<ul><li>Given an unsorted array, the task is to find the least difference between the element pairs and display all the pairs present.</li><li>To solve this problem, we can follow the following steps:</li><li>1. Sort the given array.</li><li>2. Find the least difference among adjacent elements.</li><li>3. Print all the pairs with the least difference.</li><li>By applying the given solution, the pairs with the least difference {1, 2}, {2, 3}, {3, 4}, and {4, 5} can be obtained from the input array {5, 4, 3, 2, 1}.</li><li>A C programming solution for this problem is also provided in the news content.</li></ul>

Given an unsorted array, find the least difference between the element pairs. Display all the pairs present.

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