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2015: day04: part 1

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This commit is contained in:
Antoine Martin 2019-12-03 15:06:28 +01:00
parent a81ad7c114
commit ce83c56841
6 changed files with 129 additions and 1 deletions
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76
Cargo.lock generated
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@ -9,6 +9,7 @@ name = "aoc2015"
version = "0.1.0"
dependencies = [
"aoc 0.1.0",
"md-5 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
@ -25,3 +26,78 @@ dependencies = [
"aoc 0.1.0",
]
[[package]]
name = "block-buffer"
version = "0.7.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"block-padding 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
"byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
"byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
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1
aoc2015/Cargo.toml
View file

@ -9,3 +9,4 @@ edition = "2018"
[dependencies]
aoc = { path = "../aoc" }
md-5 = "0.8"

1
aoc2015/input/day04.txt Normal file
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@ -0,0 +1 @@
yzbqklnj

48
aoc2015/src/day04.rs Normal file
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@ -0,0 +1,48 @@
use md5::{Digest, Md5};
use aoc::err;
use aoc::Result;
const INPUT: &str = include_str!("../input/day04.txt");
pub fn run() -> Result<()> {
println!("part 1: {}", part1(INPUT)?);
Ok(())
}
fn part1(input: &str) -> Result<u64> {
let input = input.trim_end();
let mut hasher = Md5::new();
for i in 0.. {
let content = format!("{}{}", input, i);
hasher.input(content);
let res = format!("{:x}", hasher.result_reset());
if &res[..5] == "00000" {
return Ok(i);
}
}
Err(err!("couldn't find a suitable number"))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[ignore] // takes too long!
fn part1_provided() {
assert_eq!(part1("abcdef").unwrap(), 609043);
assert_eq!(part1("pqrstuv").unwrap(), 1048970);
}
#[test]
#[ignore] // takes too long!
fn part1_real() {
assert_eq!(part1(INPUT).unwrap(), 282749);
}
}

1
aoc2015/src/lib.rs
View file

@ -1,3 +1,4 @@
pub mod day01;
pub mod day02;
pub mod day03;
pub mod day04;

3
aoc2015/src/main.rs
View file

@ -3,9 +3,10 @@ use aoc::Result;
use aoc2015::day01;
use aoc2015::day02;
use aoc2015::day03;
use aoc2015::day04;
fn main() -> Result<()> {
let days: &[fn() -> Result<()>] = &[day01::run, day02::run, day03::run];
let days: &[fn() -> Result<()>] = &[day01::run, day02::run, day03::run, day04::run];
aoc::run(days)
}