Find the Inversion Count of an Array [ Microsoft, Flipkart]

Problem: Inversion Count for an array indicates – how far (or close) the array is from being sorted. If array is already sorted then inversion count is 0. If array is sorted in reverse order that inversion count is the maximum. Formally speaking, two elements a[i] and a[j] form an inversion if a[i] > a[j] and

Merge Sort


Find Minimum difference pair [ Amazon Interview Question]

Problem: Find the minimum difference between any pair in an unsorted  array.