/in/foo.cc: In function 'int main()':
/in/foo.cc:4:6: warning: unused variable 'c' [-Wunused-variable]
  int c,t,sum=1,i,j,n,p,q;
      ^
/in/foo.cc:4:22: warning: unused variable 'p' [-Wunused-variable]
  int c,t,sum=1,i,j,n,p,q;
                      ^
/in/foo.cc:4:24: warning: unused variable 'q' [-Wunused-variable]
  int c,t,sum=1,i,j,n,p,q;
                        ^