Storing and accessing values in an array is faster and less complicated than using a more complex data structure. One of the main advantages of using more complex data structures is the use of methods provided by the standard library for common operations related to the data structure, e.g., push() and pop() methods for a stack.
However, storing a complete binary tree in an array still allows us to perform all operations relevant to the tree with much ease. We can find the left child, right child, parent node, root, and the last element of a tree with basic arithmetic operations on the index of the current node or the variable maintaining the size of the tree.