how can i resolve Hackerrank "terminated for timeout"?

the question is to find no of reversible no.s below the following test cases and here reversible no.s means like 36 + 63 = 99 (contains both odd digit). both 36 and 63 are reversible . and we have to find total reversible no.s below a number.

i have also declared functions as inline , but it is still giving timeout error . for test case#1 to test case#5

inline std::string IntToString ( int number )
    {
      std::ostringstream oss;
       oss<< number;
      return oss.str();
    }


inline int replacer (int n)

{
int r,R=0;

while(n!=0)
    {
       r=n%10 ;
    R=R*10+r ;
     n=n/10;
}

return R ;

}




int main() {
/* Enter your code here. Read input from STDIN. Print output to STDOUT */   

int i,n,t,j,R,Q,L,k,d=0,M=0,D; 


cin>>t ; 

for(i=0;i<t;i++ )
    {
    M=0;
    cin>>n ;

    for(j=1;j<n;j++)
        {


        if(j%10!=0)
       { d=0;
        R= replacer(j) ;

       Q=R+j ;
        std::string C = IntToString (Q);

        L=C.size() ;  


        for(k=0;k<L;k++)
           if(C[k]%2==0)
            d=1 ;
           if(d==0) 
          M++ ;
       }    
    }
    cout<<M<<endl ;
    }


return 0;
}