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author | June McEnroe <june@causal.agency> | 2020-11-22 00:14:20 -0500 |
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committer | June McEnroe <june@causal.agency> | 2020-11-22 00:14:20 -0500 |
commit | d108e00be1a28e48ca88e0be5026263f08a2be2e (patch) | |
tree | 1474f754f7b3153f9187751a3b83f46825047b50 /src/bin/day05.rs | |
parent | Use math to rotate in day 4 (diff) | |
download | aoc-d108e00be1a28e48ca88e0be5026263f08a2be2e.tar.gz aoc-d108e00be1a28e48ca88e0be5026263f08a2be2e.zip |
Day 5
Diffstat (limited to '')
-rw-r--r-- | src/bin/day05.rs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/bin/day05.rs b/src/bin/day05.rs new file mode 100644 index 0000000..a860e53 --- /dev/null +++ b/src/bin/day05.rs @@ -0,0 +1,39 @@ +extern crate crypto; + +use std::io::{self, Read}; + +use crypto::digest::Digest; +use crypto::md5::Md5; + +fn solve(input: &str) -> String { + let mut password = String::new(); + let mut index = 0u64; + + while password.len() < 8 { + let mut md5 = Md5::new(); + md5.input_str(input); + md5.input_str(&index.to_string()); + let digest = md5.result_str(); + + if &digest[0..5] == "00000" { + password.push_str(&digest[5..6]); + } + + index += 1; + } + + password +} + +fn main() { + let mut input = String::new(); + io::stdin().read_to_string(&mut input).unwrap(); + + println!("Part 1: {}", solve(input.trim())); +} + +#[test] +#[ignore] +fn part1() { + assert_eq!("18f47a30", solve("abc")); +} |