Algo2. Task3. Knapsack test-data
Algo2. Task3. Knapsack
Added a note to the UnionFind.join_subsets() on how to make it work in O(log n) time.
Notes on execution time  for Kruskal's MST.
Algo 2. Assignment 3. Knapsack C++ implementation. Runs 80 times faster than in Ruby!! (see notes in knapsack.rb)