combination gen for mortoray

pair_gen.rs

#[derive(Debug)]
struct Pair {
    pub x: usize,
    pub y: usize,
}

fn combs(v: Vec<usize>) -> Vec<Pair> {
    let mut t = &v[1..];

    let mut combinations = Vec::<Pair>::new();

    let last = match v.last() {
        Some(last_val) => last_val,
        None => &0,
    };

    for i in v.iter() {
        for _ in t.iter().map(|e| combinations.push(Pair { x: *i, y: *e })) {}

        if last != i {
            t = &t[1..];
        }
    }

    combinations
}

fn main() {
    println!("{:?}", combs(vec![1, 2, 3, 4, 5, 6]));
}