add 2022/20/2

This commit is contained in:
kageru 2022-12-20 22:39:21 +01:00
parent 38b9ad928e
commit 0091045fb2
Signed by: kageru
GPG Key ID: 8282A2BEA4ADA3D2

@ -4,14 +4,14 @@ use aoc2022::{boilerplate, common::*};
use std::{collections::VecDeque, iter::repeat};
const DAY: usize = 20;
type Parsed = VecDeque<(isize, bool)>;
type Parsed = Vec<isize>;
fn parse_input(raw: &str) -> Parsed {
raw.lines().map(|l| l.parse().unwrap()).zip(repeat(false)).collect()
raw.lines().map(|l| l.parse().unwrap()).collect()
}
fn part1(parsed: &Parsed) -> isize {
let mut xs = parsed.to_owned();
let mut xs: VecDeque<_> = parsed.iter().copied().zip(repeat(false)).collect();
let mut moved = 0;
while moved < parsed.len() {
let x = xs.pop_front().unwrap();
@ -33,8 +33,32 @@ fn part1(parsed: &Parsed) -> isize {
a + b + c
}
fn part2(parsed: &Parsed) -> usize {
unimplemented!()
const DECRYPTION_KEY: isize = 811589153;
fn part2(parsed: &Parsed) -> isize {
let mut xs: VecDeque<_> = parsed.iter().enumerate().map(|(p, x)| (p, x * DECRYPTION_KEY)).collect();
for i in 0..10 {
dbg!(i, &xs);
let mut moved = 0;
while moved < parsed.len() {
let i = xs.iter().position(|(x, _)| x == &moved).unwrap();
xs.rotate_left(i);
let x = xs.pop_front().unwrap();
let idx = ((x.1 + (xs.len() * 2 * DECRYPTION_KEY as usize) as isize) % xs.len() as isize) as usize;
dbg!("Inserting at", idx);
xs.insert(idx, x);
moved += 1;
}
}
let i = xs.iter().position(|(_, x)| x == &0).unwrap();
xs.rotate_left(i);
xs.rotate_left(1000 % parsed.len());
let a = xs.front().unwrap().1;
xs.rotate_left(1000 % parsed.len());
let b = xs.front().unwrap().1;
xs.rotate_left(1000 % parsed.len());
let c = xs.front().unwrap().1;
a + b + c
}
boilerplate! {
@ -47,9 +71,9 @@ boilerplate! {
4",
tests: {
part1: { TEST_INPUT => 3 },
part2: { TEST_INPUT => 0 },
part2: { TEST_INPUT => 1623178306 },
},
bench1 == 23321,
bench2 == 0,
bench_parse: VecDeque::len => 5000,
bench2 == 1428396909280,
bench_parse: Vec::len => 5000,
}