Since already lots of libraries in most of the programming languages offer pre-built Heaps, knowing how it works and how to use the implementations to get our desired output often suffice. We can now implement Priority Queue requirements with the help of a Binary heap but in extreme rare occasions, we will need to write the entire implementation from scratch by ourselves. To distinguish between Leaf and internal nodes, we have : if n is the length of the array, then any node at index i is internal if 2*i+2 <= n. Here we can clearly see that for each node at index i, the children nodes are at (2*i + 1, 2*i +2) Now some points to note from the array implementation:
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