Earliest time to finish one task

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::earliest_time(vec![vec![1, 6], vec![2, 3]]);
    let expected = 5;
    log_result!(val == expected, "t1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t2() {
    let start = std::time::Instant::now();
    let val = Solution::earliest_time(vec![vec![100, 100], vec![100, 100], vec![100, 100]]);
    let expected = 200;
    log_result!(val == expected, "t2", start, &expected, &val);
    assert_eq!(val, expected);
}

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

#[test]
fn t4() {
    let start = std::time::Instant::now();
    let val = Solution::earliest_time(vec![vec![5, 5], vec![3, 10]]);
    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::earliest_time(vec![vec![10, 1], vec![1, 10]]);
    let expected = 11;
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}