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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 solve1(input: &str) -> usize {
input.lines()
.map(str::parse)
.map(Result::unwrap)
.filter(Triangle::valid)
.count()
}
fn solve2(input: &str) -> usize {
let triangles: Vec<Triangle> = input.lines()
.map(str::parse)
.map(Result::unwrap)
.collect();
triangles.chunks(3)
.flat_map(|triple| {
vec![
Triangle(triple[0].0, triple[1].0, triple[2].0),
Triangle(triple[0].1, triple[1].1, triple[2].1),
Triangle(triple[0].2, triple[1].2, triple[2].2),
]
})
.filter(Triangle::valid)
.count()
}
fn main() {
let mut input = String::new();
io::stdin().read_to_string(&mut input).unwrap();
println!("Part 1: {}", solve1(&input));
println!("Part 2: {}", solve2(&input));
}
#[test]
fn part1() {
assert_eq!(0, solve1("5 10 25"));
}
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