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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner s =new Scanner(System.in);
		factor z=new factor();
 
		BigInteger b= new BigInteger("1");
		BigInteger i = new BigInteger("0");
		BigInteger [] a= new BigInteger [100];
		BigInteger [] p=new BigInteger[100];
		BigInteger n=s.nextBigInteger();
 
		while(i.compareTo(n))
		{
			a[i]=s.nextBigInteger();
			i.add(b);
		}
 
		while(i.compareTo(n))
		{
			p[i]=z.factorial(a[i]);
			i.add(b);
		}
		}
	}
 
 
class factor{
	public static BigInteger factorial(BigInteger n) {
 
       BigInteger fact = new BigInteger("1");
       BigInteger i = new BigInteger("0");
       BigInteger a = new BigInteger("1");
 
        while(i.compareTo(n))
        {
            fact =  fact.multiply(i) ;
            i.add(a);
         }
        return fact;
    }
}

Main.java:23: error: incompatible types
		while(i.compareTo(n))
		                 ^
  required: boolean
  found:    int
Main.java:25: error: incompatible types
			a[i]=s.nextBigInteger();
			  ^
  required: int
  found:    BigInteger
Main.java:29: error: incompatible types
		while(i.compareTo(n))
		                 ^
  required: boolean
  found:    int
Main.java:31: error: incompatible types
			p[i]=z.factorial(a[i]);
			  ^
  required: int
  found:    BigInteger
Main.java:31: error: incompatible types
			p[i]=z.factorial(a[i]);
			                   ^
  required: int
  found:    BigInteger
Main.java:45: error: incompatible types
        while(i.compareTo(n))
                         ^
  required: boolean
  found:    int
6 errors

Standard output is empty