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Day 02 use just iterators

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Tobias Berger 2024-12-02 15:18:17 +01:00
parent 3509e0916e
commit 1801f30cd6
Signed by: toby
GPG key ID: 2D05EFAB764D6A88
1 changed files with 10 additions and 19 deletions
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29
day02/main.rs
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@ -24,7 +24,7 @@ pub fn main() {
fn is_safe(report: &Vec<i32>) -> bool { fn is_safe(report: &Vec<i32>) -> bool {
let increasing = report[0] < report[1]; let increasing = report[0] < report[1];
report.array_windows::<2>().all(|window| { report.array_windows::<2>().all(|window| {
let increase = window[1] as i32 - window[0] as i32; let increase = window[1] - window[0];
if increasing { if increasing {
1 <= increase && increase <= 3 1 <= increase && increase <= 3
} else { } else {
@ -34,27 +34,18 @@ fn is_safe(report: &Vec<i32>) -> bool {
} }
fn part_1(input: &Vec<Vec<i32>>) -> i32 { fn part_1(input: &Vec<Vec<i32>>) -> i32 {
let mut safe = 0; input.iter().filter(|&report| is_safe(report)).count() as i32
for report in input {
if is_safe(report) {
safe += 1;
}
}
safe
} }
fn part_2(input: &Vec<Vec<i32>>) -> i32 { fn part_2(input: &Vec<Vec<i32>>) -> i32 {
let mut safe = 0; input
for report in input { .iter()
for i in 0..report.len() { .filter(|report| {
let modified_report = [&report[..i], &report[i + 1..]].concat(); (0..report.len())
if is_safe(&modified_report) { .map(|i| [&report[..i], &report[i + 1..]].concat())
safe += 1; .any(|modified_report| is_safe(&modified_report))
break; })
} .count() as i32
}
}
safe
} }
#[cfg(test)] #[cfg(test)]