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D16p2 #14

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e58d70f
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alion02 Dec 17, 2024
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alion02 Dec 17, 2024
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44 changes: 23 additions & 21 deletions src/day16.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ unsafe fn inner1(s: &[u8]) -> u32 {
static mut NEXT: [Node; 4096] = [unsafe { transmute(0) }; 4096];
static OFFSET: [i16; 4] = [1, row_len!(), -1, -row_len!()];

let mut visited = [0u8; row_len!() * side_len!()];
let mut visited = [0u8; row_len!() * side_len!() / 2];
let mut curr = &mut CURR;
let mut next = &mut NEXT;
let offset = &OFFSET;
Expand Down Expand Up @@ -61,9 +61,10 @@ unsafe fn inner1(s: &[u8]) -> u32 {
}
let mut dir = node.dir;
let visit_mask = 1 << (dir & 1);
let visit_idx = pos as usize / 2;
'delete: {
if *visited.get_unchecked(pos as usize) & visit_mask == 0 {
*visited.get_unchecked_mut(pos as usize) |= visit_mask;
if *visited.get_unchecked(visit_idx) & visit_mask == 0 {
*visited.get_unchecked_mut(visit_idx) |= visit_mask;
dir ^= 1;
{
let pos = pos.wrapping_add_signed(*offset.get_unchecked(dir as usize));
Expand Down Expand Up @@ -123,13 +124,13 @@ unsafe fn inner2(s: &[u8]) -> u32 {
static mut NEXT: [Node; 4096] = [unsafe { transmute(0) }; 4096];
static OFFSET: [i16; 4] = [1, row_len!(), -1, -row_len!()];

let mut visited = [0u8; row_len!() * side_len!()];
let mut visited = [0u8; row_len!() * side_len!() / 2];
let mut origins = [Origin {
dirpos1: !0,
dirpos2: !0,
dirpos3: !0,
total_cost: !0,
}; row_len!() * side_len!() * 4];
}; row_len!() * side_len!() * 2];
let mut curr = &mut CURR;
let mut next = &mut NEXT;
let offset = &OFFSET;
Expand All @@ -145,10 +146,10 @@ unsafe fn inner2(s: &[u8]) -> u32 {
#[derive(Clone, Copy)]
#[repr(align(8))]
struct Origin {
dirpos1: u32,
dirpos2: u32,
dirpos3: u32,
total_cost: u32,
dirpos1: u16,
dirpos2: u16,
dirpos3: u16,
total_cost: u16,
}

curr[0] = Node {
Expand All @@ -175,18 +176,19 @@ unsafe fn inner2(s: &[u8]) -> u32 {
final_cost = turn_cost + cost as u32 * 2;
}
let mut dir = node.dir;
let dirpos = pos as u32 * 4 + dir as u32;
let dirpos = (pos as u32 * 2 + dir as u32) as u16;
let visit_mask = 1 << (dir & 1);
let visit_idx = pos as usize / 2;
'delete: {
if *visited.get_unchecked(pos as usize) & visit_mask == 0 {
*visited.get_unchecked_mut(pos as usize) |= visit_mask;
if *visited.get_unchecked(visit_idx) & visit_mask == 0 {
*visited.get_unchecked_mut(visit_idx) |= visit_mask;
dir ^= 1;
{
let mut npos = pos.wrapping_add_signed(*offset.get_unchecked(dir as usize));
if *s.get_unchecked(npos as usize) != b'#' {
npos = npos.wrapping_add_signed(*offset.get_unchecked(dir as usize));
let origin = origins.get_unchecked_mut(npos as usize * 4 + dir as usize);
let total_cost = turn_cost + next_cost as u32 * 2 + 1000;
let origin = origins.get_unchecked_mut(npos as usize * 2 + dir as usize);
let total_cost = (turn_cost + next_cost as u32 * 2 + 1000) as u16;
if origin.total_cost >= total_cost {
origin.total_cost = total_cost;
if origin.dirpos1 == !0 {
Expand All @@ -210,8 +212,8 @@ unsafe fn inner2(s: &[u8]) -> u32 {
let mut npos = pos.wrapping_add_signed(*offset.get_unchecked(dir as usize));
if *s.get_unchecked(npos as usize) != b'#' {
npos = npos.wrapping_add_signed(*offset.get_unchecked(dir as usize));
let origin = origins.get_unchecked_mut(npos as usize * 4 + dir as usize);
let total_cost = turn_cost + next_cost as u32 * 2 + 1000;
let origin = origins.get_unchecked_mut(npos as usize * 2 + dir as usize);
let total_cost = (turn_cost + next_cost as u32 * 2 + 1000) as u16;
if origin.total_cost >= total_cost {
origin.total_cost = total_cost;
if origin.dirpos1 == !0 {
Expand All @@ -234,8 +236,8 @@ unsafe fn inner2(s: &[u8]) -> u32 {
let mut npos = pos.wrapping_add_signed(*offset.get_unchecked(dir as usize));
if *s.get_unchecked(npos as usize) != b'#' {
npos = npos.wrapping_add_signed(*offset.get_unchecked(dir as usize));
let origin = origins.get_unchecked_mut(npos as usize * 4 + dir as usize);
let total_cost = turn_cost + next_cost as u32 * 2;
let origin = origins.get_unchecked_mut(npos as usize * 2 + dir as usize);
let total_cost = (turn_cost + next_cost as u32 * 2) as u16;
if origin.total_cost >= total_cost {
origin.total_cost = total_cost;
if origin.dirpos1 == !0 {
Expand Down Expand Up @@ -277,10 +279,10 @@ unsafe fn inner2(s: &[u8]) -> u32 {

let mut res = 0;

for dirpos in [(row_len!() + far_edge!()) * 4, (row_len!() + far_edge!()) * 4 + 3] {
for dirpos in [(row_len!() + far_edge!()) * 2, (row_len!() + far_edge!()) * 2 + 3] {
let origin = origins.get_unchecked_mut(dirpos);
if origin.total_cost == final_cost {
unsafe fn mark_path(origins: &mut [Origin; row_len!() * side_len!() * 4], dirpos: usize) -> i32 {
if origin.total_cost == final_cost as u16 {
unsafe fn mark_path(origins: &mut [Origin; row_len!() * side_len!() * 2], dirpos: usize) -> i32 {
let origin = *origins.get_unchecked(dirpos);
let mut total = 0;
if origin.dirpos1 < !0 {
Expand Down
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