When you check this question , you will find that addit is containsalready O (1). Thus, there are not many improvements.
And I think that these two would be the only ones who could use this restriction:
.
: , , , , , . , . ...
, O (1) O (1.5); :
O (1) O (n) , , . O (1.0) O (1.005)... .
: "" , "" . , , , ; JVM . , , .
; , . , ; : . : ; ; .
; " " ( , ). real (, , ) .