update course material

Author: NeverBehave

.gitignore

@@ -1,4 +1,5 @@
 **/out
 **/.idea
 **/*.class
-others/
+others/
+.DS_Store

BattleShip/grade.png

@@ -0,0 +1,13 @@
+import networkx as nx
+import csv
+
+if __name__ == "__main__":
+    print('This program will generate a Barabási–Albert preferential attachment graph '
+          'and save it in the adjacency list format.')
+    n, m = [int(val) for val in input("Enter the values for n and m: ").split()]
+    output_file_name = input("Enter the name for the output file: ")
+    # G = nx.complete_graph(10)
+    G = nx.barabasi_albert_graph(n, m)
+    print(str(len(G.nodes())) + ' nodes and ' + str(len(G.edges())) + " edges")
+    G1 = nx.relabel_nodes(G, {label: '"' + str(label) + '"' for label in G.nodes()})
+    nx.write_edgelist(G1, output_file_name, delimiter=',', data=False)