the coordinates of the destination do not have to be integers.

All values in input are integers.

what to consider???????????????????????

Here, "the destination" means the destination of a move, not (X, Y). (Update after the contest: the statement now explicitly says "the destination of a move".)

I am not able to follow the third condition. 

Sorry, we forgot to write "are the same" at the end of the third condition. We will fix it soon.