Why do I have AC in 0.015 sec?
I have only one 'If'!
What does it mean?
I have a lot of hard problems with
classic algo in 0.015 too!

As you may notice, a run-time of your program may be either 0.001, 0.015, 0.031, 0.046, 0.063, ... I.e. it is fixed accurate within a time slice. Some inaccuracy may surely take place. So if your program is very fast - O(1) for example - try to submit it several times and finally you will get your 0.001 sec.

Thanks.
My aim is not to have 0.001 sec.
I just wanted to know why do I have so!