https://medium.com/karuna-sehgal/a-simplified-explanation-of-the-big-o-notation-82523585e835 https://www.interviewcake.com/article/javascript/big-o-notation-time-and-space-complexity? https://justin.abrah.ms/computer-science/big-o-notation-explained.html https://www.topcoder.com/blog/learning-understanding-big-o-notation/ https://justin.abrah.ms/computer-science/how-to-calculate-big-o.html https://www.youtube.com/watch?v=Ee0HzlnIYWQ&t=397s https://www.youtube.com/playlist?list=PLOtl7M3yp-DV69F32zdK7YJcNXpTunF2b