A small mistake will cost your long time

All the things in my code is right, but only a very small analysis
on the solution is uncorrect, but for a common case the analysis is correct,
there is no matter in the common case. In some particular case, it will
give you discontinuous solution, although the solution is right, but the line which
reflect he history of the process is wrong. With spending a weekly time, i have
got right line. In my mind. a small mistake will cost your long time.