补题地址:https://zjusummer.contest.codeforces.com/
ZJU-ICPC Summer 2020 Contest 1 by Group A
Problem A. MUG
Problem B. Count Angles
Problem F. Balloo ......
http://singularityhub.com/2011/04/01/watch-the-wifi-visually-stunning-look-at-the-digital-world-invading-cities-video-2/
video
http://www.nearfield.or ......