Thank you for your kind words, but I still don't think I can explain these topics well. I know them, but I feel I can explain them better. In this article, I tried to talk about the binary knapsack. The binary knapsack is the result of a collective evolution in operations research in the 1950s, with fundamental contributions from George Dantzig. These are also important topics for keeping your mind sharp. Conducting an operations research exercise is mental training. !PIZZA