Three days in the main review, review the tree line, Fenwick tree and disjoint-set part. In addition to the review exercise also did read the question, do more school race questions, feel hard. Tonight do more school race question there is a problem with the tree line to do, read a long time have not thought of using tree line, but did not realize just thought with Fenwick tree. Or to see the title before the summary is not enough, more attention needs attention. We have a week and a half to go to the regional tournament this week and a half to keep the review and exercises to keep the operation state of mind, to do our best.
