Solve day 3

This commit is contained in:
Tyler Hallada 2022-12-03 01:51:24 -05:00
parent 2fbada26bf
commit 6c80df7b20
4 changed files with 385 additions and 0 deletions

76
src/day03.zig Normal file
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const std = @import("std");
pub const input = @embedFile("input/day03.txt");
const test_input = @embedFile("input/day03_test1.txt");
fn ascii_to_priority(char: u8) error{InvalidChar}!u8 {
if (char >= 97 and char <= 122) {
return char - 96;
} else if (char >= 65 and char <= 90) {
return char - 64 + 26;
} else {
return error.InvalidChar;
}
}
const PrioritySet = std.StaticBitSet(26 * 2 + 1);
pub fn solve_part1(data: []const u8) !usize {
var lines = std.mem.split(u8, data, "\n");
var sum: usize = 0;
while (lines.next()) |line| {
if (std.mem.eql(u8, line, "")) break;
var compartment1 = PrioritySet.initEmpty();
var compartment2 = PrioritySet.initEmpty();
var i: usize = 0;
while (i < line.len) : (i += 1) {
const priority = try ascii_to_priority(line[i]);
if (i < line.len / 2) {
compartment1.set(priority);
} else {
compartment2.set(priority);
}
}
compartment1.setIntersection(compartment2);
sum += compartment1.findFirstSet().?;
}
return sum;
}
pub fn solve_part2(data: []const u8) !usize {
var lines = std.mem.split(u8, data, "\n");
var sum: usize = 0;
var i: usize = 0;
var group = [3]PrioritySet{ PrioritySet.initEmpty(), PrioritySet.initEmpty(), PrioritySet.initEmpty() };
while (i < 3) {
const line = lines.next().?;
if (std.mem.eql(u8, line, "")) break;
var j: usize = 0;
while (j < line.len) : (j += 1) {
group[i].set(try ascii_to_priority(line[j]));
}
if (i == 2) {
group[0].setIntersection(group[1]);
group[0].setIntersection(group[2]);
const priority = group[0].findFirstSet().?;
sum += priority;
i = 0;
group = [3]PrioritySet{ PrioritySet.initEmpty(), PrioritySet.initEmpty(), PrioritySet.initEmpty() };
continue;
}
i += 1;
}
return sum;
}
test "solves part1" {
try std.testing.expectEqual(solve_part1(test_input), 157);
}
test "solves part2" {
try std.testing.expectEqual(solve_part2(test_input), 70);
}

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@ -2,6 +2,7 @@ const std = @import("std");
const day01 = @import("day01.zig");
const day02 = @import("day02.zig");
const day03 = @import("day03.zig");
const utils = @import("utils.zig");
fn solve_day(comptime day_num: u8, day: anytype, stdout: anytype, timer: *std.time.Timer) !void {
@ -28,6 +29,7 @@ pub fn main() !void {
try solve_day(1, day01, &stdout, &timer);
try solve_day(2, day02, &stdout, &timer);
try solve_day(3, day03, &stdout, &timer);
try bw.flush();
}
@ -37,5 +39,6 @@ test {
_ = day01;
_ = day02;
_ = day03;
_ = utils;
}