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|
fn parse(input: &str) -> Vec<String> {
input
.trim_end()
.split('\n')
.map(|x| {
let b = x.to_string();
let k = b.split(':').last().unwrap();
return k.trim().to_string();
})
.collect()
}
pub fn part1(input: &str) -> u32 {
let mut res: u32 = 0;
let cards: Vec<String> = parse(input);
for card in cards {
let numbers: Vec<String> = card.split('|').map(|x| x.trim().to_string()).collect();
assert_eq!(numbers.len(), 2);
let nums: Vec<Vec<_>> = numbers
.iter()
.map(|x| {
x.replace(" ", " ")
.split(' ')
.map(|x| x.trim().parse::<u32>().unwrap())
.collect()
})
.collect();
assert_eq!(nums.len(), 2);
let (winnings, plays) = (&nums[0], &nums[1]);
let mut k = 0.5;
for win in winnings {
if plays.contains(&win) {
k *= 2.;
}
}
res += k as u32;
}
res
}
//
//
//
// 1 -> 4 | x
// 2 -> 2 | y x
// 3 -> 2 | y y y x
// 4 -> 1 | y y y y y y y x
// 5 -> 0 | y y y y y y y y y y y y y x
// 6 -> 0 | x
//
//
pub fn part2(input: &str) -> u32 {
let mut res: u32 = 0;
let cards: Vec<String> = parse(input);
let mut incr: Vec<u32> = Vec::new();
incr.resize_with(cards.len(), Default::default);
let mut i = 0;
for card in cards {
let numbers: Vec<String> = card.split('|').map(|x| x.trim().to_string()).collect();
assert_eq!(numbers.len(), 2);
let nums: Vec<Vec<_>> = numbers
.iter()
.map(|x| {
x.replace(" ", " ")
.split(' ')
.map(|x| x.trim().parse::<u32>().unwrap())
.collect()
})
.collect();
assert_eq!(nums.len(), 2);
let (winnings, plays) = (&nums[0], &nums[1]);
let mut k = 0;
for win in winnings {
if plays.contains(&win) {
k += 1;
}
}
for j in (i + 1)..(i + 1 + k) {
incr[j] += 1 + incr[i];
}
res += 1 + incr[i];
i += 1;
}
res
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn example_part1() {
let input = include_str!("../example.txt");
let result = part1(input);
assert_eq!(result, 13);
}
#[test]
fn input_part1() {
let input = include_str!("../input.txt");
let result = part1(input);
assert_eq!(result, 25174);
}
#[test]
fn example_part2() {
let input = include_str!("../example.txt");
let result = part2(input);
assert_eq!(result, 30);
}
#[test]
fn input_part2() {
let input = include_str!("../input.txt");
let result = part2(input);
assert_eq!(result, 6420979);
}
}
|
