# SC20

[![6bf032c2bee94d6c2443c021836f9559.png](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/scaled-1680-/6bf032c2bee94d6c2443c021836f9559.png)](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/6bf032c2bee94d6c2443c021836f9559.png)
[![2b527be12dffedc3e634ca91a0ce1f34.png](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/scaled-1680-/2b527be12dffedc3e634ca91a0ce1f34.png)](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/2b527be12dffedc3e634ca91a0ce1f34.png)
[![6b2911ba4fc9e8f097fa771b03638a83.png](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/scaled-1680-/6b2911ba4fc9e8f097fa771b03638a83.png)](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/6b2911ba4fc9e8f097fa771b03638a83.png)
[![de9e84c5b32ef07ee6efffbafce453b9.png](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/scaled-1680-/de9e84c5b32ef07ee6efffbafce453b9.png)](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/de9e84c5b32ef07ee6efffbafce453b9.png)
[![e1bed5aa30efa2c79300ad2d09f46891.png](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/scaled-1680-/e1bed5aa30efa2c79300ad2d09f46891.png)](https://stu.cs.tsinghua.edu.cn/scc/uploads/images/gallery/2021-04/e1bed5aa30efa2c79300ad2d09f46891.png)