#include
     
      #include
      
       #include
       
        using namespace std;typedef vector
        
          vectorString;vectorString permu(string str){    if(str.length()==0)    {        vectorString vs;         vs.push_back("");        return vs;    }else if(str.length()==1)    {        vectorString vs;        vs.push_back(str);        return vs;    }    vectorString vs;    string ch=str.substr(0,1);    vectorString vsTmp= permu(str.substr(1));    for(int i=0;i