2021 day1/rust: add solution

This commit is contained in:
Xiretza 2021-12-01 08:24:26 +01:00
parent a29f0f3064
commit a692d567c0
3 changed files with 58 additions and 0 deletions

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2021/day1/day1_rs/Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "day1_rs"
version = "0.1.0"
dependencies = [
"itertools",
]
[[package]]
name = "either"
version = "1.6.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
[[package]]
name = "itertools"
version = "0.10.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "69ddb889f9d0d08a67338271fa9b62996bc788c7796a5c18cf057420aaed5eaf"
dependencies = [
"either",
]

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[package]
name = "day1_rs"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
itertools = "0.10.1"

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use itertools::Itertools;
use std::io::{self, BufRead};
fn count_increasing(i: impl Iterator<Item = impl Ord + Clone>) -> usize {
i.tuple_windows().filter(|(x, y)| x < y).count()
}
fn main() {
let numbers: Vec<usize> = io::stdin()
.lock()
.lines()
.map(|l| str::parse(&l.unwrap()).unwrap())
.collect();
println!("{}", count_increasing(numbers.iter()));
println!(
"{}",
count_increasing(
numbers
.windows(3)
.map(|window| -> usize { window.iter().sum() })
)
);
}