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here and there optimizations

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javalsai
2025-12-09 18:50:10 +01:00
parent 5d9aa6fc4c
commit 0481138294
1 changed files with 22 additions and 22 deletions
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44
2025/09/p2.rs
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@@ -8,40 +8,38 @@ use std::ops::Range;
#[unsafe(no_mangle)]
pub extern "Rust" fn challenge_usize(buf: &[u8]) -> usize {
// I do see how to make this in idk if O(n) or O(nlogn), but ima O(n^2) just at first
let coords = buf[..(buf.len() - 1)]
.split(|&b| b == b'\n')
.map(parse_ln)
.collect::<Vec<_>>();
// assuming each coord is contiguous to the prev one
let edges = coords
let mut edges = coords
.iter()
.cloned()
.chain([coords[0]])
.map_windows(|&[a, b]| (a, b))
.collect::<Vec<_>>();
let mut area = 0;
for coor1 in &coords {
for coor2 in &coords {
edges.sort_by(|(a1, a2), (b1, b2)| {
(a1.0.abs_diff(a2.0) + a1.1.abs_diff(a2.1))
.cmp(&(b1.0.abs_diff(b2.0) + b1.1.abs_diff(b2.1)))
});
let mut max_area = 0;
for (i, coor1) in coords.iter().enumerate() {
for coor2 in coords.iter().skip(i) {
let dx = coor1.0.abs_diff(coor2.0) + 1;
let dy = coor1.1.abs_diff(coor2.1) + 1;
let this_area = dx * dy;
let area = dx * dy;
// println!("{coor1:?}, {coor2:?}");
if is_really_contained((*coor1, *coor2), &edges) {
area = area.max(this_area);
max_area = max_area.max(area);
}
// println!(
// "{},{} {},{} | {this_area}",
// coor1.0, coor1.1, coor2.0, coor2.1
// );
}
}
area
max_area
}
/// If any bouding vertex is well within (not sitting on a rectangle's edge), the rectangle is not
@@ -60,16 +58,18 @@ fn is_really_contained(
// Optimization, no need to check each range's point
for (edge1, edge2) in edges {
if edge1.0 == edge2.0 && xran.contains(&edge1.0) {
if rangeoverlap(&mkrange(edge1.1, edge2.1), &yran) {
return false;
}
if edge1.0 == edge2.0
&& xran.contains(&edge1.0)
&& rangeoverlap(&mkrange(edge1.1, edge2.1), &yran)
{
return false;
}
if edge1.1 == edge2.1 && yran.contains(&edge1.1) {
if rangeoverlap(&mkrange(edge1.0, edge2.0), &xran) {
return false;
}
if edge1.1 == edge2.1
&& yran.contains(&edge1.1)
&& rangeoverlap(&mkrange(edge1.0, edge2.0), &xran)
{
return false;
}
}