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Given an array a of N distinct numbers, write a function to count the number of ordered pairs of indices i,j such that ij, 0i

Given an array a of N distinct numbers, write a function to count the number of ordered pairs of indices i,j such that ij, 0i
For example:
a[] ={1,2,6,3,4,5}
Output= 2.
Explanation: min(a)=1 and max(a)=6
2+5 = min(a)+max(a) and 3+4 = min(a)+max(a)
Note: You can define other helper functions upon need.

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