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🚧 Day 2: Failed attempt at solving part 2

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LeMoonStar 2024-12-02 07:26:48 +01:00
parent faec1277d3
commit b397d625c8
1 changed files with 36 additions and 47 deletions
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83
src/days/d02.rs
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@ -11,60 +11,52 @@ pub enum Direction {
pub struct Report(Vec<i8>); pub struct Report(Vec<i8>);
impl Report { impl Report {
pub fn is_safe(&self, tolerance: usize) -> bool { pub fn is_safe(&self, mut tolerance: usize) -> bool {
let mut direction = None; let mut direction = None;
let mut failures = 0; let mut skip = false;
let mut skip_last = false;
for i in 1..self.0.len() { for i in 1..self.0.len() {
match ( if skip {
self.0[i] skip = false;
- self.0[i - if skip_last { continue;
skip_last = false;
2
} else {
1
}],
&direction,
) {
/* Over limits */
(..=-4 | 4.., _) => {
failures += 1;
skip_last = true;
}
/* Decide on direction */
(..=-1, None) => direction = Some(Direction::Decreasing),
(1.., None) => direction = Some(Direction::Increasing),
/* Wrong Direction */
(1.., Some(Direction::Decreasing)) => {
failures += 1;
skip_last = true;
}
(..=-1, Some(Direction::Increasing)) => {
failures += 1;
skip_last = true;
}
/* No Change */
(0, _) => {
failures += 1;
skip_last = true;
}
_ => {}
} }
if failures > tolerance { if !Self::safe_comparison(self.0[i - 1], self.0[i], &mut direction) {
if tolerance > 0 && i > 1 {
tolerance -= 1;
if !Self::safe_comparison(self.0[i - 2], self.0[i], &mut direction) {
skip = true;
continue;
}
}
return false; return false;
} }
if skip_last {
println!("SKIPPING {}", i);
}
} }
true true
} }
fn safe_comparison(a: i8, b: i8, direction: &mut Option<Direction>) -> bool {
match (b - a, &direction) {
/* Over limits */
(..=-4 | 4.., _) => return false,
/* Decide on direction */
(..=-1, None) => *direction = Some(Direction::Decreasing),
(1.., None) => *direction = Some(Direction::Increasing),
/* Wrong Direction */
(1.., Some(Direction::Decreasing)) => return false,
(..=-1, Some(Direction::Increasing)) => return false,
/* No Change */
(0, _) => return false,
_ => {}
}
return true;
}
} }
impl From<&str> for Report { impl From<&str> for Report {
@ -95,7 +87,6 @@ impl DayImpl<Data> for Day<CURRENT_DAY> {
fn one(&self, data: &mut Data) -> Answer { fn one(&self, data: &mut Data) -> Answer {
let mut safe_count = 0; let mut safe_count = 0;
for report in data { for report in data {
println!("{:?}", report);
if report.is_safe(0) { if report.is_safe(0) {
safe_count += 1; safe_count += 1;
} }
@ -107,9 +98,7 @@ impl DayImpl<Data> for Day<CURRENT_DAY> {
fn two(&self, data: &mut Data) -> Answer { fn two(&self, data: &mut Data) -> Answer {
let mut safe_count = 0; let mut safe_count = 0;
for report in data { for report in data {
println!("{:?}", report);
if report.is_safe(1) { if report.is_safe(1) {
println!("Safe!");
safe_count += 1; safe_count += 1;
} }
} }