Video solution with explanation in C++, Python: https://youtu.be/_I2MIuvbGog
Amazing. Please upvote for karma point its 0 
In subtask 1,What if there are no numbers in the given test case i.e (any number) divisible by ‘a’ then the result will be “ALICE”.But in subtask 1,I have just printed “BOB”.please clarify about it
because its given that the current player can remove any number of elements(see point number 2). as the bob will get first chance he will remove all elements divisible . hence no element left for alice