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6970:I love permutation

题目描述
Mr.I has a positive integer a and an odd prime number P, satisfying a<P.

Mr.I creates a sequence $b_x=ax(mod P)$ of length $P-1$ ,where$1\leq x \leq P-1$。

Now Mr.I wants to know how many reversed pairs there are in this sequence.

Since the answer may be very large, you only need to output the value of the answer pair modulo $2$.

The definition of a reverse pair is a two-tuple $(i, j)$ that satisfies $i<j$ and $b_i>b_j$.
输入解释
The first line contains an integer $T(T\leq {10}^{5})$ . Then $T$ test cases follow.

Each test case contains two integers $a,P(1\leq a < P \leq {10}^{18})$.
输出解释
For each test case, output a single line contain the answer for the test case.
输入样例
4
2 7
3 7
4 7
5 7
输出样例
0
1
0
1

该题目是Virtual Judge题目,来自 杭电HDUOJ

源链接: HDU-6970

最后修改于 2021-10-23T19:10:52+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) 131072/131072K(Java/Others)