The lower_bound() and upper_bound() functions by default work on non decreasing array. The lower_bound() function finds iterator of first element that does not compare less to given element. The upper_bound() function returns iterator to first element that is greater.
Given an array converting this to an non increasing vector, applying the std:: upper_bound and std:: lower_bound function to the vector
For array sorted in non-increasing array, lowe_bound() finds iterator to first element that does not compare greater than to given element. upper_bound() finds iterator to first element that is smaller than given element. We use grater() for this purpose.
lower_bound at position 5 upper_bound at position 4
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