use std::cmp::min;

pub fn array_pair_sum(mut nums: Vec<i32>) -> i32 {
    let mut acc_sum = 0;
    nums.sort();
    for chunk in nums.chunks(2) {
        if let [a, b] = chunk {
            acc_sum += min(a, b);
        }
    }
    acc_sum
}

pub fn main() {
    println!("Expected: 4");
    println!("Got: {}", array_pair_sum(vec![1, 4, 3, 2]));
}