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2) * 2 * 5 + ((4 * 2 * 7 + 8 + 7) + 7 + 6 * 4 * 3 * 6) +(7 + 3 * 6 * (2 * 7) + 7 * 8) * 7 * 2 + 4 + 5 * 2 +(6 * 2 * 5) + (7 + 7) * 9 * 5 * 2 * 5 +3 * (8 + 3 * 3 * 2) + 5 + (9 * (5 + 8 * 8 * 5 + 8) * 4 + 7 * 8 + 3) diff --git a/2020/src/bin/day18.rs b/2020/src/bin/day18.rs new file mode 100644 index 0000000..72ad327 --- /dev/null +++ b/2020/src/bin/day18.rs @@ -0,0 +1,105 @@ +#![feature(test)] +extern crate test; +use aoc2020::common::*; +use itertools::Itertools; + +type Parsed = Vec>; + +#[derive(Debug, Copy, Clone, PartialEq)] +enum Operation { + Number(usize), + Multiply, + Add, + OpenParen, + CloseParen, +} + +fn read_input() -> String { + read_file(18) +} + +fn parse_input(raw: &str) -> Parsed { + raw.lines() + .map(|l| { + l.bytes() + .filter(|&b| b != b' ') + .map(|op| match op { + b'+' => Operation::Add, + b'*' => Operation::Multiply, + b'(' => Operation::OpenParen, + b')' => Operation::CloseParen, + n => Operation::Number((n - 48) as usize), + }) + .collect() + }) + .collect() +} + +fn part1(parsed: &Parsed) -> usize { + parsed.iter().map(|l| p1_rec(l)).sum() +} + +fn p1_rec(ops: &[Operation]) -> usize { + // dbg!(ops); + let mut stack = vec![]; + let mut parens = 0; + for i in 0..ops.len() { + match ops[i] { + Operation::OpenParen if parens > 0 => { + parens += 1; + } + Operation::CloseParen if parens > 0 => { + parens -= 1; + } + _ if parens > 0 => continue, + Operation::Add => stack.push(ops[i]), + Operation::Multiply => stack.push(ops[i]), + Operation::Number(n) => stack.push(Operation::Number(n)), + Operation::OpenParen => { + stack.push(Operation::Number(p1_rec(&ops[i + 1..]))); + parens += 1; + } + Operation::CloseParen => break, + } + while stack.len() > 2 { + let drained = stack.drain(..3).collect_vec(); + // dbg!(&drained, parens); + match drained[..] { + [Operation::Number(x), Operation::Add, Operation::Number(y)] => stack.push(Operation::Number(x + y)), + [Operation::Number(x), Operation::Multiply, Operation::Number(y)] => stack.push(Operation::Number(x * y)), + _ => unreachable!("Invalid stack: {:?} of size {}", drained, drained.len()), + } + } + } + if let Operation::Number(n) = stack[0] { + n + } else { + unreachable!() + } +} + +fn part2(parsed: &Parsed) -> usize { + unimplemented!() +} + +fn main() { + let input = parse_input(&read_input()); + println!("Part 1: {}", part1(&input)); + println!("Part 2: {}", part2(&input)); +} + +#[cfg(test)] +mod tests { + use super::*; + use aoc2020::*; + use paste::paste; + use test::black_box; + + const TEST_INPUT: &str = "((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2"; + + test!(part1() == 13632); + //test!(part2() == 0); + //bench!(part1() == 0); + //bench!(part2() == 0); + //bench_input!(len == 0); +}