2022-14 in zig

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
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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;
+}