Instructions for Q1:
hadoop jar hw1.jar MutualFriends <input to adj.txt> <output path>
Instructions for Q2:
hadoop jar hw1.jar MutualFriendsCount <input to adj.txt> <output path>
Instructions for Q3:
hadoop jar hw1.jar MutualFriendsInMemoryJoin <input to adj.txt> <output path>
Instructions for Q4:
hadoop jar hw1.jar UserFriendsTopAvg <input to adj.txt> <output path>