https://www.tutorialspoint.com/data_structures_algorithms/bubble_sort_algorithm.htm
https://www.geeksforgeeks.org/analysis-of-different-sorting-techniques/
https://www.cs.usfca.edu/~galles/visualization/ComparisonSort.html
https://brilliant.org/wiki/breadth-first-search-bfs/
https://www.cs.auckland.ac.nz/software/AlgAnim/AVL.html
https://www.hackerearth.com/practice/algorithms/graphs/depth-first-search/tutorial/