Marbles problem doubt

#1

sir my factorial function is not working please help

#2

Your code is not running properly because you cannot store numbers greater than 20 factorial, so your factorial function is returning garbage value for numbers greater than that, thus resulting in WA and run time error.
You need to use an implementation of bigInt() class. If you want I can share the code.

#3

sir i dont know how to use bigint. please help me with this

#4

The answer will overflow 64 bits, so you need to use bigInt() here.
Take a look at its implementation here https://github.com/robinrst/HackerBlocks/blob/master/MARBLES.cpp
And here is the working code using bigInt() https://ide.codingblocks.com/s/195884

#5

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