pku2635.java

这是ACM 方面的资料 是PKU的 北京大学的出来的

import java.io.*;
import java.util.*;
import java.math.BigInteger;

class Main
{
	public static void main(String args[]) throws Exception
	{
		Scanner cin=new Scanner(System.in);
		BigInteger bi;
		String s;
		int i, t;
		while (cin.hasNext())
		{
			s = cin.next();
			t = cin.nextInt();
			if (t == 0)
			{
				break;
			}
			bi = new BigInteger(s);
			
			if (bi.mod(BigInteger.valueOf(2)).equals(BigInteger.ZERO))
			{
				if (t > 2)
				System.out.println("BAD 2");
				else
				System.out.println("GOOD");
				continue;
			}
			
			if (bi.mod(BigInteger.valueOf(3)).equals(BigInteger.ZERO))
			{
				if (t > 3)
				System.out.println("BAD 3");
				else
				System.out.println("GOOD");
				continue;
			}

			if (bi.mod(BigInteger.valueOf(5)).equals(BigInteger.ZERO))
			{
				if (t > 5)
				System.out.println("BAD 5");
				else
				System.out.println("GOOD");
				continue;
			}
			
			for (i = 5; i < t; i+=2)
			{
				if (i % 3 == 0 || i % 5 == 0)
				{
					continue;
				}
				if (bi.mod(BigInteger.valueOf(i)).equals(BigInteger.ZERO))
				{
					System.out.println("BAD " + i);
					break;
				}
			}
			if (i >= t)
			{
				System.out.println("GOOD");
			}
		}

	}
}