Dr. Strange's powers

PROBLEM :
Dr. Strange has developed some new powers since he has started programming. Now if a villan throws a 1 at him, he absorbs it and add it to his already existing binary string s. There are n villans and each of them throws a '1' at him. At each point you have to detemine the resulting string s.

Input:
First line of input contains n denoting the number of enemies. Each of the next n lines contain an integer l and a string s denoting the length of the existing binary string and the string itself.

Output:
For each of the n lines print a string denoting the resulting binary string at each steps.


Constraints:
1<=n<=20
1<=l<=100

Example:
Input:
2
4
1010
5
11100

Output
1011
11101

Explanation:
For test case 1 : 1010+1 = 1011 as he absorbs 1 and add to the existing string

--------------------------------------------------------------------------------
SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

#include<iostream>
using namespace std;
#include <string>
string addOne(string ,int ) ;
int main()
 {
    int t,no ;
    string str ;
    cin>>t ;
    while(t--)
    {
        cin>>no ;
        cin>>str ;
       
        str=addOne(str,no) ;
        cout<<str<<endl ;
    }
return 0;
}

string addOne(string str,int no)
{
    int rem,i ;
    rem=1 ;
    string s ;
    for(i=no-1;i>=0;i--)
    {
        if(rem!=0)
        {
            if(str[i]=='1')
                str[i]='0' ;
            else
            {
                str[i]='1' ;
                rem=0 ;
                break ;
            }
        }
    }
   
    if(rem==1)
    {
        s='1' ;
        s=s+str ;
        return s ;
    }
   
    return str ;
 
}

---------------------------------------------------------------------------------

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