Shortest path problem, Big(O) analysis, Degree Centrality, Eigenvector Centrality, Closeness Centrality, Betweenness Centrality
main2.py file needs to be executed first
array_methods.py,dijkstras_array.py, dijkstras_heap_updated.py, heap_updated.py files are called by main2.py
test_matrix.txt file is used as arc-weight matrix input
question3.py file needs to be executed next questions 4.py file needs to be executed last