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use std::io::BufReader;
use std::io::prelude::*;
use std::fs::File;
struct Triangle {
l1: i32,
l2: i32,
l3: i32
}
impl Triangle {
fn is_valid(&self) -> bool {
(self.l1 + self.l2) > self.l3 &&
(self.l2 + self.l3) > self.l1 &&
(self.l3 + self.l1) > self.l2
}
}
fn main() {
let len = read_file().iter().filter(|tri| tri.is_valid()).count();
println!("{} valid triangles", len);
}
fn read_file() -> Vec<Triangle> {
let file = BufReader::new(File::open("input.txt").unwrap());
let mut lines = file.lines()
.map(|line| line.unwrap().trim().to_string())
.filter(|line| line.len() > 0)
.peekable();
let mut results = Vec::new();
while lines.peek().is_some() {
let (t11, t21, t31) = parse_line(lines.next().unwrap());
let (t12, t22, t32) = parse_line(lines.next().unwrap());
let (t13, t23, t33) = parse_line(lines.next().unwrap());
results.push(Triangle {
l1: t11,
l2: t12,
l3: t13
});
results.push(Triangle {
l1: t21,
l2: t22,
l3: t23
});
results.push(Triangle {
l1: t31,
l2: t32,
l3: t33
});
}
results
}
fn parse_line(line: String) -> (i32, i32, i32) {
let mut separated = line.split_whitespace();
(separated.next().unwrap().trim().parse().unwrap(),
separated.next().unwrap().trim().parse().unwrap(),
separated.next().unwrap().trim().parse().unwrap())
}
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