Popularity tree is a type of binary tree in data structure that will arrange the nodes in a manner such that while BFS traversal the authors will get the nodes in decreasing order of popularity.

This tutorial launches a short series introducing data structures and algorithms. In Part 1, you’ll learn what a data structure is and how data structures are classified.

Instead of just building a single tree, they constructed many trees from the genes and proteins and then compared them to each other to find the best fit to the data.