编程介的小学生 2017-01-30 05:06 采纳率: 20.5%
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树状数组

Problem Description
Long long ago, there is a sequence A with length n. All numbers in this sequence is no smaller than 1 and no bigger than n, and all numbers are different in this sequence.
Please calculate how many quad (a,b,c,d) satisfy:
1. 1≤a<b<c<d≤n
2. Aa<Ab
3. Ac<Ad

Input
The first line contains a single integer T, indicating the number of test cases.
Each test case begins with a line contains an integer n.
The next line follows n integers A1,A2,…,An.

[Technical Specification]
1 <= T <= 100
1 <= n <= 50000
1 <= Ai <= n

Output
For each case output one line contains a integer,the number of quad.

Sample Input
1
5
1 3 2 4 5

Sample Output
4

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  • devmiao 2017-01-30 15:53
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    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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