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day 14, part 1 (forgot to commit)

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Inga 🏳‍🌈 5 months ago
parent dcb1bd10e7
commit ccd4ac9a7c
4 changed files with 308 additions and 0 deletions
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  1. 70
      day14-easy/build.zig
  2. 100
      day14-easy/easy.in
  3. 10
      day14-easy/sample.in
  4. 128
      day14-easy/src/main.zig

70
day14-easy/build.zig
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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 = "day14-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);
}

100
day14-easy/easy.in
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10
day14-easy/sample.in
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O....#....
O.OO#....#
.....##...
OO.#O....O
.O.....O#.
O.#..O.#.#
..O..#O..O
.......O..
#....###..
#OO..#....

128
day14-easy/src/main.zig
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const std = @import("std");
fn StackList(comptime T: type, comptime capacity_type: type, comptime capacity: capacity_type) type {
return struct {
const Self = @This();
mem: [capacity]T,
length: capacity_type,
fn add(self: *Self, value: T) void {
self.mem[self.length] = value;
self.length += 1;
}
fn has(self: *Self, needle: T) bool {
for (0..self.length) |i| {
if (self.mem[i] == needle) {
return true;
}
}
return false;
}
fn getMutableSlice(self: *Self) []T {
return (&self.mem)[0..self.length];
}
fn getSlice(self: *const Self) []const T {
return self.mem[0..self.length];
}
fn init() Self {
return Self{
.mem = undefined,
.length = 0,
};
}
};
}
fn tilt(lines: [][]u8) void {
var column: usize = 0;
while (column < lines[0].len) : (column += 1) {
var row: usize = 0;
var first_empty_row: usize = std.math.maxInt(usize);
while (row < lines.len) : (row += 1) {
switch (lines[row][column]) {
'#' => {
first_empty_row = std.math.maxInt(usize);
},
'.' => {
if (first_empty_row > row) {
first_empty_row = row;
}
},
'O' => {
if (first_empty_row < row) {
lines[first_empty_row][column] = 'O';
lines[row][column] = '.';
first_empty_row += 1;
}
},
else => unreachable,
}
}
}
}
fn solveLines(lines: [][]u8) usize {
tilt(lines);
var result: usize = 0;
var row: usize = 0;
while (row < lines.len) : (row += 1) {
const weight = lines.len - row;
const line = lines[row];
var column: usize = 0;
while (column < line.len) : (column += 1) {
switch (line[column]) {
'#' => {},
'.' => {},
'O' => {
result += weight;
},
else => unreachable,
}
}
}
return result;
}
pub fn solveAll(reader: anytype) !usize {
var result: usize = 0;
while (true) {
var allocator_buffer: [10000]u8 = undefined;
var fba = std.heap.FixedBufferAllocator.init(&allocator_buffer);
var allocator = fba.allocator();
var lines = StackList([]u8, usize, 100).init();
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;
}
lines.add(try allocator.dupe(u8, line));
}
result += solveLines(lines.getMutableSlice());
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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