Explanation of greedy algorithm , knapsack problem and 0/1 knapsack problem https://www.youtube.com/watch?v=n30NtgQuTs8&list=PL6IvlrZs_fGov2ocUF0dV1b9FhqFs9FmB&index=3 https://www.youtube.com/watch?v=aBQ2vLQsD6s&list=PL6IvlrZs_fGov2ocUF0dV1b9FhqFs9FmB&index=4