HDU2203:亲和串

#include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;
char s1[250000],s2[100000];

int main()
{
    while(cin>>s1>>s2)
    {
       int str=strlen(s1);
       for(int i=str;i<2*str-1;i++)
       s1[i]=s1[i-str];
       char *ch=strstr(s1,s2);
       if(ch==NULL)
       cout<<"no"<<endl;
       else
       cout<<"yes"<<endl;
    }
    return 0;
}