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author | June McEnroe <june@causal.agency> | 2016-12-03 23:52:16 -0500 |
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committer | June McEnroe <june@causal.agency> | 2020-11-22 00:13:50 -0500 |
commit | a38fe82e85802ba9f66da8064a56badcc30b7c96 (patch) | |
tree | 6356db526989913ce0b5ade68da9d6461b7ac663 /src/bin/day03.rs | |
parent | Day 2 part 2 (diff) | |
download | aoc-a38fe82e85802ba9f66da8064a56badcc30b7c96.tar.gz aoc-a38fe82e85802ba9f66da8064a56badcc30b7c96.zip |
Day 3
Diffstat (limited to '')
-rw-r--r-- | src/bin/day03.rs | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/bin/day03.rs b/src/bin/day03.rs new file mode 100644 index 0000000..8116acb --- /dev/null +++ b/src/bin/day03.rs @@ -0,0 +1,43 @@ +use std::io::{self, Read}; +use std::str::FromStr; + +struct Triangle(u32, u32, u32); + +impl Triangle { + fn valid(&self) -> bool { + self.0 + self.1 > self.2 + && self.1 + self.2 > self.0 + && self.0 + self.2 > self.1 + } +} + +impl FromStr for Triangle { + type Err = (); + fn from_str(s: &str) -> Result<Self, ()> { + let mut iter = s.split_whitespace().map(str::parse); + match (iter.next(), iter.next(), iter.next()) { + (Some(Ok(a)), Some(Ok(b)), Some(Ok(c))) => Ok(Triangle(a, b, c)), + _ => Err(()), + } + } +} + +fn solve(input: &str) -> usize { + input.lines() + .map(str::parse) + .map(Result::unwrap) + .filter(Triangle::valid) + .count() +} + +fn main() { + let mut input = String::new(); + io::stdin().read_to_string(&mut input).unwrap(); + + println!("Part 1: {}", solve(&input)); +} + +#[test] +fn part1() { + assert_eq!(0, solve("5 10 25")); +} |