From faf1d82e4b52e43bfc351b29ceec1904e43b601f Mon Sep 17 00:00:00 2001 From: Inga Date: Tue, 5 Dec 2023 17:22:50 +0000 Subject: [PATCH] tmp --- day05-easy/build.zig | 70 ++++++++++++++++ day05-easy/sample.in | 33 ++++++++ day05-easy/src/main.zig | 181 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 284 insertions(+) create mode 100644 day05-easy/build.zig create mode 100644 day05-easy/sample.in create mode 100644 day05-easy/src/main.zig diff --git a/day05-easy/build.zig b/day05-easy/build.zig new file mode 100644 index 0000000..6272626 --- /dev/null +++ b/day05-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 = "day05-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/day05-easy/sample.in b/day05-easy/sample.in new file mode 100644 index 0000000..bd902a4 --- /dev/null +++ b/day05-easy/sample.in @@ -0,0 +1,33 @@ +seeds: 79 14 55 13 + +seed-to-soil map: +50 98 2 +52 50 48 + +soil-to-fertilizer map: +0 15 37 +37 52 2 +39 0 15 + +fertilizer-to-water map: +49 53 8 +0 11 42 +42 0 7 +57 7 4 + +water-to-light map: +88 18 7 +18 25 70 + +light-to-temperature map: +45 77 23 +81 45 19 +68 64 13 + +temperature-to-humidity map: +0 69 1 +1 0 69 + +humidity-to-location map: +60 56 37 +56 93 4 \ No newline at end of file diff --git a/day05-easy/src/main.zig b/day05-easy/src/main.zig new file mode 100644 index 0000000..9ab3185 --- /dev/null +++ b/day05-easy/src/main.zig @@ -0,0 +1,181 @@ +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: *const Self, needle: T) bool { + for (0..self.length) |i| { + if (self.mem[i] == needle) { + return true; + } + } + + return false; + } + + fn getSlice(self: *const Self) []const T { + return self.mem[0..self.length]; + } + + fn reset(self: *Self) void { + self.length = 0; + } + + fn init() Self { + return Self{ + .mem = undefined, + .length = 0, + }; + } + }; +} + +const StateStorage = StackList(u64, u32, 10_000); + +const State = struct { + a: StateStorage = StateStorage.init(), + b: StateStorage = StateStorage.init(), + is_a_current: bool = true, + + fn getCurrent(self: *State) *StateStorage { + return switch (self.is_a_current) { + true => &self.a, + false => &self.b, + }; + } + + fn getPrevious(self: *State) *StateStorage { + return switch (self.is_a_current) { + true => &self.b, + false => &self.a, + }; + } + + fn add(self: *State, value: u64) void { + self.getCurrent().*.add(value); + } + + fn addMapping(self: *State, destination_start: u64, source_start: u64, range_length: u64) void { + var current = self.getCurrent(); + const previous = self.getPrevious().*; + const source_end = source_start + range_length; + std.debug.print("processing mapping from {d}-{d} (length {d}) to {d}\n", .{ source_start, source_end, range_length, destination_start }); + for (previous.getSlice()) |value| { + if (value >= source_start and value < source_end) { + const new_value = (value - source_start) + destination_start; + std.debug.print("adding new value {d}\n", .{new_value}); + current.*.add(new_value); + } + } + } + + fn swap(self: *State) void { + self.is_a_current = !self.is_a_current; + self.getCurrent().*.reset(); + } + + fn getMinCurrentValue(self: *State) u64 { + var current = self.getCurrent().*; + var result: u32 = std.math.maxInt(u32); + for (current.getSlice()) |value| { + result = @min(result, value); + } + + return result; + } + + fn debug(self: *State) void { + std.debug.print("Current state: {any}, previous state: {any}\n", .{ self.getCurrent().*.getSlice(), self.getPrevious().*.getSlice() }); + } +}; + +fn addDigit(result: anytype, digit: u8) void { + result.* = (result.* * 10) + (digit - '0'); +} + +fn parseFirstLine(line: []const u8) State { + var result = State{}; + var current_number: u64 = 0; + + var index: usize = 0; + while (index < line.len) : (index += 1) { + const char = line[index]; + switch (char) { + '0'...'9' => { + addDigit(¤t_number, char); + }, + else => { + if (current_number != 0) { + result.add(current_number); + current_number = 0; + } + }, + } + } + + if (current_number != 0) { + result.add(current_number); + } + + return result; +} + +fn parseMappingLine(line: []const u8, state: *State) void { + var destination_start: u64 = 0; + var source_start: u64 = 0; + var range_length: u64 = 0; + + var index: usize = 0; + while (line[index] != ' ') : (index += 1) { + addDigit(&destination_start, line[index]); + } + + index += 1; + while (line[index] != ' ') : (index += 1) { + addDigit(&source_start, line[index]); + } + + index += 1; + while (index < line.len) : (index += 1) { + addDigit(&range_length, line[index]); + } + + state.addMapping(destination_start, source_start, range_length); +} + +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 line_buffer: [1000]u8 = undefined; + const first_line = (try reader.readUntilDelimiterOrEof(&line_buffer, '\n')).?; + var state = parseFirstLine(first_line); + state.debug(); + _ = try reader.readUntilDelimiterOrEof(&line_buffer, '\n'); + _ = try reader.readUntilDelimiterOrEof(&line_buffer, '\n'); + state.swap(); + state.debug(); + while (try reader.readUntilDelimiterOrEof(&line_buffer, '\n')) |line| { + if (line.len != 0) { + parseMappingLine(line, &state); + } else { + state.debug(); + _ = try reader.readUntilDelimiterOrEof(&line_buffer, '\n'); + state.swap(); + } + } + + state.debug(); + try stdout.print("{d}\n", .{state.getMinCurrentValue()}); +}