aoc - heh


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#![allow(
    unexpected_cfgs,
    confusable_idents,
    uncommon_codepoints,
    non_upper_case_globals,
    internal_features,
    mixed_script_confusables,
    static_mut_refs,
    incomplete_features,
    unused_imports,
    unsafe_op_in_unsafe_fn,
    redundant_semicolons
)]
#![feature(
    iterator_try_reduce,
    step_trait,
    cmp_minmax,
    custom_inner_attributes,
    extend_one,
    slice_as_array,
    impl_trait_in_bindings,
    iter_partition_in_place,
    slice_swap_unchecked,
    generic_const_exprs,
    iter_array_chunks,
    slice_from_ptr_range,
    if_let_guard,
    once_cell_get_mut,
    iter_collect_into,
    anonymous_lifetime_in_impl_trait,
    array_windows,
    vec_into_raw_parts,
    try_blocks,
    portable_simd,
    test,
    slice_split_once,
    import_trait_associated_functions,
    core_intrinsics
)]
extern crate test;
pub mod util;

pub use atools::prelude::*;
use atools::{CollectArray, prelude::*};
use itertools::chain;
use lower::apply;
use md5::{Digest, Md5};
use memchr::memmem;
use regex::bytes::Regex;
use rustc_hash::FxBuildHasher;
use std::{
    cmp::{Reverse, minmax},
    mem::take,
    simd::prelude::*,
};
use swizzle::array;
pub use util::prelude::*;

#[allow(warnings)]
type u32x3 = Simd<u32, 3>;

#[unsafe(no_mangle)]
#[implicit_fn::implicit_fn]
pub unsafe fn p1(x: &[u8; ISIZE]) -> impl Display {
    let grid = x.chunked::<178>();
    let map = (0..8)
        .tuple_combinations()
        .map_w(|(a, b)| {
            util::steps(
                grid.find(a + b'0'),
                |x| {
                    Dir::ALL
                        .iter()
                        .flat_map(move |&d| d + x)
                        .filter(|&(x, y)| grid[y][x] != b'#')
                },
                |&x| x == grid.find(b + b'0'),
            )
            .unwrap()
            .1
        })
        .collect_twm();
    (1..8)
        .permutations(7)
        .map(|x| {
            chain! {
                once(0),
                x,
                once(0) // p2
            }
            .tuple_windows()
            .map(|(a, b)| map[&(a, b)])
            .sum::<usize>()
        })
        .min()
        .unwrap()
}
const ISIZE: usize = include_bytes!("inp.txt").len();
fn main() {
    unsafe { println!("{}", p1(include_bytes!("inp.txt"))) };
}

#[bench]
fn benc(b: &mut test::Bencher) {
    let i = boxd(include_bytes!("inp.txt"));
    b.iter(|| unsafe { p1(i) });
}