zoj 1729 Hidden Password

#include <cstdio>#include <cstring>#include <cstdlib>#include <vector>#include <cmath>#include <iostream>#include <algorithm>#include <functional>#include <map>#include <cctype>using namespace std;char str[200010];char str2[100010];int main(){    int T,L;    scanf("%d",&T);    while(T--)    {        scanf("%d %s",&L,str);        int len=strlen(str);        strcpy(str2,str);        strcat(str,str2);        int i,j,k;        i=0;j=1;k=0;        while(k<len&&i<len&&j<len)        { if(str[i+k]==str[j+k]) {     k++; } else {     if(str[i+k]>str[j+k])     {         i=i+k+1;         if(i==j)  i++;     }     else     {         j=j+k+1;         if(i==j)  j++;     }     k=0; }        }        printf("%dn",i<j?i:j);    }    return 0 ;}