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Complete day 4

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Tyler Hallada 2021-12-06 01:05:21 -05:00
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8
Cargo.lock generated
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@ -36,6 +36,14 @@ dependencies = [
"common", "common",
] ]
[[package]]
name = "day04"
version = "0.1.0"
dependencies = [
"anyhow",
"common",
]
[[package]] [[package]]
name = "day06" name = "day06"
version = "0.1.0" version = "0.1.0"

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crates/day04/Cargo.toml Normal file
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@ -0,0 +1,10 @@
[package]
name = "day04"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
anyhow = "1.0"
common = { path = "../common" }

601
crates/day04/src/input/input.txt Normal file
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19
crates/day04/src/input/test.txt Normal file
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@ -0,0 +1,19 @@
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
22 13 17 11 0
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20 11 10 24 4
14 21 16 12 6
14 21 17 24 4
10 16 15 9 19
18 8 23 26 20
22 11 13 6 5
2 0 12 3 7

165
crates/day04/src/main.rs Normal file
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@ -0,0 +1,165 @@
use anyhow::{anyhow, Error, Result};
use common::instrument;
use std::collections::HashMap;
use std::str::FromStr;
const INPUT: &str = include_str!("input/input.txt");
#[derive(Debug, Clone, Copy)]
enum BoardNum {
Marked(u8),
Unmarked(u8),
}
#[derive(Debug)]
struct Board {
board: [[BoardNum; 5]; 5],
marked_cols: HashMap<usize, u8>,
marked_rows: HashMap<usize, u8>,
}
impl FromStr for Board {
type Err = Error;
fn from_str(s: &str) -> Result<Self> {
let mut board = [[BoardNum::Unmarked(0); 5]; 5];
for (y, line) in s.lines().enumerate() {
for (x, num) in line.trim().split_whitespace().enumerate() {
board[y][x] = BoardNum::Unmarked(num.parse()?);
}
}
Ok(Self {
board,
marked_cols: HashMap::new(),
marked_rows: HashMap::new(),
})
}
}
impl Board {
fn draw(&mut self, drawn_num: u8) {
for row in 0..5 {
for col in 0..5 {
if let BoardNum::Unmarked(num) = self.board[row][col] {
if num == drawn_num {
self.board[row][col] = BoardNum::Marked(num);
let row_count = self.marked_rows.entry(row).or_insert(0);
*row_count += 1;
let col_count = self.marked_cols.entry(col).or_insert(0);
*col_count += 1;
}
}
}
}
}
fn is_win(&self) -> bool {
if self.marked_rows.values().any(|&count| count == 5)
|| self.marked_cols.values().any(|&count| count == 5)
{
return true;
}
false
}
fn score(&self) -> u32 {
let mut score = 0;
for row in 0..5 {
for col in 0..5 {
if let BoardNum::Unmarked(num) = self.board[row][col] {
score += num as u32;
}
}
}
score
}
}
fn solve_part1(input: &str) -> Result<u32> {
let mut groups = input.trim().split("\n\n");
let draws = groups
.next()
.unwrap()
.split(',')
.map(|s| s.parse::<u8>())
.collect::<Result<Vec<_>, std::num::ParseIntError>>()?;
let mut boards: Vec<Board> = vec![];
for group in groups {
boards.push(Board::from_str(group)?);
}
for draw in draws {
for board in &mut boards {
board.draw(draw);
if board.is_win() {
return Ok(board.score() * draw as u32);
}
}
}
Err(anyhow!("No winning board found"))
}
fn solve_part2(input: &str) -> Result<u32> {
let mut groups = input.trim().split("\n\n");
let draws = groups
.next()
.unwrap()
.split(',')
.map(|s| s.parse::<u8>())
.collect::<Result<Vec<_>, std::num::ParseIntError>>()?;
let mut boards: Vec<Board> = vec![];
for group in groups {
boards.push(Board::from_str(group)?);
}
for draw in draws {
if boards.len() == 1 {
boards[0].draw(draw);
if boards[0].is_win() {
return Ok(boards[0].score() * draw as u32);
}
} else {
for board in &mut boards {
board.draw(draw);
}
boards.retain(|board| {
if board.is_win() {
return false;
}
return true;
});
}
}
Err(anyhow!("No winning board found"))
}
fn main() {
instrument!(solve_part1(INPUT).unwrap(), solve_part2(INPUT).unwrap());
}
#[cfg(test)]
mod tests {
use super::*;
const TEST_INPUT: &str = include_str!("input/test.txt");
#[test]
fn solves_part1() {
assert_eq!(solve_part1(TEST_INPUT).unwrap(), 4512);
}
#[test]
fn solves_part2() {
assert_eq!(solve_part2(TEST_INPUT).unwrap(), 1924);
}
}