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Day 4

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Zoé Cassiopée Gauthier 2021-12-04 15:43:49 -05:00
parent 79da3ab4aa
commit 40f2821ee8
3 changed files with 731 additions and 0 deletions
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4
Cargo.toml
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@ -14,3 +14,7 @@ path = "src/day2.rs"
[[bin]] [[bin]]
name = "day3" name = "day3"
path = "src/day3.rs" path = "src/day3.rs"
[[bin]]
name = "day4"
path = "src/day4.rs"

601
inputs/day4.txt Normal file
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@ -0,0 +1,601 @@
25,8,32,53,22,94,55,80,33,4,63,14,60,95,31,89,30,5,47,66,84,70,17,74,99,82,21,35,64,2,76,9,90,56,78,28,51,86,49,98,29,96,23,58,52,75,41,50,13,72,92,83,62,37,18,11,34,71,91,85,27,12,24,73,7,77,10,93,15,61,3,46,16,97,1,57,65,40,0,48,69,6,20,68,19,45,42,79,88,44,26,38,36,54,81,59,43,87,39,67
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55 98 79 85 3

126
src/day4.rs Normal file
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@ -0,0 +1,126 @@
use std::num::ParseIntError;
use std::str::FromStr;
struct Square {
number: u8,
marked: bool,
}
struct Board {
grid: Vec<Vec<Square>>,
}
impl Board {
fn mark<'a>(&'a mut self, number: u8) {
for row in self.grid.iter_mut() {
match row.iter_mut().find(|square| square.number == number) {
Some(square) => {
square.marked = true;
}
None => {}
}
}
}
fn is_winning(&self) -> bool {
for row in self.grid.iter() {
if row.iter().all(|s| s.marked) {
return true;
}
}
for col in 0..5 {
if self.grid.iter().all(|row| row[col].marked) {
return true;
}
}
false
}
fn score(&self) -> u32 {
self.grid.iter().fold(0u32, |acc, row| {
acc + row
.iter()
.map(|s| if s.marked { 0 } else { s.number as u32 })
.sum::<u32>()
})
}
}
impl FromStr for Board {
type Err = ParseIntError;
fn from_str(s: &str) -> Result<Board, Self::Err> {
let grid = s
.lines()
.map(|line| {
line.split_whitespace()
.map(|s| Square {
number: s.parse().unwrap(),
marked: false,
})
.collect()
})
.collect::<Vec<Vec<Square>>>();
Ok(Board { grid: grid })
}
}
fn main() {
const INPUT: &'static str = include_str!("../inputs/day4.txt");
solve_part1(INPUT);
solve_part2(INPUT);
}
fn solve_part1(input: &str) {
let mut blocks = input.split("\n\n");
let drawn_numbers = blocks
.next()
.unwrap()
.split(',')
.map(|n| n.parse().unwrap());
let mut boards: Vec<Board> = blocks.map(|b| b.parse().unwrap()).collect();
for number in drawn_numbers {
for board in boards.iter_mut() {
board.mark(number);
if board.is_winning() {
println!(
"board wins after number {}, score {}",
number,
board.score()
);
println!("solution {}", board.score() * number as u32);
return;
}
}
}
}
fn solve_part2(input: &str) {
let mut blocks = input.split("\n\n");
let drawn_numbers = blocks
.next()
.unwrap()
.split(',')
.map(|n| n.parse().unwrap());
let mut boards: Vec<Board> = blocks.map(|b| b.parse().unwrap()).collect();
let mut winning_boards = vec![false; boards.len()];
for number in drawn_numbers {
for (i, board) in boards.iter_mut().enumerate() {
board.mark(number);
if board.is_winning() {
winning_boards[i] = true;
}
if winning_boards.iter().all(|b| *b) {
println!(
"board wins after number {}, score {}",
number,
board.score()
);
println!("solution {}", board.score() * number as u32);
return;
}
}
}
}