Where is wrong in my logic

#1

#include
#include
#include<unordered_map>
using namespace std;
int count=0;
unordered_map<string,int>mp;

int recur(int j,int n,string ai,string str){
if(j==n){

     return 0;
     
 }
   if(mp[ai]!=0){
	   return 0;
   }
   

	int t= recur(j+1,n,ai,str)+recur(j+1,n,ai+str[j],str)+1;

   mp[ai]=t;
   
   
   return t;

}
int main()
{
int q;
cin>>q;
for(int u=0;u<q;u++){
string str;
cin>>str;
int n=str.length();
int i=n;
string ai =" “;
cout<<recur(0,n,ai,str);
cout<<”\n";

mp.clear();}
return 0;

}

#2

hello @dineshjani

pls explain this line .

#3

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