/in/foo.cc: In function 'void gauss(double**, double**)':
/in/foo.cc:21:15: warning: unused variable 'p' [-Wunused-variable]
     int i,j,s,p,q,r=0,id;
               ^
/in/foo.cc:21:17: warning: unused variable 'q' [-Wunused-variable]
     int i,j,s,p,q,r=0,id;
                 ^