• The creator of this contest is solely responsible for setting and communicating the eligibility requirements associated with prizes awarded to participants, as well as for procurement and distribution of all prizes. The contest creator holds HackerRank harmless from and against any and all claims, losses, damages, costs, awards, settlements, orders, or fines.
• Code directly from our platform, which supports over 30 languages. Learn more here.

1.鼓励大家使用C/C++/Python语言(如用python,建议使用pypy2/pypy3)进行竞赛，本次竞赛不接受其它语言。

2.鼓励公平竞技，严禁各种作弊行为（包括但不限于复制其他同学的代码、多名选手使用一个账号参加竞赛等。违规行为一经发现，相关同学的成绩都将视为无效）。

3.正式比赛结束后，会进行代码查重。

4.每题时限(C/C++ 2s, Python 10s, pypy 3s, 内存上限都是512MB)