题目难度与题目顺序无关！！！！！
1、E题数据范围改为 1≤∑n≤10001 \le \sum n\le 10001≤∑n≤1000
2、M题数据范围改为 1≤∑n≤20001 \le \sum n \le 20001≤∑n≤2000
3、C题样例改为
``
5
1 2 1 2 3
20
By signing up a Hydro universal account, you can submit code and join discussions in all online judging services provided by us.
Using your Hydro universal account
