Solve problems that are commonly asked in C++ coding interviews related to common data structures.

Ace the C++ Coding Interview

Data structures are among the fundamentals of computer science and are often a core decision in developing efficient programs. They are categorized as a vital benchmark of computer science knowledge when it comes to industry interviews. This module contains a detailed review of common data structures in C++. We'll also become well-equipped with different data structures by implementing them.
By the end of this module, we'll have expertise in solving problems in data structures.

Data Structures

# Statement

Given an unsorted array `arr` and an integer `k`, find the `k` smallest elements from the array using a Heap.

**Constraints:**

* $1 \leq$ `arr.length` $\leq 10^3$
* $1 \leq$ `k` $\leq 10^3$
* $-10^5 \leq$ `arr[i]` $\leq 10^5$

# Examples

Try to solve the Find k Smallest Elements in an Array problem.

Challenge 2: Find k Smallest Elements in the Array

Statement