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#D 相乘
本题总分：10 分
问题描述
小蓝发现，他将 1 11 至 1000000007 10000000071000000007 之间的不同的数与 2021 20212021
相乘后再求除以1000000007 10000000071000000007 的余数，会得到不同的数。
小蓝想知道，能不能在 1 11 至 1000000007 10000000071000000007 之间找到一个数，与 2021 20212021
相乘后再除以1000000007 10000000071000000007 后的余数为 999999999
999999999999999999。如果存在，请在答案中提交这个数；
如果不存在，请在答案中提交 0 00。
答案提交
这是一道结果填空的题，你只需要算出结果后提交即可。本题的结果为一个整数，在提交答案时只填写这个整数，填写多余的内容将无法得分。
import java.math.BigInteger; import java.util.*; public class Main { public
static void main(String[] args) { BigInteger bigInteger2=new
BigInteger("2021"); BigInteger bigInteger3=new BigInteger("999999999");
BigInteger bigInteger4=new BigInteger("1000000007"); for (int i = 1; i <
1000000007; i++) { BigInteger bigInteger=new BigInteger(String.valueOf(i));
bigInteger=bigInteger.multiply(bigInteger2);
bigInteger=bigInteger.mod(bigInteger4); if (bigInteger.equals(bigInteger3)) {
System.out.println(i);return; } } } }
17812964
