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#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]
use std::env;
use std::fs::File;
use std::io::Read;
#[derive(Debug, PartialEq, Clone, Copy)]
enum Field {
Wall,
Box,
Empty,
}
fn sim(rx: i64, ry: i64, dx: i64, dy: i64, mut m: &mut Vec<Vec<Field>>) -> (i64, i64) {
let mx = rx + dx;
let my = ry + dy;
let f = m[my as usize][mx as usize];
if f == Field::Empty {
return (mx, my);
} else if f == Field::Wall {
return (rx, ry);
}
let mut x = mx + dx;
let mut y = my + dy;
loop {
let f = m[y as usize][x as usize];
if f == Field::Wall {
return (rx, ry);
}
if f == Field::Empty {
m[my as usize][mx as usize] = Field::Empty;
m[y as usize][x as usize] = Field::Box;
return (mx, my);
}
x += dx;
y += dy;
}
}
fn gps(m: &Vec<Vec<Field>>) -> i64 {
let mut ret = 0;
for y in 0..m.len() {
for x in 0..m[0].len() {
if m[y][x] == Field::Box {
ret += 100 * y + x;
}
}
}
return ret as i64;
}
fn print_m(m: &Vec<Vec<Field>>) {
for l in m {
for f in l {
match f {
Field::Box => print!("O"),
Field::Empty => print!("."),
Field::Wall => print!("#"),
}
}
println!();
}
}
fn main() {
let args: Vec<String> = env::args().collect();
let filename = if args.len() == 1 {
"in/".to_owned() + args[0].split('/').last().unwrap() + ".pzl"
} else {
args[1].clone()
};
let mut f = File::open(filename).expect("cannot open file");
let mut content = String::new();
f.read_to_string(&mut content).expect("cannot read file");
let (para1, para2) = content.trim_end().split_once("\n\n").unwrap();
let mut rx = 0;
let mut ry = 0;
let mut m: Vec<Vec<Field>> = Vec::new();
for (y, line) in para1.split("\n").enumerate() {
let mut l: Vec<Field> = Vec::new();
for (x, c) in line.chars().enumerate() {
let x = x as i64;
let y = y as i64;
if c == '@' {
rx = x;
ry = y;
}
if c == 'O' {
l.push(Field::Box);
} else if c == '#' {
l.push(Field::Wall);
} else {
l.push(Field::Empty);
}
}
m.push(l);
}
let mut dirs: Vec<(i64, i64)> = Vec::new();
for line in para2.split("\n") {
for c in line.chars() {
let d = match c {
'<' => (-1, 0),
'>' => (1, 0),
'^' => (0, -1),
'v' => (0, 1),
_ => panic!(),
};
dirs.push(d);
}
}
//println!("{:?}", dirs);
for dir in dirs {
(rx, ry) = sim(rx, ry, dir.0, dir.1, &mut m);
//print_m(&m);
}
let res1 = gps(&m);
let mut res2 = 0;
println!("res1: {}", res1);
println!("res2: {}", res2);
//assert_eq!(res1, 1414416);
//assert_eq!(res2, );
}
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