Complete day 5 part 2
This commit is contained in:
parent
59230b8afb
commit
f3cac78640
@ -4,66 +4,19 @@ use std::collections::HashMap;
|
||||
|
||||
const INPUT: &str = include_str!("input/input.txt");
|
||||
|
||||
fn solve_part1(input: &str) -> Result<usize> {
|
||||
let lines = input.trim().lines();
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
|
||||
struct Point {
|
||||
x: i32,
|
||||
y: i32,
|
||||
}
|
||||
|
||||
let mut covered_points: HashMap<(i32, i32), i32> = HashMap::new();
|
||||
for line in lines {
|
||||
let mut points = line.split(" -> ");
|
||||
let start_point = points.next().unwrap();
|
||||
let mut start_point = start_point.split(',');
|
||||
let start_x = start_point.next().unwrap().parse::<i32>()?;
|
||||
let start_y = start_point.next().unwrap().parse::<i32>()?;
|
||||
let end_point = points.next().unwrap();
|
||||
let mut end_point = end_point.split(',');
|
||||
let end_x = end_point.next().unwrap().parse::<i32>()?;
|
||||
let end_y = end_point.next().unwrap().parse::<i32>()?;
|
||||
|
||||
if start_x == end_x {
|
||||
if start_y <= end_y {
|
||||
for y in start_y..=end_y {
|
||||
let entry = covered_points.entry((start_x, y)).or_insert(0);
|
||||
*entry += 1;
|
||||
}
|
||||
} else {
|
||||
for y in end_y..=start_y {
|
||||
let entry = covered_points.entry((start_x, y)).or_insert(0);
|
||||
*entry += 1;
|
||||
}
|
||||
}
|
||||
} else if start_y == end_y {
|
||||
if start_x <= end_x {
|
||||
for x in start_x..=end_x {
|
||||
let entry = covered_points.entry((x, start_y)).or_insert(0);
|
||||
*entry += 1;
|
||||
}
|
||||
} else {
|
||||
for x in end_x..=start_x {
|
||||
let entry = covered_points.entry((x, start_y)).or_insert(0);
|
||||
*entry += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
println!("{},{} -> {},{}", start_x, start_y, end_x, end_y);
|
||||
for y in 0..=9 {
|
||||
for x in 0..=9 {
|
||||
let overlap = covered_points.get(&(x, y));
|
||||
if let Some(overlap) = overlap {
|
||||
print!("{}", overlap);
|
||||
} else {
|
||||
print!(".");
|
||||
}
|
||||
}
|
||||
print!("\n");
|
||||
}
|
||||
print!("\n");
|
||||
|
||||
}
|
||||
|
||||
for y in 0..=9 {
|
||||
for x in 0..=9 {
|
||||
let overlap = covered_points.get(&(x, y));
|
||||
#[allow(dead_code)]
|
||||
fn print_ocean_floor(covered_points: &HashMap<Point, i32>) {
|
||||
let max_x = covered_points.keys().map(|p| p.x).max().unwrap();
|
||||
let max_y = covered_points.keys().map(|p| p.y).max().unwrap();
|
||||
for y in 0..=max_y {
|
||||
for x in 0..=max_x {
|
||||
let overlap = covered_points.get(&Point { x, y });
|
||||
if let Some(overlap) = overlap {
|
||||
print!("{}", overlap);
|
||||
} else {
|
||||
@ -73,15 +26,108 @@ fn solve_part1(input: &str) -> Result<usize> {
|
||||
print!("\n");
|
||||
}
|
||||
print!("\n");
|
||||
|
||||
|
||||
Ok(covered_points.into_values().filter(|&overlap| overlap >= 2).count())
|
||||
}
|
||||
|
||||
fn solve_part2(input: &str) -> Result<u64> {
|
||||
let lines = input.trim().lines();
|
||||
fn parse_vents(input: &str) -> Result<Vec<(Point, Point)>> {
|
||||
input
|
||||
.trim()
|
||||
.lines()
|
||||
.map(|line| {
|
||||
let mut points = line.split(" -> ");
|
||||
let start_point = points.next().unwrap();
|
||||
let mut start_point = start_point.split(',');
|
||||
let start_x = start_point.next().unwrap().parse::<i32>()?;
|
||||
let start_y = start_point.next().unwrap().parse::<i32>()?;
|
||||
let end_point = points.next().unwrap();
|
||||
let mut end_point = end_point.split(',');
|
||||
let end_x = end_point.next().unwrap().parse::<i32>()?;
|
||||
let end_y = end_point.next().unwrap().parse::<i32>()?;
|
||||
Ok((
|
||||
Point {
|
||||
x: start_x,
|
||||
y: start_y,
|
||||
},
|
||||
Point { x: end_x, y: end_y },
|
||||
))
|
||||
})
|
||||
.collect()
|
||||
}
|
||||
|
||||
Ok(2)
|
||||
fn get_covered_points(vents: Vec<(Point, Point)>) -> Result<HashMap<Point, i32>> {
|
||||
let mut covered_points: HashMap<Point, i32> = HashMap::new();
|
||||
|
||||
for (start, end) in vents.iter() {
|
||||
if start.x == end.x {
|
||||
if start.y <= end.y {
|
||||
for y in start.y..=end.y {
|
||||
let entry = covered_points.entry(Point { x: start.x, y }).or_insert(0);
|
||||
*entry += 1;
|
||||
}
|
||||
} else {
|
||||
for y in end.y..=start.y {
|
||||
let entry = covered_points.entry(Point { x: start.x, y }).or_insert(0);
|
||||
*entry += 1;
|
||||
}
|
||||
}
|
||||
} else if start.y == end.y {
|
||||
if start.x <= end.x {
|
||||
for x in start.x..=end.x {
|
||||
let entry = covered_points.entry(Point { x, y: start.y }).or_insert(0);
|
||||
*entry += 1;
|
||||
}
|
||||
} else {
|
||||
for x in end.x..=start.x {
|
||||
let entry = covered_points.entry(Point { x, y: start.y }).or_insert(0);
|
||||
*entry += 1;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
let mut x = start.x;
|
||||
let mut y = start.y;
|
||||
let dx = end.x - start.x;
|
||||
let dy = end.y - start.y;
|
||||
while (dx > 0 && x <= end.x) || (dx < 0 && x >= end.x) {
|
||||
let entry = covered_points.entry(Point { x, y }).or_insert(0);
|
||||
*entry += 1;
|
||||
if dx > 0 {
|
||||
x += 1;
|
||||
} else {
|
||||
x -= 1;
|
||||
}
|
||||
if dy > 0 {
|
||||
y += 1;
|
||||
} else {
|
||||
y -= 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Ok(covered_points)
|
||||
}
|
||||
|
||||
fn solve_part1(input: &str) -> Result<usize> {
|
||||
let vents = parse_vents(input)?;
|
||||
let vents = vents
|
||||
.into_iter()
|
||||
.filter(|(start, end)| start.x == end.x || start.y == end.y)
|
||||
.collect();
|
||||
let covered_points = get_covered_points(vents)?;
|
||||
|
||||
Ok(covered_points
|
||||
.into_values()
|
||||
.filter(|&overlap| overlap >= 2)
|
||||
.count())
|
||||
}
|
||||
|
||||
fn solve_part2(input: &str) -> Result<usize> {
|
||||
let vents = parse_vents(input)?;
|
||||
let covered_points = get_covered_points(vents)?;
|
||||
|
||||
Ok(covered_points
|
||||
.into_values()
|
||||
.filter(|&overlap| overlap >= 2)
|
||||
.count())
|
||||
}
|
||||
|
||||
fn main() {
|
||||
@ -101,6 +147,6 @@ mod tests {
|
||||
|
||||
#[test]
|
||||
fn solves_part2() {
|
||||
assert_eq!(solve_part2(TEST_INPUT).unwrap(), 0);
|
||||
assert_eq!(solve_part2(TEST_INPUT).unwrap(), 12);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user