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| 1 | +//! # Crossed Wires |
| 2 | +use crate::util::hash::*; |
| 3 | +use crate::util::parse::*; |
| 4 | + |
| 5 | +pub fn parse(input: &str) -> &str { |
| 6 | + input |
| 7 | +} |
| 8 | + |
| 9 | +pub fn part1(input: &str) -> u64 { |
| 10 | + let (prefix, suffix) = input.split_once("\n\n").unwrap(); |
| 11 | + |
| 12 | + let mut names = FastMap::new(); |
| 13 | + let mut cache = FastMap::new(); |
| 14 | + let mut ops = FastMap::new(); |
| 15 | + |
| 16 | + for line in prefix.lines() { |
| 17 | + let (key, value) = line.split_once(": ").unwrap(); |
| 18 | + |
| 19 | + let size = names.len(); |
| 20 | + let index = *names.entry(key).or_insert(size); |
| 21 | + |
| 22 | + cache.insert(index, value.unsigned::<u64>()); |
| 23 | + } |
| 24 | + |
| 25 | + for line in suffix.lines() { |
| 26 | + let tokens: Vec<_> = line.split(' ').collect(); |
| 27 | + let op = tokens[1]; |
| 28 | + |
| 29 | + let size = names.len(); |
| 30 | + let left = *names.entry(tokens[0]).or_insert(size); |
| 31 | + |
| 32 | + let size = names.len(); |
| 33 | + let right = *names.entry(tokens[2]).or_insert(size); |
| 34 | + |
| 35 | + let size = names.len(); |
| 36 | + let to = *names.entry(tokens[4]).or_insert(size); |
| 37 | + |
| 38 | + ops.insert(to, (left, op, right)); |
| 39 | + } |
| 40 | + |
| 41 | + let mut result = 0; |
| 42 | + |
| 43 | + for i in (0..64).rev() { |
| 44 | + let key = format!("z{i:02}"); |
| 45 | + if let Some(&key) = names.get(key.as_str()) { |
| 46 | + result = (result << 1) | helper(&mut cache, &mut ops, key); |
| 47 | + } |
| 48 | + } |
| 49 | + |
| 50 | + result |
| 51 | +} |
| 52 | + |
| 53 | +pub fn part2(_input: &str) -> String { |
| 54 | + // let (_, suffix) = input.split_once("\n\n").unwrap(); |
| 55 | + // let mut wires = FastMap::new(); |
| 56 | + |
| 57 | + // println!("digraph G {{"); |
| 58 | + |
| 59 | + // for i in 0..46 { |
| 60 | + // if i < 45 { |
| 61 | + // let key = format!("x{i:02}"); |
| 62 | + // println!(" {} [pos=\"{},{}!\"]", key, i * 2, 5); |
| 63 | + // let value = key.clone(); |
| 64 | + // wires.insert(key, vec![value]); |
| 65 | + |
| 66 | + // let key = format!("y{i:02}"); |
| 67 | + // println!(" {} [pos=\"{},{}!\"]", key, i * 2 + 1, 5); |
| 68 | + // let value = key.clone(); |
| 69 | + // wires.insert(key, vec![value]); |
| 70 | + // } |
| 71 | + |
| 72 | + // let key = format!("z{i:02}"); |
| 73 | + // println!(" {} [pos=\"{},{}!\"]", key, i * 2, 0); |
| 74 | + // } |
| 75 | + |
| 76 | + // println!(); |
| 77 | + |
| 78 | + // for (name, line) in suffix.lines().enumerate() { |
| 79 | + // let tokens: Vec<_> = line.split(' ').collect(); |
| 80 | + // let [_, _, _, _, to] = tokens[..] else { unreachable!() }; |
| 81 | + // wires.entry(String::from(to)).or_insert_with(Vec::new).push(format!("{name}")); |
| 82 | + // } |
| 83 | + |
| 84 | + // let mut second = FastMap::new(); |
| 85 | + |
| 86 | + // for (name, line) in suffix.lines().enumerate() { |
| 87 | + // let tokens: Vec<_> = line.split(' ').collect(); |
| 88 | + // let [left, op, right, _, to] = tokens[..] else { unreachable!() }; |
| 89 | + |
| 90 | + // let shape = match op { |
| 91 | + // "AND" => "square", |
| 92 | + // "OR" => "hexagon", |
| 93 | + // "XOR" => "triangle", |
| 94 | + // _ => unreachable!(), |
| 95 | + // }; |
| 96 | + |
| 97 | + // if left.starts_with('x') || right.starts_with('x') { |
| 98 | + // let i: usize = left.unsigned(); |
| 99 | + // if op == "AND" { |
| 100 | + // println!("{} [pos=\"{},{}!\"]", name, i * 2 + 1, 4); |
| 101 | + // second.insert(to, i); |
| 102 | + // } |
| 103 | + // if op == "XOR" { |
| 104 | + // println!("{} [pos=\"{},{}!\"]", name, i * 2, 4); |
| 105 | + // second.insert(to, i); |
| 106 | + // } |
| 107 | + // } |
| 108 | + // if to.starts_with('z') { |
| 109 | + // let i: usize = to.unsigned(); |
| 110 | + // println!("{} [pos=\"{},{}!\"]", name, i * 2, 1); |
| 111 | + // } |
| 112 | + |
| 113 | + // println!(" {name} [shape={shape}]"); |
| 114 | + // for edge in &wires[&String::from(left)] { |
| 115 | + // println!(" {edge} -> {name} [label=\"{left}\"]"); |
| 116 | + // } |
| 117 | + // for edge in &wires[&String::from(right)] { |
| 118 | + // println!(" {edge} -> {name} [label=\"{right}\"]"); |
| 119 | + // } |
| 120 | + // } |
| 121 | + |
| 122 | + // for (name, line) in suffix.lines().enumerate() { |
| 123 | + // let tokens: Vec<_> = line.split(' ').collect(); |
| 124 | + // let [left, op, right, _, _] = tokens[..] else { unreachable!() }; |
| 125 | + |
| 126 | + // if op == "AND" { |
| 127 | + // if let Some(i) = second.get(left) { |
| 128 | + // println!("{} [pos=\"{},{}!\"]", name, i * 2 + 1, 3); |
| 129 | + // } |
| 130 | + // if let Some(i) = second.get(right) { |
| 131 | + // println!("{} [pos=\"{},{}!\"]", name, i * 2 + 1, 3); |
| 132 | + // } |
| 133 | + // } |
| 134 | + // if op == "OR" { |
| 135 | + // if let Some(i) = second.get(left) { |
| 136 | + // println!("{} [pos=\"{},{}!\"]", name, i * 2 + 1, 2); |
| 137 | + // } |
| 138 | + // if let Some(i) = second.get(right) { |
| 139 | + // println!("{} [pos=\"{},{}!\"]", name, i * 2 + 1, 2); |
| 140 | + // } |
| 141 | + // } |
| 142 | + // } |
| 143 | + |
| 144 | + // for i in 0..46 { |
| 145 | + // let key = format!("z{i:02}"); |
| 146 | + // for edge in &wires[&key] { |
| 147 | + // println!(" {edge} -> {key}"); |
| 148 | + // } |
| 149 | + // } |
| 150 | + |
| 151 | + String::from("n/a") |
| 152 | +} |
| 153 | + |
| 154 | +fn helper( |
| 155 | + cache: &mut FastMap<usize, u64>, |
| 156 | + ops: &mut FastMap<usize, (usize, &str, usize)>, |
| 157 | + key: usize, |
| 158 | +) -> u64 { |
| 159 | + if let Some(&value) = cache.get(&key) { |
| 160 | + return value; |
| 161 | + } |
| 162 | + |
| 163 | + let (left, op, right) = ops[&key]; |
| 164 | + let left = helper(cache, ops, left); |
| 165 | + let right = helper(cache, ops, right); |
| 166 | + |
| 167 | + let value = match op { |
| 168 | + "AND" => left & right, |
| 169 | + "OR" => left | right, |
| 170 | + "XOR" => left ^ right, |
| 171 | + _ => unreachable!(), |
| 172 | + }; |
| 173 | + |
| 174 | + cache.insert(key, value); |
| 175 | + value |
| 176 | +} |
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