/in/foo.cc: In function 'int main()':
/in/foo.cc:30:49: warning: 'ii' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if (fabs(shu[ii] - shu[ii + 1]) == fabs(shu[ii + 2] - shu[ii + 1]))
                                              ~~~^~~