Acknowledgements and References
Leetcode. Formulation of problems, tasks. Solutions from Leetcode users.
Elements of Programming Interviews in Python, by Adnan Aziz, Tsung-Hsien Lee, Amit Prakash. ISBN-10 1537713949.
A Common-Sense Guide to Data Structures and Algorithms, Second Edition, by Jay Wengrow. ISBN-10 1680507222.