Sir m not getting the logic behind the que

#1

please explain the logic and approach for the que

#2

You have to find the factorial of very large numbers.
You can’t store the factorials of 100, 200… for that you can use array which can store upto 10^6 size.
Basic idea would be:

Create an array ‘res[]’ of MAX size where MAX is number of maximum digits in output.
Initialize value stored in ‘res[]’ as 1 and initialize ‘res_size’ (size of ‘res[]’) as 1.
Do following for all numbers from x = 2 to n.
……a) Multiply x with res[] and update res[] and res_size to store the multiplication result.
multiply(res[], x)

Initialize carry as 0.
Do following for i = 0 to res_size – 1
….a) Find value of res[i] * x + carry. Let this value be prod.
….b) Update res[i] by storing last digit of prod in it.
….c) Update carry by storing remaining digits in carry.
Put all digits of carry in res[] and increase res_size by number of digits in carry.

go through the below link

#3

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