advent-of-code/2021/src/bin/day21.rs

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#![feature(test)]
extern crate test;
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use itertools::Itertools;
type Parsed = (u16, u16);
const INPUT: Parsed = (7, 3);
fn part1((p1, p2): Parsed) -> usize {
(1..=100)
.cycle()
.tuples()
.enumerate()
.inspect(|x| println!("raw: {x:?}"))
.scan([(p1, 0), (p2, 0)], |mut scores, (round, (_, die, _))| {
let mut points = (scores[round & 1].0 + die * 3) % 10;
if points == 0 {
points = 10;
}
println!("Player {} moves {} for {points}", round & 1, die * 3);
scores[round & 1].0 = points;
scores[round & 1].1 += points;
Some((round, *scores))
})
.inspect(|x| println!("res: {x:?}"))
.find_map(|(r, [(_, s1), (_, s2)])| (s1 >= 1000 || s2 >= 1000).then(|| (r + 1) * 3 * (s1.min(s2) as usize)))
.unwrap()
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}
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fn part2((p1, p2): Parsed) -> usize {
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unimplemented!()
}
fn main() {
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println!("Part 1: {}", part1(INPUT));
println!("Part 2: {}", part2(INPUT));
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}
#[cfg(test)]
mod tests {
use super::*;
use aoc2021::*;
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#[test]
fn part1_test() {
assert_eq!(part1((4, 8)), 739785);
}
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}