commit e7e3e07496345c518de3883933f1c74d3af5836c Author: Hamcha Date: Sat Dec 7 23:30:39 2024 +0100 day 1 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..79f1c74 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +/.zig* +/ex/ diff --git a/build.zig b/build.zig new file mode 100644 index 0000000..ee4c2bc --- /dev/null +++ b/build.zig @@ -0,0 +1,91 @@ +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 lib = b.addStaticLibrary(.{ + .name = "aoc15", + // 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 = b.path("src/root.zig"), + .target = target, + .optimize = optimize, + }); + + // This declares intent for the library to be installed into the standard + // location when the user invokes the "install" step (the default step when + // running `zig build`). + b.installArtifact(lib); + + const exe = b.addExecutable(.{ + .name = "aoc15", + .root_source_file = b.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 lib_unit_tests = b.addTest(.{ + .root_source_file = b.path("src/root.zig"), + .target = target, + .optimize = optimize, + }); + + const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests); + + const exe_unit_tests = b.addTest(.{ + .root_source_file = b.path("src/main.zig"), + .target = target, + .optimize = optimize, + }); + + const run_exe_unit_tests = b.addRunArtifact(exe_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_lib_unit_tests.step); + test_step.dependOn(&run_exe_unit_tests.step); +} diff --git a/build.zig.zon b/build.zig.zon new file mode 100644 index 0000000..65280cf --- /dev/null +++ b/build.zig.zon @@ -0,0 +1,72 @@ +.{ + // This is the default name used by packages depending on this one. For + // example, when a user runs `zig fetch --save `, this field is used + // as the key in the `dependencies` table. Although the user can choose a + // different name, most users will stick with this provided value. + // + // It is redundant to include "zig" in this name because it is already + // within the Zig package namespace. + .name = "aoc15", + + // This is a [Semantic Version](https://semver.org/). + // In a future version of Zig it will be used for package deduplication. + .version = "0.0.0", + + // This field is optional. + // This is currently advisory only; Zig does not yet do anything + // with this value. + //.minimum_zig_version = "0.11.0", + + // This field is optional. + // Each dependency must either provide a `url` and `hash`, or a `path`. + // `zig build --fetch` can be used to fetch all dependencies of a package, recursively. + // Once all dependencies are fetched, `zig build` no longer requires + // internet connectivity. + .dependencies = .{ + // See `zig fetch --save ` for a command-line interface for adding dependencies. + //.example = .{ + // // When updating this field to a new URL, be sure to delete the corresponding + // // `hash`, otherwise you are communicating that you expect to find the old hash at + // // the new URL. + // .url = "https://example.com/foo.tar.gz", + // + // // This is computed from the file contents of the directory of files that is + // // obtained after fetching `url` and applying the inclusion rules given by + // // `paths`. + // // + // // This field is the source of truth; packages do not come from a `url`; they + // // come from a `hash`. `url` is just one of many possible mirrors for how to + // // obtain a package matching this `hash`. + // // + // // Uses the [multihash](https://multiformats.io/multihash/) format. + // .hash = "...", + // + // // When this is provided, the package is found in a directory relative to the + // // build root. In this case the package's hash is irrelevant and therefore not + // // computed. This field and `url` are mutually exclusive. + // .path = "foo", + + // // When this is set to `true`, a package is declared to be lazily + // // fetched. This makes the dependency only get fetched if it is + // // actually used. + // .lazy = false, + //}, + }, + + // Specifies the set of files and directories that are included in this package. + // Only files and directories listed here are included in the `hash` that + // is computed for this package. Only files listed here will remain on disk + // when using the zig package manager. As a rule of thumb, one should list + // files required for compilation plus any license(s). + // Paths are relative to the build root. Use the empty string (`""`) to refer to + // the build root itself. + // A directory listed here means that all files within, recursively, are included. + .paths = .{ + "build.zig", + "build.zig.zon", + "src", + // For example... + //"LICENSE", + //"README.md", + }, +} diff --git a/src/day1_p1.zig b/src/day1_p1.zig new file mode 100644 index 0000000..80dafae --- /dev/null +++ b/src/day1_p1.zig @@ -0,0 +1,40 @@ +const std = @import("std"); + +pub fn main() !void { + const stdin = std.io.getStdIn(); + var buf_io = std.io.bufferedReader(stdin.reader()); + var reader = buf_io.reader(); + + var buf = [_]u8{0} ** 100000; + _ = try reader.readAll(&buf); + + std.debug.print("{}", .{calculate_floor(&buf)}); +} + +fn calculate_floor(instructions: []const u8) i32 { + var current: i32 = 0; + + for (instructions) |c| { + switch (c) { + 0 => break, + '(' => current += 1, + ')' => current -= 1, + else => continue, + } + std.debug.print("{}\n", .{current}); + } + + return current; +} + +test "day-tests" { + try std.testing.expectEqual(calculate_floor("((("), 3); + try std.testing.expectEqual(calculate_floor("(())"), 0); + try std.testing.expectEqual(calculate_floor("()()"), 0); + try std.testing.expectEqual(calculate_floor("(()(()("), 3); + try std.testing.expectEqual(calculate_floor("))((((("), 3); + try std.testing.expectEqual(calculate_floor("())"), -1); + try std.testing.expectEqual(calculate_floor("))("), -1); + try std.testing.expectEqual(calculate_floor(")))"), -3); + try std.testing.expectEqual(calculate_floor(")())())"), -3); +} diff --git a/src/day1_p2.zig b/src/day1_p2.zig new file mode 100644 index 0000000..d16d192 --- /dev/null +++ b/src/day1_p2.zig @@ -0,0 +1,37 @@ +const std = @import("std"); + +pub fn main() !void { + const stdin = std.io.getStdIn(); + var buf_io = std.io.bufferedReader(stdin.reader()); + var reader = buf_io.reader(); + + var buf = [_]u8{0} ** 100000; + _ = try reader.readAll(&buf); + + std.debug.print("{}", .{calculate_floor(&buf)}); +} + +fn calculate_floor(instructions: []const u8) i32 { + var current: i32 = 0; + var i: i32 = 1; + + for (instructions) |c| { + switch (c) { + 0 => break, + '(' => current += 1, + ')' => current -= 1, + else => continue, + } + if (current < 0) { + return i; + } + i += 1; + } + + return -1; +} + +test "day-tests" { + try std.testing.expectEqual(calculate_floor(")"), 1); + try std.testing.expectEqual(calculate_floor("()())"), 5); +}