Interesting Pairs time limit : 2 sec Memory limit : 256 MegaBytes
A pair ( x , y ) is called an interesting pair if it holds the following condition :- 1. x < y. 2. x is even , y is odd.
Given an array of n integers , you have to count the total no of interesting pairs.
Input format : the first line of input contains T (T<1000) the no of test cases , next two lines of each test case will contain description of each test case ,length of array n and the elements of array a1,a2,a3,.....,an (ai<10^5) .
It is guarranted that sum of n over all test cases doesn't exceed 2 * 10^5.
Output Format : the only line of output for each test case contains the total of interesting pairs.
Input : 2 10 1 2 3 4 5 6 7 8 9 10 4 2 4 10 12
Output : 10 0
Input : 1 6 4 11 5 6 9 3
Output : 8