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2023-09: Solve part one

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Mathis 2023-12-20 22:56:04 +01:00
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11 23 35 47 68 121 242 469 810 1174 1267 538 -1522 -3962 -175 32404 155160 516078 1445918 3646814 8554127
12 31 55 84 119 162 217 289 378 465 487 298 -387 -2068 -5559 -12113 -23576 -42573 -72729 -118928 -187613
5 10 24 63 149 301 523 805 1182 1940 4122 10588 28057 70868 167736 373683 790775 1603530 3138176 5959697 11027249
13 27 47 88 180 375 760 1476 2743 4891 8397 13928 22390 34983 53262 79204 115281 164539 230683 318168 432296
15 23 38 79 183 415 878 1723 3159 5463 8990 14183 21583 31839 45718 64115 88063 118743 157494 205823 265415
19 33 49 63 72 74 68 54 33 7 -21 -47 -66 -72 -58 -16 63 189 373 627 964
28 56 106 191 341 631 1237 2540 5311 11025 22378 44141 84612 158160 289740 522859 933398 1653142 2909198 5089311 8849439
26 44 68 100 144 201 263 305 273 72 -421 -1233 -1812 450 14158 63440 209216 593632 1527766 3656462 8255164

3
input/2023/day_09/input_test.txt Normal file
View File

@ -0,0 +1,3 @@
0 3 6 9 12 15
1 3 6 10 15 21
10 13 16 21 30 45

9
src/utils/input_reader.rs
View File

@ -10,3 +10,12 @@ where
let file = File::open(filename)?;
Ok(io::BufReader::new(file).lines())
}
pub fn read_input_file<T>(input_path: &str, callback: T) -> String where T: Fn(Vec<String>) -> String {
if let Ok(lines) = read_lines(&input_path) {
let input_lines: Vec<String> = lines.map(|line| line.unwrap()).collect();
callback(input_lines)
} else {
panic!("Failed to read lines from input file");
}
}

23
src/year_2023/day_09_mirage_maintenance/mod.rs Normal file
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@ -0,0 +1,23 @@
pub mod part_one;
// pub mod part_two;
use crate::utils::solution::Solution;
use crate::utils::input_reader;
pub struct Day9Solution;
impl Solution for Day9Solution {
fn part_one(&self) -> String {
// Implementation for part one of day 1
// ...
input_reader::read_input_file("input/2023/day_09/input.txt", part_one::part_one)
}
fn part_two(&self) -> String {
// Implementation for part two of day 1
// ...
String::from("Not implemented")
// part_two::part_two()
}
}

34
src/year_2023/day_09_mirage_maintenance/part_one.rs Normal file
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@ -0,0 +1,34 @@
pub fn part_one(input_lines: Vec<String>) -> String {
let mut result: i32 = 0;
for line in input_lines {
let nums = parse_line(&line);
let mut last: Vec<i32> = Vec::new();
last.push(nums.last().unwrap().clone());
let mut diffs = get_differences(nums.clone());
last.push(diffs.last().unwrap().clone());
while !all_zeros(diffs.clone()) {
diffs = get_differences(diffs.clone());
last.push(diffs.last().unwrap().clone());
}
result += last.iter().sum::<i32>();
}
result.to_string()
}
fn parse_line(s: &str) -> Vec<i32> {
s.split_whitespace().map(|x| x.parse().unwrap()).collect()
}
fn get_differences(nums: Vec<i32>) -> Vec<i32> {
nums.windows(2).map(|w| w[1] - w[0]).collect()
}
fn all_zeros(nums: Vec<i32>) -> bool {
nums.iter().all(|&x| x == 0)
}

2
src/year_2023/mod.rs
View File

@ -6,6 +6,7 @@ pub mod day_03_gear_ratios;
pub mod day_04_scratchcards;
pub mod day_06_wait_for_it;
pub mod day_08_haunted_wasteland;
pub mod day_09_mirage_maintenance;
pub fn run(day: &str) {
let solution: Box<dyn Solution> = match day {
@ -15,6 +16,7 @@ pub fn run(day: &str) {
"4" => Box::new(day_04_scratchcards::Day4Solution),
"6" => Box::new(day_06_wait_for_it::Day6Solution),
"8" => Box::new(day_08_haunted_wasteland::Day8Solution),
"9" => Box::new(day_09_mirage_maintenance::Day9Solution),
_ => panic!("Invalid day specified"),
};