From 23bad094965de7d9ed27f91e84d42fbc9576476d Mon Sep 17 00:00:00 2001 From: Inga Date: Sat, 2 Dec 2023 13:34:56 +0000 Subject: [PATCH] day2, part 1 --- day02-easy/build.zig | 70 +++++++++++++++++++++++++++ day02-easy/sample.in | 5 ++ day02-easy/src/main.zig | 103 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 178 insertions(+) create mode 100644 day02-easy/build.zig create mode 100644 day02-easy/sample.in create mode 100644 day02-easy/src/main.zig diff --git a/day02-easy/build.zig b/day02-easy/build.zig new file mode 100644 index 0000000..bc47184 --- /dev/null +++ b/day02-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 = "day02-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/day02-easy/sample.in b/day02-easy/sample.in new file mode 100644 index 0000000..1cd7d33 --- /dev/null +++ b/day02-easy/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-easy/src/main.zig b/day02-easy/src/main.zig new file mode 100644 index 0000000..9d8d24c --- /dev/null +++ b/day02-easy/src/main.zig @@ -0,0 +1,103 @@ +const std = @import("std"); + +const Cubes = struct { + red: u32 = 0, + green: u32 = 0, + blue: u32 = 0, + fn isCompatibleWith(self: *Cubes, bag: Cubes) bool { + //std.debug.print("bag: r{d}g{d}b{d}, current: r{d}g{d}b{d}\n", .{ bag.red, bag.green, bag.blue, self.red, self.green, self.blue }); + return self.red <= bag.red and self.green <= bag.green and self.blue <= bag.blue; + } +}; + +fn solve(line: []const u8, bag: Cubes) u32 { + //std.debug.print("\n", .{}); + var is_compatible = true; + var game_number: u32 = 0; + var current_number: u32 = 0; + var current_pick = Cubes{}; + + var index: usize = 0; + while (index < line.len) : (index += 1) { + const char = line[index]; + //std.debug.print("char: {s}\n", .{[_]u8{char}}); + switch (char) { + '0'...'9' => { + current_number = current_number * 10 + (char - '0'); + }, + 'G' => { + index += 4; + }, + ':' => { + game_number = current_number; + current_number = 0; + }, + ' ' => {}, + ',' => {}, + 'r' => { + current_pick.red = current_number; + current_number = 0; + index += 2; + }, + 'g' => { + current_pick.green = current_number; + current_number = 0; + index += 4; + }, + 'b' => { + current_pick.blue = current_number; + current_number = 0; + index += 3; + }, + ';' => { + is_compatible = is_compatible and current_pick.isCompatibleWith(bag); + current_pick = Cubes{}; + }, + else => unreachable, + } + } + + is_compatible = is_compatible and current_pick.isCompatibleWith(bag); + return if (is_compatible) game_number else 0; +} + +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 bag = Cubes{ + .red = 12, + .green = 13, + .blue = 14, + }; + + var result: u32 = 0; + var line_buffer: [1000]u8 = undefined; + while (try reader.readUntilDelimiterOrEof(&line_buffer, '\n')) |line| { + result += solve(line, bag); + } + try stdout.print( + "{d}\n", + .{result}, + ); +} + +test "solve" { + const bag = Cubes{ + .red = 12, + .green = 23, + .blue = 31, + }; + try std.testing.expectEqual(@as(?u32, 76), solve("Game 76: 11 red, 22 green, 30 blue", bag)); + try std.testing.expectEqual(@as(?u32, 76), solve("Game 76: 12 red, 23 green, 31 blue", bag)); + try std.testing.expectEqual(@as(?u32, 0), solve("Game 76: 13 red, 23 green, 31 blue", bag)); + try std.testing.expectEqual(@as(?u32, 0), solve("Game 76: 12 red, 24 green, 31 blue", bag)); + try std.testing.expectEqual(@as(?u32, 0), solve("Game 76: 12 red, 23 green, 32 blue", bag)); + try std.testing.expectEqual(@as(?u32, 0), solve("Game 76: 13 red, 24 green, 32 blue", bag)); + try std.testing.expectEqual(@as(?u32, 76), solve("Game 76: 12 red, 23 green, 31 blue; 12 red, 23 green, 31 blue", bag)); + try std.testing.expectEqual(@as(?u32, 0), solve("Game 76: 13 red, 23 green, 31 blue; 12 red, 23 green, 31 blue", bag)); + try std.testing.expectEqual(@as(?u32, 0), solve("Game 76: 12 red, 23 green, 31 blue; 12 red, 23 green, 32 blue", bag)); +}