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day 2.11

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This commit is contained in:
Rh4096 2024-12-03 18:32:40 +07:00
parent 876ca26900
commit 38b90ed1ff
1 changed files with 29 additions and 37 deletions
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66
src/solutions/day_2.rs
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@ -1,46 +1,40 @@
use super::AocSolution;
fn is_safe(levels: &[i32]) -> bool {
let dec = levels[0] > levels[1];
for (cur, nxt) in levels.windows(2).map(|w| (w[0], w[1])) {
let diff = cur - nxt;
if diff == 0 || diff.abs() > 3 || (diff > 0) != dec {
return false;
}
}
true
}
fn is_safe_with_rem(levels: &[i32]) -> bool {
for i in 0..levels.len() {
let mut lvl = levels[0..i].to_vec();
lvl.extend_from_slice(&levels[(i + 1)..]);
if is_safe(&lvl) {
return true;
}
}
false
}
#[derive(Clone, Copy)]
pub struct AocDayTwoSolution;
struct LevelValidator;
impl LevelValidator {
fn is_safe(&self, levels: &[i32]) -> bool {
let dec = levels[0] > levels[1];
for (cur, nxt) in levels.windows(2).map(|w| (w[0], w[1])) {
let diff = cur - nxt;
if diff == 0 || diff.abs() > 3 || (diff > 0) != dec {
return false;
}
}
true
}
fn is_safe_with_rem(&self, levels: &[i32]) -> bool {
for i in 0..levels.len() {
let mut lvl = levels[0..i].to_vec();
lvl.extend_from_slice(&levels[(i + 1)..]);
if self.is_safe(&lvl) {
return true;
}
}
false
}
}
impl AocSolution for AocDayTwoSolution {
type Output = u64;
const INPUT: &str = include_str!("../../input/day2.txt");
fn part_one(&self) -> Self::Output {
let validator = LevelValidator;
Self::INPUT
.lines()
.map(|n| {
@ -48,13 +42,11 @@ impl AocSolution for AocDayTwoSolution {
.filter_map(|x| x.parse::<i32>().ok())
.collect::<Vec<_>>()
})
.filter(|s| validator.is_safe(s))
.filter(|s| is_safe(s))
.count() as u64
}
fn part_two(&self) -> Self::Output {
let validator = LevelValidator;
Self::INPUT
.lines()
.map(|n| {
@ -62,7 +54,7 @@ impl AocSolution for AocDayTwoSolution {
.filter_map(|x| x.parse::<i32>().ok())
.collect::<Vec<_>>()
})
.filter(|s| validator.is_safe(s) || validator.is_safe_with_rem(s))
.filter(|s| is_safe(s) || is_safe_with_rem(s))
.count() as u64
}
}