day 8 part 2 bruteforce attempt

src/bin/day8.rs

@@ -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(())
 }