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#![allow(dead_code)]
use std::collections::HashMap;
use std::fs::File;
use std::io::Read;
#[derive(Hash, Eq, Debug, PartialEq, Clone, Copy)]
enum Spc {
Rol,
Fix,
Non,
}
fn new_north_y(x: usize, y: usize, m: &Vec<Vec<Spc>>) -> usize {
for yi in (0..y).rev() {
if m[yi][x] != Spc::Non {
return yi + 1;
}
}
// reached the end of map
return 0;
}
fn rotate_positive(m: Vec<Vec<Spc>>) -> Vec<Vec<Spc>> {
let mut out: Vec<Vec<Spc>> = Vec::new();
for i in (0..m[0].len()).rev() {
let mut r: Vec<Spc> = Vec::new();
for j in 0..m.len() {
r.push(m[j][i]);
}
out.push(r);
}
out
}
fn print_m(m: &Vec<Vec<Spc>>) {
for i in 0..m.len() {
for j in 0..m[0].len() {
let a = match m[i][j] {
Spc::Rol => 'O',
Spc::Fix => '#',
Spc::Non => '.',
};
print!("{}", a);
}
println!();
}
println!();
}
fn calc_load(m: &Vec<Vec<Spc>>) -> usize {
let mut load = 0;
for i in 0..m[0].len() {
for j in 0..m.len() {
if m[j][i] == Spc::Rol {
load += m.len() - j;
}
}
}
load
}
fn main() {
// let filename = "in/day14.ref";
let filename = "in/day14.pzl";
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 lines = content.trim_end().split('\n');
let mut m: Vec<Vec<Spc>> = Vec::new();
for line in lines {
let mut r: Vec<Spc> = Vec::new();
for c in line.chars() {
let s = match c {
'O' => Spc::Rol,
'#' => Spc::Fix,
'.' => Spc::Non,
_ => panic!(),
};
r.push(s);
}
m.push(r);
}
let mut m2 = m.clone();
for i in 0..m[0].len() {
for j in 0..m.len() {
if m[j][i] == Spc::Rol {
let new_y = new_north_y(i, j, &m);
m[j][i] = Spc::Non;
m[new_y][i] = Spc::Rol;
}
}
}
let res1 = calc_load(&m);
let mut mm: HashMap<Vec<Vec<Spc>>, u64> = HashMap::new();
let mut cm: HashMap<u64, usize> = HashMap::new();
let mut c0 = 0;
let mut c1 = 0;
for cycle in 0..1000000000 {
for _ in 0..4 {
for i in 0..m2[0].len() {
for j in 0..m2.len() {
if m2[j][i] == Spc::Rol {
let new_y = new_north_y(i, j, &m2);
m2[j][i] = Spc::Non;
m2[new_y][i] = Spc::Rol;
}
}
}
m2 = rotate_positive(m2);
m2 = rotate_positive(m2);
m2 = rotate_positive(m2);
}
if let Some(cycle_start) = mm.insert(m2.clone(), cycle) {
c0 = cycle_start;
c1 = cycle;
break;
}
cm.insert(cycle, calc_load(&m2));
}
// ne vem zakaj rabis ta - 1
let res2 = cm[&((1000000000 - c0 - 1) % (c1 - c0) + c0)];
println!("res1: {}", res1);
println!("res2: {}", res2);
assert_eq!(res1, 103333);
assert_eq!(res2, 97241);
}
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