rewrote day4

This commit is contained in:
Andrew Glaze 2023-12-14 11:03:55 -05:00
parent 51c64d827b
commit 39633cc659

View File

@ -1,17 +1,72 @@
use aoc_runner_derive::{aoc, aoc_generator};
use std::collections::VecDeque;
#[aoc_generator(day4)]
fn parse(input: &str) -> String {
todo!()
fn parse(input: &str) -> Vec<Vec<Vec<i32>>> {
let input: Vec<Vec<Vec<i32>>> = input.lines()
.map(|card| &card[(card.find(':').unwrap() + 1)..])
.map(|card| card.trim())
.map(|card| {
card.split('|')
.map(|numbers| {
numbers.split_whitespace()
.map(|num| num.parse::<i32>().unwrap())
.collect::<Vec<_>>()
}).collect::<Vec<_>>()
}).collect::<Vec<_>>();
input
}
#[aoc(day4, part1)]
fn part1(input: &str) -> String {
todo!()
fn part1(input: &Vec<Vec<Vec<i32>>>) -> i32 {
let mut total_pts = 0;
for card in input {
let mut card_pts = 0;
let winning = card.first().unwrap();
let ours = card.last().unwrap();
for num in ours {
if winning.contains(num) {
if card_pts == 0 {
card_pts = 1;
} else {
card_pts *= 2;
}
}
}
total_pts += card_pts;
}
total_pts
}
#[aoc(day4, part2)]
fn part2(input: &str) -> String {
todo!()
fn part2(input: &Vec<Vec<Vec<i32>>>) -> i32 {
let mut queue = VecDeque::from((0..input.len()).collect::<Vec<usize>>());
let mut total_cards = 0;
while !queue.is_empty() {
let card_num = queue.pop_front().unwrap();
let card = input.get(card_num).unwrap();
total_cards += 1;
let mut dup_cards = 0;
let winning_nums = card.first().unwrap();
let our_nums = card.last().unwrap();
for num in our_nums {
if winning_nums.contains(num) {
dup_cards += 1;
}
}
for card in (card_num + 1)..=(card_num + dup_cards) {
if card < input.len() {
queue.push_back(card);
}
}
}
total_cards
}
@ -19,13 +74,20 @@ fn part2(input: &str) -> String {
mod tests {
use super::*;
const EX: &str = r"Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53
Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1
Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83
Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11";
#[test]
fn part1_example() {
assert_eq!(part1(&parse("<EXAMPLE>")), "<RESULT>");
assert_eq!(part1(&parse(EX)), 13);
}
#[test]
fn part2_example() {
assert_eq!(part2(&parse("<EXAMPLE>")), "<RESULT>");
assert_eq!(part2(&parse(EX)), 30);
}
}