/in/foo.cc: In function 'int main()':
/in/foo.cc:19:10: warning: 'cs' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<cs;
          ^
/in/foo.cc:6:8: warning: 'imax' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int n,imax,cs;
        ^~~~