Divide players into teams of equal skill

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::divide_players(vec![3, 2, 5, 1, 3, 4]);
    let expected = 22;
    log_result!(val == expected, "t1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t2() {
    let start = std::time::Instant::now();
    let val = Solution::divide_players(vec![3, 4]);
    let expected = 12;
    log_result!(val == expected, "t2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t3() {
    let start = std::time::Instant::now();
    let val = Solution::divide_players(vec![1, 1, 2, 3]);
    let expected = -1;
    log_result!(val == expected, "t3", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t4() {
    let start = std::time::Instant::now();
    let val = Solution::divide_players(vec![1, 2, 3, 4]);
    let expected = 10;
    log_result!(val == expected, "t4", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t5() {
    let start = std::time::Instant::now();
    let val = Solution::divide_players(vec![2, 2, 2, 2]);
    let expected = 8;
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}