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-rw-r--r--2022/14-regolith-reservoir/example2
-rw-r--r--2022/14-regolith-reservoir/first.zig194
-rw-r--r--2022/14-regolith-reservoir/input168
-rw-r--r--2022/14-regolith-reservoir/second.zig200
4 files changed, 564 insertions, 0 deletions
diff --git a/2022/14-regolith-reservoir/example b/2022/14-regolith-reservoir/example
new file mode 100644
index 0000000..4e87bb5
--- /dev/null
+++ b/2022/14-regolith-reservoir/example
@@ -0,0 +1,2 @@
+498,4 -> 498,6 -> 496,6
+503,4 -> 502,4 -> 502,9 -> 494,9
diff --git a/2022/14-regolith-reservoir/first.zig b/2022/14-regolith-reservoir/first.zig
new file mode 100644
index 0000000..d85ca23
--- /dev/null
+++ b/2022/14-regolith-reservoir/first.zig
@@ -0,0 +1,194 @@
+const std = @import("std");
+
+const example = @embedFile("example");
+const input = @embedFile("input");
+
+var allocator: std.mem.Allocator = undefined;
+
+pub fn main() anyerror!void {
+ var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+ defer arena.deinit();
+ allocator = arena.allocator();
+
+ try std.testing.expectEqual(try solve(example), 24);
+ const result = try solve(input);
+ try std.io.getStdOut().writer().print("{}\n", .{result});
+}
+
+const Line = struct {
+ data: std.ArrayList(u8),
+ x: u64,
+ fn get(l: *Line, x: u64) u8 {
+ if (x >= l.x and x < l.x + @intCast(u64, l.len())) return l.data.items[@intCast(usize, x - @intCast(u64, l.x))];
+ return ' ';
+ }
+ fn init() !*Line {
+ var l = try allocator.create(Line);
+ l.data = std.ArrayList(u8).init(allocator);
+ return l;
+ }
+ inline fn len(l: Line) usize {
+ return l.data.items.len;
+ }
+ fn set(l: *Line, x: u64, v: u8) !void {
+ if (l.len() == 0) { // this is en empty line
+ l.x = x;
+ try l.data.append(v);
+ return;
+ }
+ const lx = @intCast(u64, l.len());
+ if (x >= l.x) {
+ if (x < l.x + lx) { // just set the value
+ l.data.items[@intCast(usize, x - l.x)] = v;
+ } else { // we need to add trailing spaces
+ var i: usize = l.len();
+ while (i < x - l.x) : (i += 1) {
+ try l.data.append(' ');
+ }
+ try l.data.append(v);
+ }
+ } else { // we need to shift right and add leading spaces
+ const oldLen = l.len();
+ l.data.items.len += @intCast(usize, l.x - x);
+ try l.data.ensureUnusedCapacity(l.len());
+ std.mem.copyBackwards(u8, l.data.items[@intCast(usize, l.x - x)..], l.data.items[0..oldLen]);
+ l.data.items[0] = v;
+ var i: usize = 1;
+ while (i < @intCast(usize, l.x - x)) : (i += 1) {
+ l.data.items[i] = ' ';
+ }
+ l.x = x;
+ }
+ }
+};
+
+pub const Field = struct {
+ x: u64 = 0,
+ y: u64 = 0,
+ lines: std.ArrayList(*Line),
+ lx: usize = 0,
+ pub fn get(f: *Field, x: u64, y: u64) u8 {
+ if (y >= f.y and y < f.y + @intCast(u64, f.lines.items.len)) return f.lines.items[@intCast(usize, y - @intCast(u64, f.y))].get(x);
+ return ' ';
+ }
+ fn init() !*Field {
+ var f = try allocator.create(Field);
+ f.x = undefined;
+ f.y = 0;
+ f.lines = std.ArrayList(*Line).init(allocator);
+ var l = try f.lines.addOne();
+ l.* = try Line.init();
+ f.lx = 0;
+ return f;
+ }
+ inline fn isIn(f: *Field, x: u64, y: u64) bool {
+ return x >= f.x and y >= f.y and x < f.x + @intCast(u64, f.lx) and y < f.y + @intCast(u64, f.lines.items.len);
+ }
+ inline fn len(f: Field) usize {
+ return f.lines.items.len;
+ }
+ pub fn set(f: *Field, x: u64, y: u64, v: u8) !void {
+ if (y >= f.y) {
+ if (y < f.y + @intCast(u64, f.lines.items.len)) { // the line exists
+ try f.lines.items[@intCast(usize, y - f.y)].set(x, v);
+ } else { // append lines
+ var i: usize = f.lines.items.len;
+ while (i < y - f.y) : (i += 1) {
+ try f.lines.append(try Line.init());
+ }
+ var l = try Line.init();
+ try l.set(x, v);
+ try f.lines.append(l);
+ }
+ } else { // preprend lines
+ const oldLen = f.lines.items.len;
+ f.lines.items.len += @intCast(usize, f.y - y);
+ try f.lines.ensureUnusedCapacity(f.lines.items.len);
+ std.mem.copyBackwards(*Line, f.lines.items[@intCast(usize, f.y - y)..], f.lines.items[0..oldLen]);
+ var l = try Line.init();
+ try l.set(x, v);
+ f.lines.items[0] = l;
+ var i: usize = 1;
+ while (i < @intCast(usize, f.y - y)) : (i += 1) {
+ f.lines.items[i] = try Line.init();
+ }
+ f.y = y;
+ }
+ if (x < f.x or x >= f.x + @intCast(u64, f.lx)) { // recalculate boundaries
+ f.x = std.math.maxInt(u64);
+ var x2: u64 = std.math.minInt(u64);
+ for (f.lines.items) |line| {
+ if (line.len() == 0) continue;
+ if (f.x > line.x) f.x = line.x;
+ if (x2 < line.x + @intCast(u64, line.len())) x2 = line.x + @intCast(u64, line.len());
+ }
+ f.lx = @intCast(usize, x2 - f.x);
+ }
+ return;
+ }
+};
+
+fn solve(puzzle: []const u8) !u64 {
+ var it = std.mem.tokenize(u8, puzzle, "\n");
+ var field = try Field.init();
+ // process input
+ while (it.next()) |line| {
+ var coords = std.mem.tokenize(u8, line, " ->,");
+ var x = try std.fmt.parseInt(u64, coords.next() orelse continue, 10);
+ var y = try std.fmt.parseInt(u64, coords.next() orelse unreachable, 10);
+ try field.set(x, y, '#');
+ while (true) {
+ var a = try std.fmt.parseInt(u64, coords.next() orelse break, 10);
+ var b = try std.fmt.parseInt(u64, coords.next() orelse unreachable, 10);
+
+ while (x != a or y != b) {
+ if (x < a) {
+ x += 1;
+ } else if (x > a) {
+ x -= 1;
+ }
+ if (y < b) {
+ y += 1;
+ } else if (y > b) {
+ y -= 1;
+ }
+ try field.set(x, y, '#');
+ }
+ }
+ }
+ // run simulation
+ var i: usize = 0;
+ outer: while (true) : (i += 1) { // add sand forever
+ var x: u64 = 500;
+ var y: u64 = field.y;
+ while (true) { // let the sand fall
+ if (!field.isIn(x, y)) {
+ break :outer;
+ }
+ switch (field.get(x, y + 1)) {
+ ' ' => y += 1, // we can fall straight down
+ else => {
+ switch (field.get(x - 1, y + 1)) {
+ ' ' => { // we can fall down to the left
+ x -= 1;
+ y += 1;
+ },
+ else => {
+ switch (field.get(x + 1, y + 1)) {
+ ' ' => { // we can fall down to the right
+ x += 1;
+ y += 1;
+ },
+ else => { // we stop falling
+ try field.set(x, y, 'o');
+ break;
+ },
+ }
+ },
+ }
+ },
+ }
+ }
+ }
+ return i;
+}
diff --git a/2022/14-regolith-reservoir/input b/2022/14-regolith-reservoir/input
new file mode 100644
index 0000000..246be59
--- /dev/null
+++ b/2022/14-regolith-reservoir/input
@@ -0,0 +1,168 @@
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+490,15 -> 501,15 -> 501,14
+503,68 -> 508,68
+513,60 -> 513,61 -> 523,61 -> 523,60
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+524,136 -> 529,136
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+513,66 -> 518,66
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+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
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+528,139 -> 528,141 -> 521,141 -> 521,146 -> 534,146 -> 534,141 -> 531,141 -> 531,139
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diff --git a/2022/14-regolith-reservoir/second.zig b/2022/14-regolith-reservoir/second.zig
new file mode 100644
index 0000000..cfc408d
--- /dev/null
+++ b/2022/14-regolith-reservoir/second.zig
@@ -0,0 +1,200 @@
+const std = @import("std");
+
+const example = @embedFile("example");
+const input = @embedFile("input");
+
+var allocator: std.mem.Allocator = undefined;
+
+pub fn main() anyerror!void {
+ var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+ defer arena.deinit();
+ allocator = arena.allocator();
+
+ try std.testing.expectEqual(try solve(example), 93);
+ const result = try solve(input);
+ try std.io.getStdOut().writer().print("{}\n", .{result});
+}
+
+const Line = struct {
+ data: std.ArrayList(u8),
+ x: u64,
+ fn get(l: *Line, x: u64) u8 {
+ if (x >= l.x and x < l.x + @intCast(u64, l.len())) return l.data.items[@intCast(usize, x - @intCast(u64, l.x))];
+ return ' ';
+ }
+ fn init() !*Line {
+ var l = try allocator.create(Line);
+ l.data = std.ArrayList(u8).init(allocator);
+ return l;
+ }
+ inline fn len(l: Line) usize {
+ return l.data.items.len;
+ }
+ fn set(l: *Line, x: u64, v: u8) !void {
+ if (l.len() == 0) { // this is en empty line
+ l.x = x;
+ try l.data.append(v);
+ return;
+ }
+ const lx = @intCast(u64, l.len());
+ if (x >= l.x) {
+ if (x < l.x + lx) { // just set the value
+ l.data.items[@intCast(usize, x - l.x)] = v;
+ } else { // we need to add trailing spaces
+ var i: usize = l.len();
+ while (i < x - l.x) : (i += 1) {
+ try l.data.append(' ');
+ }
+ try l.data.append(v);
+ }
+ } else { // we need to shift right and add leading spaces
+ const oldLen = l.len();
+ l.data.items.len += @intCast(usize, l.x - x);
+ try l.data.ensureUnusedCapacity(l.len());
+ std.mem.copyBackwards(u8, l.data.items[@intCast(usize, l.x - x)..], l.data.items[0..oldLen]);
+ l.data.items[0] = v;
+ var i: usize = 1;
+ while (i < @intCast(usize, l.x - x)) : (i += 1) {
+ l.data.items[i] = ' ';
+ }
+ l.x = x;
+ }
+ }
+};
+
+pub const Field = struct {
+ x: u64 = 0,
+ y: u64 = 0,
+ lines: std.ArrayList(*Line),
+ lx: usize = 0,
+ pub fn get(f: *Field, x: u64, y: u64) u8 {
+ if (y >= f.y and y < f.y + @intCast(u64, f.lines.items.len)) return f.lines.items[@intCast(usize, y - @intCast(u64, f.y))].get(x);
+ return ' ';
+ }
+ fn init() !*Field {
+ var f = try allocator.create(Field);
+ f.x = undefined;
+ f.y = 0;
+ f.lines = std.ArrayList(*Line).init(allocator);
+ var l = try f.lines.addOne();
+ l.* = try Line.init();
+ f.lx = 0;
+ return f;
+ }
+ inline fn isIn(f: *Field, x: u64, y: u64) bool {
+ return x >= f.x and y >= f.y and x < f.x + @intCast(u64, f.lx) and y < f.y + @intCast(u64, f.lines.items.len);
+ }
+ inline fn len(f: Field) usize {
+ return f.lines.items.len;
+ }
+ pub fn set(f: *Field, x: u64, y: u64, v: u8) !void {
+ if (y >= f.y) {
+ if (y < f.y + @intCast(u64, f.lines.items.len)) { // the line exists
+ try f.lines.items[@intCast(usize, y - f.y)].set(x, v);
+ } else { // append lines
+ var i: usize = f.lines.items.len;
+ while (i < y - f.y) : (i += 1) {
+ try f.lines.append(try Line.init());
+ }
+ var l = try Line.init();
+ try l.set(x, v);
+ try f.lines.append(l);
+ }
+ } else { // preprend lines
+ const oldLen = f.lines.items.len;
+ f.lines.items.len += @intCast(usize, f.y - y);
+ try f.lines.ensureUnusedCapacity(f.lines.items.len);
+ std.mem.copyBackwards(*Line, f.lines.items[@intCast(usize, f.y - y)..], f.lines.items[0..oldLen]);
+ var l = try Line.init();
+ try l.set(x, v);
+ f.lines.items[0] = l;
+ var i: usize = 1;
+ while (i < @intCast(usize, f.y - y)) : (i += 1) {
+ f.lines.items[i] = try Line.init();
+ }
+ f.y = y;
+ }
+ if (x < f.x or x >= f.x + @intCast(u64, f.lx)) { // recalculate boundaries
+ f.x = std.math.maxInt(u64);
+ var x2: u64 = std.math.minInt(u64);
+ for (f.lines.items) |line| {
+ if (line.len() == 0) continue;
+ if (f.x > line.x) f.x = line.x;
+ if (x2 < line.x + @intCast(u64, line.len())) x2 = line.x + @intCast(u64, line.len());
+ }
+ f.lx = @intCast(usize, x2 - f.x);
+ }
+ return;
+ }
+};
+
+fn solve(puzzle: []const u8) !u64 {
+ var it = std.mem.tokenize(u8, puzzle, "\n");
+ var field = try Field.init();
+ // process input
+ while (it.next()) |line| {
+ var coords = std.mem.tokenize(u8, line, " ->,");
+ var x = try std.fmt.parseInt(u64, coords.next() orelse continue, 10);
+ var y = try std.fmt.parseInt(u64, coords.next() orelse unreachable, 10);
+ try field.set(x, y, '#');
+ while (true) {
+ var a = try std.fmt.parseInt(u64, coords.next() orelse break, 10);
+ var b = try std.fmt.parseInt(u64, coords.next() orelse unreachable, 10);
+
+ while (x != a or y != b) {
+ if (x < a) {
+ x += 1;
+ } else if (x > a) {
+ x -= 1;
+ }
+ if (y < b) {
+ y += 1;
+ } else if (y > b) {
+ y -= 1;
+ }
+ try field.set(x, y, '#');
+ }
+ }
+ }
+ // run simulation
+ const maxY = field.y + field.len();
+ var i: usize = 0;
+ while (true) : (i += 1) { // add sand forever
+ var x: u64 = 500;
+ var y: u64 = field.y;
+ while (true) { // let the sand fall
+ if (y == maxY) {
+ try field.set(x - 1, y + 1, '#');
+ try field.set(x, y + 1, '#');
+ try field.set(x + 1, y + 1, '#');
+ }
+ switch (field.get(x, y + 1)) {
+ ' ' => y += 1, // we can fall straight down
+ else => {
+ switch (field.get(x - 1, y + 1)) {
+ ' ' => { // we can fall down to the left
+ x -= 1;
+ y += 1;
+ },
+ else => {
+ switch (field.get(x + 1, y + 1)) {
+ ' ' => { // we can fall down to the right
+ x += 1;
+ y += 1;
+ },
+ else => { // we stop falling
+ try field.set(x, y, 'o');
+ break;
+ },
+ }
+ },
+ }
+ },
+ }
+ }
+ if (x == 500 and y == 0) {
+ break;
+ }
+ }
+ return i + 1;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 03:11:40 +0000