fn is_almost_seq(list: &[i32]) -> bool {
    let mut last = None;
    let mut seq = true;
    for x in list {
        match last {
            None => last = Some(x),
            Some(ref mut last) => {
                if x <= last {
                    if seq {
                        seq = false;
                    } else {
                        return false
                    }
                }
                *last = x
            }
        }
    }
    true
}

#[test]
fn is_almost_seq_test() {
    assert!(is_almost_seq(&[1,2,3]));
    assert!(is_almost_seq(&[1,3,3]));
    assert!(is_almost_seq(&[1,2,3,10]));
    assert!(is_almost_seq(&[1,2,10,3]));
    assert!(is_almost_seq(&[1,2,10,3,4,5]));
    assert!(is_almost_seq(&[1,2,10,3,11,12]));
    assert!(is_almost_seq(&[10,1,2,3,4,5]));
    assert!(!is_almost_seq(&[1,2,10,3,11,5]));
    assert!(!is_almost_seq(&[1,1,1]));
}