Camp:
Day1:
https://cn.vjudge.net/contest/316129#overview
Day2:
https://cn.vjudge.net/contest/316940#overview
Day3:
https://cn.vjudge.net/contest/316943#overview
Day4:
https://cn.vjudge.net/contest/316946#overview
Day5:
https://cn.vjudge.net/contest/316947#overview
Day6: