diff --git a/day11-easy/build.zig b/day11-easy/build.zig new file mode 100644 index 0000000..98a8649 --- /dev/null +++ b/day11-easy/build.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 = "day11-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); +} diff --git a/day11-easy/easy.in b/day11-easy/easy.in new file mode 100644 index 0000000..89486df --- /dev/null +++ b/day11-easy/easy.in @@ -0,0 +1,140 @@ +............................................#.........#.......#.................#.......#........#.......................................... +......................................#.........................................................................#.........................#. 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+.......#.. +#...#..... \ No newline at end of file diff --git a/day11-easy/src/main.zig b/day11-easy/src/main.zig new file mode 100644 index 0000000..e1d93d7 --- /dev/null +++ b/day11-easy/src/main.zig @@ -0,0 +1,93 @@ +const std = @import("std"); + +const Char = enum(u2) { + Galaxy, + Empty, +}; + +fn solve(projections: [2][]const u32) u32 { + var result: u32 = 0; + + for (projections) |projection| { + var i: usize = 0; + while (i < projection.len) : (i += 1) { + if (projection[i] == 0) { + continue; + } + + var distance: u32 = 0; + var j = i + 1; + while (j < projection.len) : (j += 1) { + if (projection[j] == 0) { + distance += 2; + } else { + distance += 1; + result += projection[i] * projection[j] * distance; + } + } + } + } + + return result; +} + +fn charLinesToProjections(allocator: std.mem.Allocator, char_lines: [][]const Char) ![2][]const u32 { + var rows = try allocator.alloc(u32, char_lines.len); + var columns = try allocator.alloc(u32, char_lines[0].len); + @memset(rows, 0); + @memset(columns, 0); + for (char_lines, 0..) |char_line, i| { + for (char_line, 0..) |char, j| { + if (char == .Galaxy) { + rows[i] += 1; + columns[j] += 1; + } + } + } + + return .{ rows, columns }; +} + +fn readInput(allocator: std.mem.Allocator, reader: anytype) ![][]const Char { + var lines = std.ArrayList([]Char).init(allocator); + var line_buffer: [1000]u8 = undefined; + while (try reader.readUntilDelimiterOrEof(&line_buffer, '\n')) |line_ref| { + var line = try allocator.alloc(Char, line_ref.len); + for (line_ref, line) |raw_char, *char| { + char.* = switch (raw_char) { + '#' => .Galaxy, + '.' => .Empty, + else => unreachable, + }; + } + try lines.append(line); + } + + return lines.items; +} + +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(); + + var allocator_buffer: [1_000_000]u8 = undefined; + var fba = std.heap.FixedBufferAllocator.init(&allocator_buffer); + var allocator = fba.allocator(); + + var lines_arena = std.heap.ArenaAllocator.init(allocator); + const lines_allocator = lines_arena.allocator(); + const char_lines = try readInput(lines_allocator, reader); + + var projections_arena = std.heap.ArenaAllocator.init(allocator); + const projections_allocator = projections_arena.allocator(); + const projections = try charLinesToProjections(projections_allocator, char_lines); + lines_arena.deinit(); + + const result = solve(projections); + projections_arena.deinit(); + + try stdout.print("{d}\n", .{result}); +}