day 18, part 1

main
Inga 🏳‍🌈 12 months ago
parent 37bf60ef8c
commit e2836d4266
  1. 70
      day18-easy/build.zig
  2. 722
      day18-easy/easy.in
  3. 14
      day18-easy/sample.in
  4. 196
      day18-easy/src/main.zig

@ -0,0 +1,70 @@
const std = @import("std");
// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) void {
// Standard target options allows the person running `zig build` to choose
// what target to build for. Here we do not override the defaults, which
// means any target is allowed, and the default is native. Other options
// for restricting supported target set are available.
const target = b.standardTargetOptions(.{});
// Standard optimization options allow the person running `zig build` to select
// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
// set a preferred release mode, allowing the user to decide how to optimize.
const optimize = b.standardOptimizeOption(.{});
const exe = b.addExecutable(.{
.name = "day18-easy",
// In this case the main source file is merely a path, however, in more
// complicated build scripts, this could be a generated file.
.root_source_file = .{ .path = "src/main.zig" },
.target = target,
.optimize = optimize,
});
// This declares intent for the executable to be installed into the
// standard location when the user invokes the "install" step (the default
// step when running `zig build`).
b.installArtifact(exe);
// This *creates* a Run step in the build graph, to be executed when another
// step is evaluated that depends on it. The next line below will establish
// such a dependency.
const run_cmd = b.addRunArtifact(exe);
// By making the run step depend on the install step, it will be run from the
// installation directory rather than directly from within the cache directory.
// This is not necessary, however, if the application depends on other installed
// files, this ensures they will be present and in the expected location.
run_cmd.step.dependOn(b.getInstallStep());
// This allows the user to pass arguments to the application in the build
// command itself, like this: `zig build run -- arg1 arg2 etc`
if (b.args) |args| {
run_cmd.addArgs(args);
}
// This creates a build step. It will be visible in the `zig build --help` menu,
// and can be selected like this: `zig build run`
// This will evaluate the `run` step rather than the default, which is "install".
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
// Creates a step for unit testing. This only builds the test executable
// but does not run it.
const unit_tests = b.addTest(.{
.root_source_file = .{ .path = "src/main.zig" },
.target = target,
.optimize = optimize,
});
const run_unit_tests = b.addRunArtifact(unit_tests);
// Similar to creating the run step earlier, this exposes a `test` step to
// the `zig build --help` menu, providing a way for the user to request
// running the unit tests.
const test_step = b.step("test", "Run unit tests");
test_step.dependOn(&run_unit_tests.step);
}

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U 7 (#7a8373)
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U 4 (#13a8d3)

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R 6 (#70c710)
D 5 (#0dc571)
L 2 (#5713f0)
D 2 (#d2c081)
R 2 (#59c680)
D 2 (#411b91)
L 5 (#8ceee2)
U 2 (#caa173)
L 1 (#1b58a2)
U 2 (#caa171)
R 2 (#7807d2)
U 3 (#a77fa3)
L 2 (#015232)
U 2 (#7a21e3)

@ -0,0 +1,196 @@
const std = @import("std");
fn RingQueueWrapper(comptime T: type, comptime size: usize) type {
return struct {
const Self = @This();
mem: *[size]T,
first: usize,
next: usize,
fn add(self: *Self, value: T) void {
std.debug.assert(self.next - self.first < size);
self.mem.*[self.next % size] = value;
self.next += 1;
}
fn take(self: *Self) T {
const result = self.mem.*[self.first % size];
self.first += 1;
return result;
}
fn isEmpty(self: *const Self) bool {
return self.next == self.first;
}
fn init(mem: *[size]T) Self {
return Self{
.mem = mem,
.first = 0,
.next = 0,
};
}
};
}
fn readNumber(comptime T: type, line: []const u8, index: *usize) T {
var result: T = 0;
while (index.* < line.len and line[index.*] == ' ') : (index.* += 1) {}
var is_negative = false;
if (index.* < line.len and line[index.*] == '-') {
is_negative = true;
index.* += 1;
}
std.debug.assert(index.* < line.len);
while (index.* < line.len) : (index.* += 1) {
const char = line[index.*];
switch (char) {
'0'...'9' => {
result = result * 10 + (char - '0');
},
else => {
break;
},
}
}
return if (is_negative) (0 - result) else result;
}
fn GenericTerrain(comptime CoordinateType: type, comptime height: CoordinateType, comptime width: CoordinateType, comptime CellType: type) type {
return struct {
const Self = @This();
x: CoordinateType,
y: CoordinateType,
cells: [height][width]CellType,
fn initZeroes() Self {
return .{ .x = height / 2, .y = width / 2, .cells = std.mem.zeroes([height][width]CellType) };
}
};
}
const CellStatus = enum(u2) {
Default = 0,
NotDug = 1,
Dug = 2,
};
const TerrainCoordinate = u16;
const Terrain = GenericTerrain(TerrainCoordinate, 1024, 1024, CellStatus);
const FloodTask = struct {
x: TerrainCoordinate,
y: TerrainCoordinate,
};
fn floodTerrain(terrain: *Terrain) void {
var queue_mem: [65_536]FloodTask = undefined;
var tasks = RingQueueWrapper(FloodTask, queue_mem.len).init(&queue_mem);
tasks.add(.{ .x = 0, .y = 0 });
while (!tasks.isEmpty()) {
const task = tasks.take();
const x = task.x;
const y = task.y;
//std.debug.print("Processing task for {d},{d} (current status: {any})\n", .{ x, y, terrain.*.cells[x][y] });
if (terrain.*.cells[x][y] == .Default) {
terrain.*.cells[x][y] = .NotDug;
//std.debug.print("Marked {d},{d} as NotDug\n", .{ x, y });
if (x > 0) {
tasks.add(.{ .x = x - 1, .y = y });
}
if (x + 1 < terrain.*.cells.len) {
tasks.add(.{ .x = x + 1, .y = y });
}
if (y > 0) {
tasks.add(.{ .x = x, .y = y - 1 });
}
if (y + 1 < terrain.*.cells[x].len) {
tasks.add(.{ .x = x, .y = y + 1 });
}
}
}
}
fn solveForTerrain(terrain: *Terrain) usize {
floodTerrain(terrain);
const cells = terrain.*.cells;
var result: usize = 0;
for (0..cells.len) |x| {
for (0..cells.len) |y| {
if (cells[x][y] != .NotDug) {
result += 1;
}
}
}
return result;
}
fn dig(terrain: *Terrain, command: []const u8) void {
var index: usize = 2;
const length = readNumber(usize, command, &index);
const direction = command[0];
for (0..length) |i| {
_ = i;
terrain.*.x = switch (direction) {
'R' => terrain.*.x + 1,
'L' => terrain.*.x - 1,
else => terrain.*.x,
};
terrain.*.y = switch (direction) {
'D' => terrain.*.y + 1,
'U' => terrain.*.y - 1,
else => terrain.*.y,
};
//std.debug.print("digging {d},{d}\n", .{ terrain.*.x, terrain.*.y });
terrain.*.cells[terrain.*.x][terrain.*.y] = .Dug;
}
}
fn solveAll(reader: anytype) !usize {
var result: usize = 0;
while (true) {
var terrain = Terrain.initZeroes();
var empty_line_reached = false;
var line_buffer: [1000]u8 = undefined;
while (try reader.readUntilDelimiterOrEof(&line_buffer, '\n')) |line| {
if (line.len == 0) {
empty_line_reached = true;
break;
}
dig(&terrain, line);
}
result += solveForTerrain(&terrain);
if (!empty_line_reached) {
return result;
}
}
}
pub fn main() !void {
const stdout = std.io.getStdOut().writer();
const raw_in = std.io.getStdIn();
var buffered_reader = std.io.bufferedReader(raw_in.reader());
var reader = buffered_reader.reader();
const result = try solveAll(&reader);
try stdout.print("{d}\n", .{result});
}
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