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|
use std::collections::HashSet;
use std::env;
use std::fs::File;
use std::io::{BufRead, BufReader};
#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
struct Point {
x: usize,
y: usize,
height: u32,
}
#[derive(Debug, Clone, PartialEq, Eq)]
struct Basin {
points: HashSet<Point>,
}
fn main() {
let reader = open_file();
let mut points: Vec<Vec<u32>> = Vec::new();
let mut basins: Vec<Basin> = Vec::new();
for line in reader.lines() {
points.push(
line.unwrap()
.trim()
.chars()
.map(|x| x.to_digit(10).unwrap())
.collect(),
);
}
let nine = vec![9];
let mut risk_level: u32 = 0;
for (idx, height) in points.iter().enumerate() {
for (ndx, num) in height.iter().enumerate() {
let up = points
.get(((idx as isize) - 1) as usize)
.unwrap_or(&nine)
.get(ndx)
.unwrap_or(&9);
let down = points
.get(idx + 1)
.unwrap_or_else(|| &nine)
.get(ndx)
.unwrap_or_else(|| &9);
let left = height
.get((ndx as isize - 1) as usize)
.unwrap_or_else(|| &9);
let right = height
.get((ndx as isize + 1) as usize)
.unwrap_or_else(|| &9);
if num < up && num < down && num < right && num < left {
risk_level += 1 + *num;
basins.push(Basin {
points: HashSet::from_iter(vec![Point {
x: idx,
y: ndx,
height: *num,
}]),
});
}
}
}
// TODO: fix this maybe because i hate it <20-12-21, yigit> //
for basin in basins.iter_mut() {
let mut stack: Vec<Point> = Vec::new();
stack.extend(basin.points.clone().into_iter());
while !stack.is_empty() {
let minibasin = stack.pop().unwrap();
let up = points
.get(((minibasin.x as isize) - 1) as usize)
.unwrap_or(&nine)
.get(minibasin.y)
.unwrap_or(&9);
let down = match points.get(minibasin.x + 1) {
Some(line) => line.get(minibasin.y).unwrap_or(&9),
None => &9,
};
let left = match points.get(minibasin.x) {
Some(line) => line
.get(((minibasin.y as isize) - 1) as usize)
.unwrap_or(&9),
None => &9,
};
let right = match points.get(minibasin.x) {
Some(line) => line.get(minibasin.y + 1).unwrap_or(&9),
None => &9,
};
if up != &9 {
let p = Point {
x: minibasin.x - 1,
y: minibasin.y,
height: *up,
};
if !basin.points.contains(&p) {
stack.push(p);
basin.points.insert(p);
}
}
if down != &9 {
let p = Point {
x: minibasin.x + 1,
y: minibasin.y,
height: *down,
};
if !basin.points.contains(&p) {
stack.push(p);
basin.points.insert(p);
}
}
if left != &9 {
let p = Point {
x: minibasin.x,
y: minibasin.y - 1,
height: *left,
};
if !basin.points.contains(&p) {
stack.push(p);
basin.points.insert(p);
}
}
if right != &9 {
let p = Point {
x: minibasin.x,
y: minibasin.y + 1,
height: *right,
};
if !basin.points.contains(&p) {
stack.push(p);
basin.points.insert(p);
}
}
}
}
let mut lens: Vec<usize> = basins.iter().map(|x| x.points.len()).collect();
lens.sort_unstable();
lens.reverse();
let biggest_basins: usize = lens.iter().take(3).product();
println!("{}", biggest_basins);
println!("{}", risk_level);
}
fn open_file() -> BufReader<File> {
let args: Vec<String> = env::args().collect();
if args.len() != 2 {
eprintln!("Usage: {} <filename>", args[0]);
std::process::exit(1);
}
let filename = &args[1];
let file = File::open(filename).unwrap_or_else(|_| panic!("No such file: {}", filename));
BufReader::new(file)
}
|
