/in/foo.cc: In function 'int main()':
/in/foo.cc:14:11: warning: unused variable 'k' [-Wunused-variable]
 int n,i,j,k,q,w,t=0;
           ^
/in/foo.cc:14:13: warning: unused variable 'q' [-Wunused-variable]
 int n,i,j,k,q,w,t=0;
             ^
/in/foo.cc:14:15: warning: unused variable 'w' [-Wunused-variable]
 int n,i,j,k,q,w,t=0;
               ^
/in/foo.cc:14:17: warning: unused variable 't' [-Wunused-variable]
 int n,i,j,k,q,w,t=0;
                 ^