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6304:Chiaki Sequence Revisited

题目描述
Chiaki is interested in an infinite sequence $a_1, a_2, a_3, ...$, which is defined as follows:
$$a_n=\begin{cases}1 & n = 1,2 \\ a_{n - a_{n-1}} + a_{n-1 - a_{n-2}} & n \ge 3\end{cases}$$
Chiaki would like to know the sum of the first $n$ terms of the sequence, i.e. $\sum\limits_{i=1}^{n}a_i$. As this number may be very large, Chiaki is only interested in its remainder modulo ($10^9 + 7$).
输入解释
There are multiple test cases. The first line of input contains an integer $T$ ($1 \le T \le 10^5$), indicating the number of test cases. For each test case:
The first line contains an integer $n$ ($1 \le n \le 10^{18}$).
输出解释
For each test case, output an integer denoting the answer.
输入样例
10
1
2
3
4
5
6
7
8
9
10
输出样例
1
2
4
6
9
13
17
21
26
32
来自杭电HDUOJ的附加信息
Recommend liuyiding

该题目是Virtual Judge题目,来自 杭电HDUOJ

源链接: HDU-6304

最后修改于 2020-10-25T23:30:08+00:00 由爬虫自动更新

共提交 0

通过率 --%
时间上限 内存上限
2000/1000MS(Java/Others) 32768/32768K(Java/Others)