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25
9/Cargo.lock generated
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@ -1,25 +0,0 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "day9"
version = "0.1.0"
dependencies = [
"itertools",
]
[[package]]
name = "either"
version = "1.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
[[package]]
name = "itertools"
version = "0.12.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "25db6b064527c5d482d0423354fcd07a89a2dfe07b67892e62411946db7f07b0"
dependencies = [
"either",
]

9
9/Cargo.toml
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@ -1,9 +0,0 @@
[package]
name = "day9"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
itertools = "0.12.0"

200
9/input
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13 25 45 80 128 176 209 245 427 1232 3904 11298 29466 70580 158268 337300 691065 1372831 2660967 5054944 9439092
12 27 56 109 217 450 952 2016 4237 8811 18102 36684 73186 143428 275536 517963 951618 1707611 2992452 5122887 8572903
11 9 18 50 123 268 550 1128 2407 5389 12427 28744 65328 144230 308068 637127 1280826 2517520 4871558 9346510 17891302
21 38 67 119 209 358 602 1007 1685 2817 4726 8115 14700 28634 59344 126700 269817 561276 1129161 2190075 4097255
20 42 87 173 334 639 1220 2307 4268 7652 13233 22053 35462 55153 83190 122027 174516 243902 333803 448173 591246
-8 -17 -31 -55 -87 -106 -57 174 807 2254 5266 11168 22214 42099 76670 134883 230058 381489 616471 972811 1501895
0 7 34 95 211 424 819 1555 2919 5449 10239 19663 38964 79482 164782 341635 698754 1397451 2720024 5143775 9451177
19 26 34 59 144 369 871 1896 3913 7829 15369 29767 57136 109398 210718 411416 816946 1645551 3337551 6752638 13509007
17 28 54 109 207 362 588 899 1309 1832 2482 3273 4219 5334 6632 8127 9833 11764 13934 16357 19047
17 24 43 87 168 300 509 860 1528 2974 6339 14232 32144 70737 149186 299524 571463 1036320 1787319 2931489 4565420
0 8 33 87 192 392 779 1532 2965 5579 10114 17600 29411 47333 73666 111391 164446 238170 339991 480453 674698
-10 -13 -4 36 137 338 676 1159 1720 2174 2272 2106 3430 13019 50131 161667 451022 1130269 2610728 5654808 11623123
12 27 59 121 226 387 617 929 1336 1851 2487 3257 4174 5251 6501 7937 9572 11419 13491 15801 18362
-6 5 43 135 328 690 1307 2277 3702 5679 8291 11599 15636 20404 25875 31997 38706 45945 53691 61991 71008
-4 -10 -24 -54 -111 -209 -365 -599 -934 -1396 -2014 -2820 -3849 -5139 -6731 -8669 -11000 -13774 -17044 -20866 -25299
14 13 10 15 48 152 421 1050 2418 5219 10660 20749 38700 69486 120575 202888 332022 529785 826094 1261291 1888936
13 32 68 142 287 548 982 1658 2657 4072 6008 8582 11923 16172 21482 28018 35957 45488 56812 70142 85703
-5 0 15 47 113 262 609 1386 3024 6296 12579 24342 46049 85805 158353 290736 533880 988511 1866498 3637488 7371468
4 4 8 16 28 44 64 88 116 148 184 224 268 316 368 424 484 548 616 688 764
3 5 9 15 23 33 45 59 75 93 113 135 159 185 213 243 275 309 345 383 423
8 23 45 76 121 182 252 312 334 293 191 96 199 892 2870 7260 15780 30931 56225 96452 157989

113
9/src/main.rs
View File

@ -1,113 +0,0 @@
use std::fs::File;
use std::io::{BufRead, BufReader, Lines};
use itertools::Itertools;
// BOILERPLATE
type InputIter = Lines<BufReader<File>>;
fn get_input() -> InputIter {
let f = File::open("input").unwrap();
let br = BufReader::new(f);
br.lines()
}
fn main() {
println!("Problem 1 solution: {}", problem1(get_input()));
println!("Problem 2 solution: {}", problem2(get_input()));
}
// PARSE
#[derive(Debug)]
struct History(Vec<Vec<i64>>);
impl From<&str> for History {
fn from(s: &str) -> Self {
let hist: Vec<i64> = s
.split_whitespace()
.map(|num| num.parse().unwrap())
.collect();
Self(vec![hist])
}
}
impl History {
fn build_row(&mut self) {
let last = self.0.last().unwrap();
self.0.push(
last.iter()
.tuple_windows()
.map(|(a, b)| b - a)
.collect(),
)
}
fn build(&mut self) {
while !self.0.last().unwrap().iter().all(|x| *x == 0) {
self.build_row();
}
}
fn extrapolate(&mut self) {
self.build();
self.0.last_mut().unwrap().push(0);
for (lower, upper) in (0..self.0.len()).rev().tuple_windows() {
let new_value = self.0[upper].last().unwrap() + self.0[lower].last().unwrap();
self.0[upper].push(new_value);
}
}
fn extrapolate2(&mut self) {
self.build();
self.0.last_mut().unwrap().insert(0, 0);
for (lower, upper) in (0..self.0.len()).rev().tuple_windows() {
let new_value = self.0[upper].first().unwrap() - self.0[lower].first().unwrap();
self.0[upper].insert(0, new_value);
}
}
}
// PROBLEM 1 solution
fn problem1<T: BufRead>(input: Lines<T>) -> i64 {
let mut histories: Vec<History> = input.map(|s| History::from(s.unwrap().as_str())).collect();
for history in &mut histories {
history.extrapolate();
}
histories.iter().map(|history| history.0.first().unwrap().last().unwrap()).sum()
}
// PROBLEM 2 solution
fn problem2<T: BufRead>(input: Lines<T>) -> i64 {
let mut histories: Vec<History> = input.map(|s| History::from(s.unwrap().as_str())).collect();
for history in &mut histories {
history.extrapolate2();
}
histories.iter().map(|history| history.0.first().unwrap().first().unwrap()).sum()
}
#[cfg(test)]
mod tests {
use crate::*;
use std::io::Cursor;
const EXAMPLE: &str = &"0 3 6 9 12 15
1 3 6 10 15 21
10 13 16 21 30 45";
#[test]
fn problem1_example() {
let c = Cursor::new(EXAMPLE);
assert_eq!(problem1(c.lines()), 114);
}
#[test]
fn problem2_example() {
let c = Cursor::new(EXAMPLE);
assert_eq!(problem2(c.lines()), 2);
}
}