tienhoangngu
Aug '17

My code is:

import java.math.BigInteger;
import java.util.Scanner;

public class Main{

public static void main(String[] args) {
	Scanner ob = new Scanner(System.in);
	int t,n;
	
	
	t = ob.nextInt();

	for (int i = 1; i <= t; i++) {

		n = ob.nextInt();
		System.out.println(Xuly(n));
	}
	ob.close();
}

public static BigInteger Xuly(int n){
	if (n ==0){
		return BigInteger.ONE;
	}
	
	BigInteger result = BigInteger.ONE;
	
	for (int i = 1; i <= n; i++) {
		result = result.multiply(BigInteger.valueOf(i));
	}
	
	return result;
}

}

Why the result is : time limit exceeded??
why?