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Added Day 4 Part 1

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day8-work 4.1
Ishan Jain 1 year ago
parent 4d7deb7de3
commit e79094fc00
3 changed files with 716 additions and 60 deletions
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20
inputs/day4.sample.txt
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7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
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inputs/day4.txt
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50,68,2,1,69,32,87,10,31,21,78,23,62,98,16,99,65,35,27,96,66,26,74,72,45,52,81,60,38,57,54,19,18,77,71,29,51,41,22,6,58,5,42,92,85,64,94,12,83,11,17,14,37,36,59,33,0,93,34,70,97,7,76,20,3,88,43,47,8,79,80,63,9,25,56,75,15,4,82,67,39,30,89,86,46,90,48,73,91,55,95,28,49,61,44,84,40,53,13,24
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154
src/main.rs
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extern crate test;
const INPUTS: [&'static str; 2] = [
include_str!("../inputs/day3.sample.txt"),
include_str!("../inputs/day3.txt"),
include_str!("../inputs/day4.sample.txt"),
include_str!("../inputs/day4.txt"),
];
fn cmds(input: &'static str) -> Vec<u64> {
input
.lines()
.filter(|&x| !x.is_empty())
.map(|x| u64::from_str_radix(x, 2).unwrap())
.collect()
#[derive(Copy, Clone, Debug)]
enum BoardEntry {
Entry(u64),
CalledEntry(u64),
Null,
}
fn solution<const MAX_LENGTH: usize>(levels: Vec<u64>) -> u64 {
let oxygen_gen_rating = filter_candidates::<MAX_LENGTH>(levels.clone(), true);
let co2_scrub_rating = filter_candidates::<MAX_LENGTH>(levels, false);
oxygen_gen_rating * co2_scrub_rating
#[derive(Copy, Clone, Debug)]
struct Board {
board: [[BoardEntry; 5]; 5],
sum: u64,
}
fn filter_candidates<const MAX_LENGTH: usize>(mut levels: Vec<u64>, dominant: bool) -> u64 {
let mut i = 0;
while levels.len() > 1 {
let count = count_bits::<MAX_LENGTH>(&levels, dominant);
let leading = count & (1 << (MAX_LENGTH - i - 1));
fn cmds(input: &'static str) -> (Vec<u64>, Vec<Board>) {
let mut lines = input.split("\n\n").filter(|x| !x.is_empty());
let draws: Vec<u64> = lines
.next()
.unwrap()
.split(',')
.map(|x| x.parse::<u64>().unwrap())
.collect();
let mut boards = vec![];
for block in lines {
let mut bblock = Board {
board: [[BoardEntry::Null; 5]; 5],
sum: 0,
};
for (i, line) in block.split('\n').enumerate() {
for (j, c) in line.split(' ').filter(|x| !x.is_empty()).enumerate() {
let num = c.parse::<u64>().unwrap();
bblock.board[i][j] = BoardEntry::Entry(num);
bblock.sum += num;
}
}
boards.push(bblock)
}
(draws, boards)
}
levels = levels
.into_iter()
.filter(|&x| {
let pos = x & (1 << (MAX_LENGTH - i - 1));
fn solution((draws, mut boards): (Vec<u64>, Vec<Board>)) -> u64 {
for draw in draws {
// Mark boards
return pos == leading;
})
.collect();
mark_entry(&mut boards, draw);
i += 1;
if let Some(board) = check_winner(&boards) {
return board.sum * draw;
}
}
levels[0]
0
}
fn count_bits<const MAX_LENGTH: usize>(levels: &[u64], dominant: bool) -> u64 {
let n = levels.len();
let mut count = [0; MAX_LENGTH];
let mut mask = 0;
fn check_winner(boards: &[Board]) -> Option<&Board> {
for board in boards {
let grid = board.board;
for &level in levels.iter() {
for i in 0..MAX_LENGTH {
let c = level & (1 << (MAX_LENGTH - i - 1));
if c != 0 {
count[i as usize] += 1;
for i in 0..5 {
if grid[i]
.iter()
.all(|x| matches!(x, BoardEntry::CalledEntry(_)))
{
return Some(board);
}
}
}
for (i, c) in count.into_iter().enumerate() {
if c >= n - c {
mask |= 1 << (MAX_LENGTH - i - 1);
for j in 0..5 {
let mut all_called = true;
for i in 0..5 {
if !matches!(grid[i][j], BoardEntry::CalledEntry(_)) {
all_called = false;
break;
}
}
if all_called {
return Some(board);
}
}
}
if dominant {
mask
} else {
!mask
None
}
fn mark_entry(boards: &mut [Board], called: u64) {
for board in boards {
for row in board.board.iter_mut() {
for col in row.iter_mut() {
if let BoardEntry::Entry(val) = col {
if *val == called {
board.sum -= *val;
*col = BoardEntry::CalledEntry(*val);
}
}
}
}
}
}
fn main() {
let moves = cmds(INPUTS[0]);
let count = solution::<5>(moves);
println!("Result {}", count);
let moves = cmds(INPUTS[1]);
let count = solution::<12>(moves);
println!("Result {}", count);
for input in INPUTS {
let input = cmds(input);
let result = solution(input);
println!("Result {}", result);
}
}
#[bench]
fn solution_bench(b: &mut test::Bencher) {
let moves = cmds(INPUTS[1]);
b.iter(|| {
let v = solution::<12>(moves.clone());
test::black_box(v);
let input = cmds(INPUTS[1]);
let result = solution(input);
test::black_box(result);
})
}
#[test]
fn solution_test() {
assert_eq!(solution::<5>(cmds(INPUTS[0])), 230);
assert_eq!(solution::<12>(cmds(INPUTS[1])), 4406844);
}

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