Advent of Code solutions
Day 2
+52
-6
+1
-1
justfile
+1
-1
justfile
+39
-5
years/2024/src/day_2.rs
+39
-5
years/2024/src/day_2.rs
···
3
3
4
4
pub struct Day2;
5
5
6
+
fn line_valid(line: &[u64]) -> bool {
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+
let mut increasing: Option<bool> = None;
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+
line.windows(2).all(|w| {
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let (x, y) = (w[0], w[1]);
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+
if x == y || x.abs_diff(y) > 3 {
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false
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} else if let Some(increasing) = increasing {
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!((increasing && y <= x) || (!increasing && x <= y))
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+
} else {
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increasing = Some(x < y);
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true
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}
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})
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+
}
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+
6
21
impl Day for Day2 {
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22
8
-
day_stuff!(2, "", "");
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+
day_stuff!(2, "2", "4", Vec<Vec<u64>>);
9
24
10
-
fn part_1(_input: Self::Input) -> Option<String> {
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-
None
25
+
fn part_1(input: Self::Input) -> Option<String> {
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Some(input.into_iter().filter(|v| line_valid(&v)).count().to_string())
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27
}
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28
14
-
fn part_2(_input: Self::Input) -> Option<String> {
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-
None
29
+
fn part_2(input: Self::Input) -> Option<String> {
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+
Some(input.into_iter().filter(|line| {
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+
let valid = line_valid(&line);
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+
if valid {
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true
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+
} else {
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+
(0..line.len()).any(|ie| {
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+
let v = line.iter()
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+
.enumerate()
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.filter(|(i, _)| *i != ie)
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+
.map(|(_, e)| *e)
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.collect::<Vec<_>>();
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+
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line_valid(&v)
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})
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}
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}).count().to_string())
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+
}
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+
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+
fn parse_input(input: &str) -> Self::Input {
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input.split('\n').map(|l| l.split_ascii_whitespace().map(|x| x.parse::<u64>().unwrap()).collect()).collect()
16
50
}
17
51
}
+6
years/2024/src/examples/day_2/1.txt
+6
years/2024/src/examples/day_2/1.txt