use std::env;
fn main() {
    let mut args = env::args().skip(1).flat_map(|num| num.parse());
    let rows = args.next().expect("Expected number of rows as first argument");
    let cols = args.next().expect("Expected number of columns as second argument");

    assert!(rows != 0 && cols != 0);

    // Creates a vector of vectors with all elements initialized to 0.
    let mut v = init_vec(rows, || init_vec(cols, || 0));
    v[0][0] = 1;
    println!("{}", v[0][0]);


}

// Returns a dynamically-allocated array of size `n`,
// initialized with the values computed by `f`

fn init_vec<F,T>(n: usize, f: F) -> Vec<T>
    where F: Fn() -> T
{
    let mut vec = Vec::with_capacity(n);
    for _ in 0..n {
        vec.push(f());
    }
    vec
}