Cannot able to submit in CB que is MARBLES

#1

submitted in spoj , but showing WA in CB.
here is my code.

#2

For an input that gives huge answer like : 64 30
Your code generates 310981744965266872 whereas answer is 759510004936100355.
You need to handle this to avoid overflow.
Rest everything is fine.

#3

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#4

i have taken every variable in unsigned long long , yet it is giving me wrong answer. Please make changes in my code.