day 8 part 2 bruteforce attempt

This commit is contained in:
Dominic 2023-12-08 21:28:36 +01:00
parent 5cc33ed979
commit 1c8b2b3179
Signed by: msrd0
GPG key ID: DCC8C247452E98F9

View file

@ -2,7 +2,7 @@
use aoc23::read;
use chumsky::prelude::*;
use std::collections::HashMap;
use std::collections::{HashMap, HashSet};
enum Instruction {
Left,
@ -85,7 +85,6 @@ fn parser() -> impl Parser<char, (Vec<Instruction>, Network), Error = Simple<cha
fn main() -> anyhow::Result<()> {
let (instructions, network) = read("inputs/day8.txt", parser())?;
// eprintln!("{network:?}");
let mut curr_node = "AAA";
let mut i = 0;
@ -100,5 +99,30 @@ fn main() -> anyhow::Result<()> {
}
println!("{steps}");
let mut curr_nodes: HashSet<&str> = network
.nodes
.keys()
.map(|node| node.as_str())
.filter(|node| node.ends_with('A'))
.collect();
dbg!(curr_nodes.len());
let mut i = 0;
let mut steps = 0;
while curr_nodes.iter().any(|node| !node.ends_with('Z')) {
curr_nodes = curr_nodes
.into_iter()
.map(|node| match instructions[i] {
Instruction::Left => network.left(node),
Instruction::Right => network.right(node)
})
.collect();
i = (i + 1) % instructions.len();
steps += 1;
if steps % 10000 == 0 {
dbg!(steps);
}
}
println!("{steps}");
Ok(())
}