#Arrays

Given an array containing only 0s, 1s, and 2s, sort the array in linear O(n) time and O(1) extra space.

Write code to find the Kth largest and Kth smallest elements in an unsorted array.

Given an unsorted integer array, find the first missing positive integer. Describe your approach to solving this problem efficiently.

Explain how JavaScript's Array.prototype.reduce() works. What are the roles of the accumulator, current element, and initial value? Walk through the given example.

Solve a problem similar to finding pairs with the minimum absolute difference in an array. The task is to identify such pairs efficiently.