1、设计->页面背景->水印->自定义水印
2、文字水印自定义
#include<iostream>
using namespace std;
int s1,s2,s3;
bool flag = 1;
int main()
{
freopen("1.txt","r",stdin);
freopen("2.txt","w",stdout);
int k;cin >> k;
for(int i = 10000;i <= 30000;i++)
{
s1 = i / 100;
s3 = i % 1000;
s2 = (i/10)%1000;
if(s1%k==0&&s2%k==0&&s3%k==0)
{
cout << i <<endl;
flag = 0;
}
}
if(flag)
cout << "NO" ;//实在没想到是因为No打成了NO,太粗心了
}