day 8 part 2 bruteforce attempt
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1 changed files with 26 additions and 2 deletions
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@ -2,7 +2,7 @@
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use aoc23::read;
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use chumsky::prelude::*;
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use std::collections::HashMap;
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use std::collections::{HashMap, HashSet};
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enum Instruction {
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Left,
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@ -85,7 +85,6 @@ fn parser() -> impl Parser<char, (Vec<Instruction>, Network), Error = Simple<cha
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fn main() -> anyhow::Result<()> {
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let (instructions, network) = read("inputs/day8.txt", parser())?;
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// eprintln!("{network:?}");
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let mut curr_node = "AAA";
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let mut i = 0;
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@ -100,5 +99,30 @@ fn main() -> anyhow::Result<()> {
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}
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println!("{steps}");
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let mut curr_nodes: HashSet<&str> = network
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.nodes
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.keys()
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.map(|node| node.as_str())
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.filter(|node| node.ends_with('A'))
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.collect();
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dbg!(curr_nodes.len());
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let mut i = 0;
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let mut steps = 0;
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while curr_nodes.iter().any(|node| !node.ends_with('Z')) {
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curr_nodes = curr_nodes
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.into_iter()
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.map(|node| match instructions[i] {
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Instruction::Left => network.left(node),
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Instruction::Right => network.right(node)
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})
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.collect();
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i = (i + 1) % instructions.len();
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steps += 1;
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if steps % 10000 == 0 {
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dbg!(steps);
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}
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}
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println!("{steps}");
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Ok(())
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}
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