alpc_paul的专栏

利用

import java.util.*;import java.math.*;public class Main { static int n; static BigInteger[] a = new BigInteger[4100]; static BigInteger c,ans,p; public static void slove() { ans=BigInte

题目链接：import java.util.*;import java.io.*;import java.math.*;public class test { public static void main(String[] args) throws IOException{ BigInteger zero=BigInteger.valueOf(0