Given an array of integers named x, write a method named countInversions that returns the number of inversions in the array. An inversion is defined as a pair of elements where the first element is greater than the second element and the first element appears before the second element in the array. The method should return the total count of such inversions.
For example, consider an array with the values {1, 4, 3, 2}. There are 3, inversions since 4 is greater than both 3 and 2 and 3 is greater than 2.