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Avoid allocating the final buffer twice

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Bert Peters
2021-12-13 21:40:00 +01:00
parent 5c764f6627
commit 1031a8cdbb
1 changed files with 5 additions and 10 deletions
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15
2021/src/day13.rs
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@@ -107,22 +107,17 @@ fn print_dots(dots: &[Coords]) -> String {
(xc.max(xn as usize + 1), yc.max(yn as usize + 1)) (xc.max(xn as usize + 1), yc.max(yn as usize + 1))
}); });
let mut buffer = vec![b' '; width * height]; let mut buffer = vec![b' '; (width + 1) * height - 1];
for &(x, y) in dots { for &(x, y) in dots {
buffer[x as usize + width * y as usize] = b'#'; buffer[x as usize + (width + 1) * y as usize] = b'#';
} }
let mut result = String::with_capacity((width + 1) * height); for line in buffer.chunks_exact_mut(width + 1) {
line[width] = b'\n';
for line in buffer.chunks_exact(width) {
result += std::str::from_utf8(line).unwrap();
result.push('\n');
} }
result.pop(); String::from_utf8(buffer).unwrap()
result
} }
pub fn part1(input: &mut dyn Read) -> String { pub fn part1(input: &mut dyn Read) -> String {