pub fn two_sum(nums: Vec<i32>, target: i32) -> Vec<i32> {

let size = nums.len();

let mut indices = HashMap::new();

for i in 0..size {

let val = nums.get(i).unwrap();

if (indices.contains_key(&(target - val))) {

let j = indices.get(&(target - val)).unwrap();

return vec![*j as i32, i as i32];

}

indices.insert(val, i);

}

return vec![0, 0];

}