From e8378d440f8d3eb10e6836d6c2084a744f0cb265 Mon Sep 17 00:00:00 2001 From: Inga Date: Sat, 2 Dec 2023 13:44:04 +0000 Subject: [PATCH] day2, part 2 --- day02-hard/build.zig | 70 +++++++++++++++++++++++++++++ day02-hard/sample.in | 5 +++ day02-hard/src/main.zig | 97 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 172 insertions(+) create mode 100644 day02-hard/build.zig create mode 100644 day02-hard/sample.in create mode 100644 day02-hard/src/main.zig diff --git a/day02-hard/build.zig b/day02-hard/build.zig new file mode 100644 index 0000000..19c52f9 --- /dev/null +++ b/day02-hard/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 = "day02-hard", + // 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/day02-hard/sample.in b/day02-hard/sample.in new file mode 100644 index 0000000..1cd7d33 --- /dev/null +++ b/day02-hard/sample.in @@ -0,0 +1,5 @@ +Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green +Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue +Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red +Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red +Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green \ No newline at end of file diff --git a/day02-hard/src/main.zig b/day02-hard/src/main.zig new file mode 100644 index 0000000..7e4eca3 --- /dev/null +++ b/day02-hard/src/main.zig @@ -0,0 +1,97 @@ +const std = @import("std"); + +const Cubes = struct { + red: u32 = 0, + green: u32 = 0, + blue: u32 = 0, + + fn getPower(self: *Cubes) u32 { + return self.red * self.green * self.blue; + } + + fn setRed(self: *Cubes, value: u32) void { + if (self.red < value) { + self.red = value; + } + } + + fn setGreen(self: *Cubes, value: u32) void { + if (self.green < value) { + self.green = value; + } + } + + fn setBlue(self: *Cubes, value: u32) void { + if (self.blue < value) { + self.blue = value; + } + } +}; + +fn solve(line: []const u8) u32 { + var current_number: u32 = 0; + var current_pick = Cubes{}; + + var index: usize = 0; + while (index < line.len) : (index += 1) { + const char = line[index]; + switch (char) { + '0'...'9' => { + current_number = current_number * 10 + (char - '0'); + }, + 'G' => { + index += 4; + }, + ':' => { + current_number = 0; + }, + ' ' => {}, + ',' => {}, + 'r' => { + current_pick.setRed(current_number); + current_number = 0; + index += 2; + }, + 'g' => { + current_pick.setGreen(current_number); + current_number = 0; + index += 4; + }, + 'b' => { + current_pick.setBlue(current_number); + current_number = 0; + index += 3; + }, + ';' => {}, + else => unreachable, + } + } + + return current_pick.getPower(); +} + +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 result: u32 = 0; + var line_buffer: [1000]u8 = undefined; + while (try reader.readUntilDelimiterOrEof(&line_buffer, '\n')) |line| { + result += solve(line); + } + try stdout.print( + "{d}\n", + .{result}, + ); +} + +test "solve" { + try std.testing.expectEqual(@as(?u32, 48), solve("Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green")); + try std.testing.expectEqual(@as(?u32, 12), solve("Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue")); + try std.testing.expectEqual(@as(?u32, 1560), solve("Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red")); + try std.testing.expectEqual(@as(?u32, 630), solve("Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red")); + try std.testing.expectEqual(@as(?u32, 36), solve("Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green")); +}