in this code
main (){
int n ; cin >> n ;
double arr[n] ;
for(int i = 0 ; i < n ; i++)cin >>arr[i] ;
int cnt = 0;
for(int i = 0 ; i < n-1 ; i++)
for(int j = i +1 ; j < n ; j ++ )
{
double l = log10(arr[i]+arr[j])/log10(2);
int r = l ;
if(l-(double)r==0) cnt++ ;
}
cout<<cnt ;
}
when input is
4 7 3 2 1 it gives cnt = 1 because the the compiler of codeforces when arr[i] =7 and arr[j]=1 gives l=3 but r=2 ! (it dosent happen in other compilers)
even this similar code gives wa i think because of the same reason 147734731 thanks .