===作业提交===
Group1 [http://gitlab.icenter.tsinghua.edu.cn/xavieryao/bitmap-db | Group1]
Group3 [http://gitlab.icenter.tsinghua.edu.cn/3rd_group/bitmap_indexing | Group3]
Group4 [http://gitlab.icenter.tsinghua.edu.cn/taanng/Bitmap | Group4]
Group5 [http://gitlab.icenter.tsinghua.edu.cn/ddeerreekk/Experiment_1_Bitmap_Index | Group5]
Group6 [http://gitlab.icenter.tsinghua.edu.cn/group6/project1 | Group6]
Group8 [http://gitlab.icenter.tsinghua.edu.cn/FQX/bitmap | Group8]
==项目2描述==