/in/foo.cc: In function 'void quicksort(long long int, long long int)':
/in/foo.cc:7:12: warning: unused variable 'n' [-Wunused-variable]
  long long n,i,j,temp,t;
            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:34:20: warning: unused variable 'k' [-Wunused-variable]
  long long n,i,t=0,k=0;
                    ^