y += 1;
+            continue;
+        }
+        if (area[y+1][x+1] == 0) {
+            x += 1;
+            y += 1;
+            continue;
+        }
+        area[y][x] = 1;
+        return true;
+    }
+    
+    return false;
+}
+
+pub fn main() !void {
+    var lines = std.mem.tokenize(u8, data, "\n");
+
+    while (lines.next()) |line| {
+        if (line.len == 0)
+            break;
+
+        var coords = std.mem.tokenize(u8, line, " -> ");
+
+        var ox: usize = 0;
+        var oy: usize = 0;
+        while (coords.next()) |coord| {
+            var ns = std.mem.tokenize(u8, coord, ",");
+            var y = try std.fmt.parseInt(usize, ns.next().?, 10);
+            var x = try std.fmt.parseInt(usize, ns.next().?, 10);
+
+            if (ox != 0)
+                draw(ox, oy, x, y);
+
+            ox = x;
+            oy = y;
+        }
+    }
+
+
+    var part1: usize = 0;
+    while (drop_sand(0, 500))
+        part1 += 1;
+
+    for (area) |*line| {
+        for (line) |*item| {
+            if (item.* == 1)
+                item.* = 0;
+        }
+    }
+
+    var bottom: usize = 799;
+    loop: while (bottom > 0) : (bottom -= 1) {
+        for (area[bottom]) |item| {
+            if (item == 9) {
+                draw(bottom + 2, 0, bottom + 2, 799);
+                break :loop;
+            }
+        }
+    }
+    
+    var part2: usize = 0;
+    loop: while (drop_sand(0, 500)) {
+        part2 += 1;
+
+        if (area[0][500] != 0)
+            break :loop;
+    }
+
+//    for (area) |line| {
+//        for (line) |item| {
+//            std.debug.print("{}", .{item});
+//        }
+//        std.debug.print("\n", .{});
+//    }
+
+    std.debug.print("{}\n{}\n", .{part1, part2});
+}