Complete day 9
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49670FD774E43268
1
day-9/.gitignore
vendored
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1
day-9/.gitignore
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/target/
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94
day-9/Cargo.lock
generated
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94
day-9/Cargo.lock
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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[[package]]
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name = "day-9"
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version = "0.1.0"
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dependencies = [
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"indoc",
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"itertools",
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]
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[[package]]
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name = "either"
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version = "1.6.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
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[[package]]
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name = "indoc"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
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dependencies = [
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"indoc-impl",
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"proc-macro-hack",
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]
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[[package]]
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name = "indoc-impl"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
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dependencies = [
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"proc-macro-hack",
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"proc-macro2",
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"quote",
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"syn",
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"unindent",
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]
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[[package]]
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name = "itertools"
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version = "0.9.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b"
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dependencies = [
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"either",
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]
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[[package]]
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name = "proc-macro-hack"
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version = "0.5.19"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
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[[package]]
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name = "proc-macro2"
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version = "1.0.24"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
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dependencies = [
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"unicode-xid",
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]
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[[package]]
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name = "quote"
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version = "1.0.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "syn"
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version = "1.0.54"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-xid",
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]
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[[package]]
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name = "unicode-xid"
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
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[[package]]
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name = "unindent"
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version = "0.1.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"
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11
day-9/Cargo.toml
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11
day-9/Cargo.toml
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@ -0,0 +1,11 @@
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[package]
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name = "day-9"
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version = "0.1.0"
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authors = ["Tristan Daniël Maat <tm@tlater.net>"]
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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indoc = "0.3"
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itertools = "0.9"
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1000
day-9/input
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1000
day-9/input
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File diff suppressed because it is too large
Load diff
134
day-9/src/main.rs
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134
day-9/src/main.rs
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use std::fs;
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use std::num::ParseIntError;
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use itertools::{Itertools, MinMaxResult};
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let input = fs::read_to_string("input")?;
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let xmas = parse_xmas(&input)?;
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// Part 1
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let result = find_not_summed(&xmas, 25)?;
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println!("{}", result);
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// Part 2
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let result = find_weakness(&xmas, result)?;
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println!("{}", result);
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Ok(())
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}
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fn parse_xmas(input: &str) -> Result<Vec<u64>, ParseIntError> {
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input.lines().map(|line| line.parse()).collect()
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}
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fn find_weakness(xmas: &Vec<u64>, key: u64) -> Result<u64, &str> {
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// Now we use the key to find the weakness, by getting all
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// possible sub-sumbs of the list of numbers, and finding the one
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// that happens to match our key
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let weak_window = (2..xmas.len())
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.find_map(|window_size| {
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xmas.windows(window_size)
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.find(|window| window.iter().sum::<u64>() == key)
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})
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.ok_or("Could not find a weakness")?;
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if let MinMaxResult::MinMax(min, max) = weak_window.iter().minmax() {
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Ok(min + max)
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} else {
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unreachable!("We must have at least two elements due to the window size")
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}
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}
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fn find_not_summed(xmas: &Vec<u64>, window_size: usize) -> Result<u64, &str> {
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xmas.windows(window_size + 1)
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.find_map(|window| {
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if let [preamble @ .., number] = window {
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// If none of the number combinations in the preamble
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// sum to the final number, we've got the key!
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if !preamble
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.iter()
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.combinations(2)
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.any(|combination| combination.into_iter().sum::<u64>() == *number)
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{
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Some(*number)
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} else {
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None
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}
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} else {
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unreachable!("The windows must all have a length of at least 1");
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}
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})
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.ok_or("Could not find the entry")
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use indoc::indoc;
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#[test]
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fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
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let input = indoc!(
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"35
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20
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15
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25
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47
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40
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62
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55
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65
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95
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102
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117
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150
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182
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127
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219
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299
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277
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309
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576"
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);
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let xmas = parse_xmas(input)?;
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let result = find_not_summed(&xmas, 5)?;
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assert_eq!(result, 127);
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Ok(())
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}
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#[test]
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fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
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let input = indoc!(
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"35
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20
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15
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25
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47
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40
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62
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55
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65
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95
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102
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117
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150
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182
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127
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219
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299
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277
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309
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576"
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);
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let xmas = parse_xmas(input)?;
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let key = find_not_summed(&xmas, 5)?;
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let result = find_weakness(&xmas, key)?;
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assert_eq!(result, 62);
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Ok(())
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}
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}
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