src/days/day09.zig

@@ -1,93 +1,7 @@
 const std = @import("std");
 
-pub const title = "Day 09: Movie Theater";
+pub const title = "Day 09";
 
-pub fn run(allocator: std.mem.Allocator) !void {
+pub fn run(_: std.mem.Allocator) !void {
-    const input = @embedFile("./input/day09.txt");
-    //const input =
-    //    \\7,1
-    //    \\11,1
-    //    \\11,7
-    //    \\9,7
-    //    \\9,5
-    //    \\2,5
-    //    \\2,3
-    //    \\7,3
-    //    ;
-
-    var lines = std.mem.tokenizeScalar(u8, input, '\n');
-
-    var tiles: std.ArrayList(Tile) = .empty;
-    defer tiles.deinit(allocator);
-
-    while (lines.next()) |line| {
-        var coordinates = std.mem.tokenizeScalar(u8, line, ',');
-        const x = blk: {
-            const s = coordinates.next() orelse continue;
-            break :blk try std.fmt.parseUnsigned(u64, s, 10);
-        };
-        const y = blk: {
-            const s = coordinates.next() orelse continue;
-            break :blk try std.fmt.parseUnsigned(u64, s, 10);
-        };
-        try tiles.append(allocator, .{ .pos = .{ x, y } });
-    }
-
-    var largest_area: usize = 0;
-    var largest_rectangle: Rectangle = undefined;
-    for (tiles.items, 0..) |first_tile, i| {
-        for (tiles.items[i + 1..]) |second_tile| {
-            const rectangle = first_tile.rectangle(second_tile);
-            const area = rectangle.area();
-            if (area > largest_area) {
-                largest_area = area;
-                largest_rectangle = rectangle;
-            }
-        }
-    }
-
-    std.debug.print("rectangle = {f}\n", .{largest_rectangle});
-
-    var buffer: [64]u8 = undefined;
-    var stdout_writer = std.fs.File.stdout().writer(&buffer);
-    const stdout = &stdout_writer.interface;
-
-    try stdout.print("{d}\n", .{largest_area});
-
-    try stdout.flush();
 }
 
-const Tile = struct {
-    pos: @Vector(2, u64),
-
-    const Self = @This();
-
-    pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void {
-        try w.print("{d},{d}", .{self.pos[0], self.pos[1]});
-    }
-
-    pub fn rectangle(self: Self, other_corner: Self) Rectangle {
-        return .{ .a = self, .b = other_corner };
-    }
-};
-
-const Rectangle = struct {
-    a: Tile,
-    b: Tile,
-
-    const Self = @This();
-
-    pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void {
-        try w.print("{f} to {f}", .{self.a, self.b});
-    }
-
-    pub fn area(self: Self) u64 {
-        const cond = self.a.pos > self.b.pos;
-        const high = @select(u64, cond, self.a.pos, self.b.pos);
-        const low = @select(u64, !cond, self.a.pos, self.b.pos);
-        const diff = high - low;
-        const one: @Vector(2, u64) = @splat(1);
-        return @reduce(.Mul, diff + one);
-    }
-};
-

src/days/input/day09.txt

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