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Vectors!

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ktkk 2025-12-09 09:24:55 +00:00
parent d1e798bdbf
commit 1d6cdccaf8
1 changed files with 9 additions and 7 deletions
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16
src/days/day09.zig
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@ -30,7 +30,7 @@ pub fn run(allocator: std.mem.Allocator) !void {
const s = coordinates.next() orelse continue; const s = coordinates.next() orelse continue;
break :blk try std.fmt.parseUnsigned(u64, s, 10); break :blk try std.fmt.parseUnsigned(u64, s, 10);
}; };
try tiles.append(allocator, .{ .x = x, .y = y }); try tiles.append(allocator, .{ .pos = .{ x, y } });
} }
var largest_area: usize = 0; var largest_area: usize = 0;
@ -58,13 +58,12 @@ pub fn run(allocator: std.mem.Allocator) !void {
} }
const Tile = struct { const Tile = struct {
x: u64, pos: @Vector(2, u64),
y: u64,
const Self = @This(); const Self = @This();
pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void { pub fn format(self: Self, w: *std.io.Writer) std.io.Writer.Error!void {
try w.print("{d},{d}", .{self.x, self.y}); try w.print("{d},{d}", .{self.pos[0], self.pos[1]});
} }
pub fn rectangle(self: Self, other_corner: Self) Rectangle { pub fn rectangle(self: Self, other_corner: Self) Rectangle {
@ -83,9 +82,12 @@ const Rectangle = struct {
} }
pub fn area(self: Self) u64 { pub fn area(self: Self) u64 {
const width = @max(self.a.x, self.b.x) - @min(self.a.x, self.b.x) + 1; const cond = self.a.pos > self.b.pos;
const height = @max(self.a.y, self.b.y) - @min(self.a.y, self.b.y) + 1; const high = @select(u64, cond, self.a.pos, self.b.pos);
return width * height; 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);
} }
}; };