codspeed-aoc -


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#![allow(
    confusable_idents,
    uncommon_codepoints,
    non_upper_case_globals,
    internal_features,
    mixed_script_confusables,
    incomplete_features
)]
#![feature(
    slice_swap_unchecked,
    generic_const_exprs,
    iter_array_chunks,
    get_many_mut,
    maybe_uninit_uninit_array,
    iter_collect_into,
    let_chains,
    anonymous_lifetime_in_impl_trait,
    array_windows,
    slice_take,
    test,
    slice_as_chunks,
    array_chunks,
    slice_split_once,
    core_intrinsics
)]
mod util;
pub mod day2 {
use crate::util;
    use crate::util::prelude::*;
    #[no_mangle]
    fn check(x: &[i8]) -> bool {
        if x.len() > 8 {
            unsafe { std::hint::unreachable_unchecked() }
        }
        let state = unsafe { x.first_chunk::<2>().map(|[a, b]| a < b).unwrap_unchecked() };
        x.array_windows::<2>().all(|[a, b]| match state {
            true if !(1..=3).contains(&(b - a)) => return false,
            false if !(1..=3).contains(&(a - b)) => return false,
            _ => true,
        })
    }

    pub fn part1(i: &str) -> impl Display {
        let mut items = [0; 8];
        i.行()
            .filter(|x| {
                let mut len = 0;
                let mut s = 0;
                for &b in *x {
                    match b {
                        b' ' => {
                            C! { items[len] = s as i8 };
                            len += 1;
                            s = 0;
                        }
                        b => s = s * 10 + (b - b'0'),
                    }
                }
                C! { items[len] = s as i8 };
                let slice = C! { &items[..len + 1] };
                check(slice)
                // (0..items.len()).any(|n| {
                //     let mut items = items.clone();
                //     items.remove(n);
                //     check2(&items)
                // })
            })
            .count()
    }

    #[no_mangle]
    fn check_pof(x: &[i8]) -> Result<(), u8> {
        if x.len() > 8 {
            unsafe { std::hint::unreachable_unchecked() }
        }
        let state = match unsafe {
            x.first_chunk::<2>()
                .map(|[a, b]| a.cmp(b))
                .unwrap_unchecked()
        } {
            std::cmp::Ordering::Equal => return Err(0),
            std::cmp::Ordering::Greater => false,
            std::cmp::Ordering::Less => true,
        };
        // windows at home 😔
        for i in 1..x.len() as u8 - 1 {
            let [a, b] = util::nail(&x[i as usize..]);
            match state {
                true if !(1..=3).contains(&(b - a)) => return Err(i),
                false if !(1..=3).contains(&(a - b)) => return Err(i),
                _ => (),
            }
        }
        Ok(())
    }
    #[no_mangle]
    pub fn part2(i: &str) -> impl Display {
        let mut items = [0; 8];

        i.行()
            .filter(|x| {
                let mut len = 0;
                let mut s = 0;
                for &b in *x {
                    match b {
                        b' ' => {
                            C! { items[len] = s as i8 };
                            len += 1;
                            s = 0;
                        }
                        b => {
                            s = s * 10 + (b - b'0');
                        }
                    }
                }
                C! { items[len] = s as i8 };
                let slice = C! { &items[..len + 1] };
                match check_pof(slice) {
                    Ok(()) => true,
                    Err(i) => {
                        let i = i as usize;
                        let mut place = [0i8; 7];
                        macro_rules! rmv {
                            ($i:expr, $si: expr) => {{
                                place[..$i].copy_from_slice(&slice[..$i]);
                                let put = &slice[$si..];
                                place[$i..$i + put.len()].copy_from_slice(put);
                                &place[..slice.len() - 1]
                            }};
                        }
                        check(rmv!(i, i + 1)) // [1, 2, >i<, 4, 5]
                        || check(rmv!(i + 1, i + 2)) // [1, 2, i, >4<, 5]
                        || (i > 0 && check(rmv!(i - 1, i))) // [1, >2<, i, 4, 5]
                    }
                }
            })
            .count()
    }
}