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#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]
use std::fmt;
use std::fs::File;
use std::io::Read;
#[derive(Eq, PartialEq, Clone, Copy)]
enum State {
Ok,
Nok,
Unk,
}
impl std::fmt::Debug for State {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let a = match self {
State::Ok => '.',
State::Nok => '#',
State::Unk => '?',
};
write!(f, "{}", a)
}
}
type Line = (Vec<State>, Vec<usize>);
fn rec(l: Line) -> usize {
for i in 0..l.0.len() {
if l.0[i] == State::Unk {
let mut sum = 0;
let mut l1 = l.clone();
let mut l2 = l.clone();
l1.0[i] = State::Ok;
l2.0[i] = State::Nok;
sum += rec(l1);
sum += rec(l2);
return sum;
}
}
if is_valid(&l) {
return 1;
} else {
return 0;
}
}
fn is_valid(l: &Line) -> bool {
let mut a: Vec<usize> = Vec::new();
let mut prev = State::Ok;
let mut count = 0;
for i in 0..l.0.len() {
if l.0[i] == State::Nok {
count += 1;
} else if l.0[i] == State::Ok && prev == State::Nok {
a.push(count);
count = 0;
}
prev = l.0[i];
}
if count != 0 {
a.push(count);
}
let ret = a == l.1;
ret
}
fn rec2(mut s: &[State], mut arr: &[usize], depth: u32) -> usize {
// println!("{} {:?} {:?}", depth, s, arr);
if arr.len() == 0 {
// println!("ret 1");
return 1;
}
if s.len() == 0 {
// println!("ret 0");
return 0;
}
if s.len() < arr.iter().fold(0, |x, y| x + y) + arr.len() - 1 {
// println!("ret 0");
return 0;
}
let n = arr[0];
let arr = &arr[1..];
let mut ret = 0;
for i in 0..(s.len() - n) {
let mut all = true;
// check before first #
for ii in 0..i {
if s[ii] == State::Nok {
all = false;
}
}
// check if # * n
for ii in 0..n {
if s[i + ii] == State::Ok {
all = false;
}
}
// check if next is not #
if s[i + n] == State::Nok {
all = false;
}
if all {
ret += rec2(&s[i + n + 1..], arr, depth + 1);
}
}
if s.len() == n {
let mut all = true;
for ii in 0..n {
if s[ii] == State::Ok {
all = false;
}
}
if all {
// println!("ret 1");
return 1;
}
}
// handle last digit and last place
if arr.len() == 0 {
let mut all = true;
for i in 0..(s.len() - n) {
// check before first #
if s[i] == State::Nok {
all = false;
}
}
for i in (s.len() - n)..s.len() {
// check if # * n
if s[i] == State::Ok {
all = false;
}
}
if all {
ret += 1;
}
}
ret
}
fn main() {
let filename = "in/day12.ref";
// let filename = "in/day12.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 ls: Vec<Line> = Vec::new();
for line in lines {
let (a, b) = line.split_once(' ').unwrap();
let mut l: Line = (Vec::new(), Vec::new());
for c in a.chars() {
let s = match c {
'.' => State::Ok,
'#' => State::Nok,
'?' => State::Unk,
_ => panic!(),
};
l.0.push(s);
}
for c in b.split(',') {
l.1.push(c.parse().unwrap());
}
ls.push(l);
}
let mut res1 = 0;
let mut res2 = 0;
// for l in ls {
// let a = rec(l);
// // println!("{}", a);
// res1 += a;
// }
let mut ls2: Vec<Line> = Vec::new();
for i in 0..ls.len() {
let mut l2: Line = Default::default();
for _ in 0..5 {
l2.0.append(&mut ls[i].0.clone());
l2.0.push(State::Unk);
l2.1.append(&mut ls[i].1.clone());
}
ls2.push(l2);
}
// for l in [ls2[0].clone()] {
// for l in [ls[5].clone()] {
for l in ls2 {
let a = rec2(&l.0, &l.1, 0);
println!("{}", a);
res2 += a;
}
println!("res1: {}", res1);
println!("res2: {}", res2);
}
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