Three Summedium

fn three_sum(mut nums: Vec<i32>) -> Vec<Vec<i32>> {
    // TODO: find all unique triplets that sum to zero
    vec![]
}

fn main() {
    println!("{:?}", three_sum(vec![-1, 0, 1, 2, -1, -4]));
    println!("{:?}", three_sum(vec![0, 0, 0]));
}