aoc - heh


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#![allow(
    confusable_idents,
    uncommon_codepoints,
    non_upper_case_globals,
    internal_features,
    mixed_script_confusables,
    static_mut_refs,
    incomplete_features
)]
#![feature(
    iter_repeat_n,
    slice_swap_unchecked,
    generic_const_exprs,
    iter_array_chunks,
    get_many_mut,
    maybe_uninit_uninit_array,
    iter_collect_into,
    hint_assert_unchecked,
    let_chains,
    anonymous_lifetime_in_impl_trait,
    array_windows,
    vec_into_raw_parts,
    try_blocks,
    slice_take,
    portable_simd,
    test,
    slice_as_chunks,
    array_chunks,
    slice_split_once,
    core_intrinsics
)]
extern crate test;
pub mod util;
use util::countg;
pub use util::prelude::*;

#[no_mangle]
pub fn run(i: &str) -> impl Display {
    let i = i.as_bytes();
    // let set = [0; i.len()]
    let size = memchr::memchr(b'\n', i).ψ();
    let max = size * (size + 1);
    unsafe { core::hint::assert_unchecked(i.len() == max) };
    let get = |j: usize| (j < max).then(|| i[j]);

    // fimg::Image::<Vec<u8>, 1>::build(SIZE as _, SIZE as _)
    //     .buf(
    //         grid.iter()
    //             .flat_map(|x| &x[..SIZE])
    //             .map(|x| (((*x - b'0') as f32 / 10.0) * 255.0) as u8)
    //             .collect_vec(),
    //     )
    //     .scale::<fimg::scale::Nearest>(SIZE as u32 * 8, SIZE as u32 * 8)
    //     .save("hmm.png");
    let mut tot = 0;
    for i in memchr::memchr_iter(b'9', i) {
        // if get(i) == Some(b'9') {
        util::countg_with_check(
            i,
            &mut |i| {
                [
                    i.wrapping_add(1),
                    i.wrapping_sub(1),
                    i.wrapping_add(size + 1),
                    i.wrapping_sub(size + 1),
                ]
                .into_iter()
            },
            &mut |i1, i2| match get(i2) {
                Some(x) => get(i1).ψ().wrapping_sub(x) == 1,
                None => false,
            },
            &mut tot,
            &mut |i| get(i) == Some(b'0'),
            // &mut HashSet::default(),
        );
        // }
    }
    tot
}

fn main() {
    // (1..u32::MAX as u64).for_each(|a| assert_eq!(a.ilog10() + 1, digs(a)));
    // let mut s = String::new();
    // for i in 0..1280 {
    let i = include_str!("inp.txt");
    //     s.push_str(i);
    // }
    // std::fs::write("src/inp.txt", s);
    // println!("{}", p2(i));
    println!("{}", run(i));
    // println!("{}", p1(i));
}

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