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stole code and now it works

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This commit is contained in:
Lea 2023-12-13 09:50:27 +01:00
parent cafdfd324c
commit e69bf8e9ff
Signed by: Lea
GPG key ID: 1BAFFE8347019C42
3 changed files with 1063 additions and 1074 deletions
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1000
day_12/input copy.txt
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day_12/input.txt
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day_12/part_2/src/main.rs
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@ -1,76 +1,71 @@
use std::{thread::{self, JoinHandle}, time::Instant};
use std::collections::HashMap;
use regex::Regex;
// i could just figure out a proper way but bruteforce is funnier
// but also its still way too slow so ill fix it tomorrow maybe
fn cache_key(cur: &String, instructions: &Vec<i32>) -> String {
return format!("{}:{:?}", cur, instructions);
}
// this approach is entirely stolen from github, i just rewrote it in rust
// i'm not in a state to make my braincells operate at the level required for this task
// was enough of a challenge to even get this to work at all because rust is a fucking nuisance with basic tasks
// https://github.com/jsgrosman/advent-code-challenges/blob/main/advent2023/advent12.ts <3
fn count_valid(in_str: &String, instructions: &Vec<i32>, cache: &mut HashMap<String, i64>) -> i64 {
if cache.contains_key(&cache_key(&in_str, &instructions)) {
return *cache.get(&cache_key(&in_str, &instructions)).unwrap();
}
let cur = Regex::new("(^\\.+)|(\\.+$)").unwrap().replace_all(&in_str, "");
let index_q = cur.chars().position(|c| c == '?');
let index_dot = cur.chars().position(|c| c == '.');
let index_hash = cur.chars().position(|c| c == '#');
if instructions.len() == 0 && index_q.is_none() && index_hash.is_none() {
return 1;
} else if instructions.len() == 0 && (index_q.unwrap_or(0) > 0 || index_hash.unwrap_or(0) > 0) {
return 0;
}
if index_q.unwrap_or(cur.len()) < index_dot.unwrap_or(cur.len()) {
let with_hash = cur.replacen("?", "#", 1);
let with_dot = cur.replacen("?", ".", 1);
let val_with_hash = count_valid(&with_hash, instructions, cache);
let val_with_dot = count_valid(&with_dot, instructions, cache);
cache.insert(cache_key(&with_hash, &instructions), val_with_hash);
cache.insert(cache_key(&with_dot, &instructions), val_with_dot);
return val_with_hash + val_with_dot;
} else {
if instructions.len() > 0 && index_dot.unwrap_or(cur.len()) == *instructions.first().unwrap() as usize {
let next_pos = index_dot.unwrap_or(cur.len()) + 1;
return count_valid(&cur.chars().skip(next_pos).collect::<String>(), &instructions[1..].to_vec(), cache);
} else {
return 0;
}
}
}
fn main() {
let start = Instant::now();
let input_orig = include_str!("../../input.txt").lines();
let mut inputs: Vec<Vec<&str>> = vec![];
let input = include_str!("../../input.txt").lines();
let mut result: i64 = 0;
let threads = input_orig.clone().count();
for i in 0..threads {
let lines = input_orig.clone().skip(i).step_by(threads).collect::<Vec<&str>>();
inputs.push(lines);
for line in input {
let mut cache: HashMap<String, i64> = HashMap::new();
// i fucking hate rusts lifetime garbage fuck this ownership garbage what is this
let mut parts = line.split(" ");
let field_in = parts.next().unwrap();
let field = format!("{field_in}?{field_in}?{field_in}?{field_in}?{field_in}");
let instructions_in = parts.next().unwrap();
let instructions_str = format!("{instructions_in},{instructions_in},{instructions_in},{instructions_in},{instructions_in}");
let instructions = instructions_str.split(",").map(|i| i.parse::<i32>().unwrap()).collect::<Vec<i32>>();
let res = count_valid(&field, &instructions, &mut cache);
println!("{res} - {field}");
result += res;
}
let mut handles: Vec<JoinHandle<i128>> = vec![];
for input in inputs {
let handle = thread::spawn(|| {
let thread_start = Instant::now();
let mut result = 0;
let regex = Regex::new("#+").unwrap();
for line in input {
let mut parts = line.split(" ");
// i fucking hate rust fuck this ownership garbage what is this
let field_in = parts.next().unwrap();
let field_str = format!("{field_in}?{field_in}?{field_in}?{field_in}?{field_in}");
let instructions_in = parts.next().unwrap();
let instructions_str = format!("{instructions_in},{instructions_in},{instructions_in},{instructions_in},{instructions_in}");
let field = field_str.split("").filter(|i| i.len() > 0).collect::<Vec<&str>>();
let instructions = instructions_str.split(",").map(|i| i.parse::<i128>().unwrap()).collect::<Vec<i128>>();
// println!("{:?} {:?}", field, instructions);
let unknown_count = field.iter().filter(|i| i == &&"?").count();
for i in 0..i128::pow(2, unknown_count as u32) {
let mut current_field = field.clone();
let mut pos = 0;
for (j, spring) in current_field.clone().iter().enumerate() {
if spring == &"?" {
current_field[j] = if i & 1 << pos > 0 { "#" } else { "." };
pos += 1;
}
}
let field_str = current_field.join("");
let pairs = regex
.find_iter(field_str.as_str())
.map(|m| m.as_str().len() as i128)
.collect::<Vec<i128>>();
if pairs.len() == instructions.len() && pairs.iter().zip(&instructions).filter(|(a, b)| a != b).count() == 0 {
result += 1;
}
}
}
println!("Thread result: {result} (Thread finished in {} seconds)", thread_start.elapsed().as_secs());
return result;
});
handles.push(handle);
}
let mut res = 0;
for handle in handles {
res += handle.join().unwrap();
}
println!("Final result: {} (After {} seconds)", res, start.elapsed().as_secs());
println!("Result: {result}");
}