9. The computer's undo function is a good example of a (a) stack to queue (e) linked list () binary tree(e) someone who just said "uh oh!" hunt where each time you find a clue, it tells you where to find the next clue. Unfortunately the treasue null. This is most similar to a (a) stack (bqueue (c) linked list (d) binary tree 11- 16. In the binary tree below, write in the empty circles where these numbers belong: 99 75 5 18 20 52 23 9 6 17. On the class web site, primes4.txt contains (a) all prime numbers less than 100 (e) all prime numbers less than a googol (b) the first million prime numbers e) the firt googleplex prime numbers 18. What is the Big-O of a hash table search? (a) O(n) (b) O(m) (c) O) (d) Ologo) (e) o(a) 19. What is the primary purpose of a hash function? (a) calculate bit depths (c) compresses values to save space (b) provides a binary tree searches (c) maps a key to its value for fast searches 20. What is cryptographic hashing used for? (a) storing passwords as hashes in case server is compromised (b) fast (c) hashed virtualization indexed database searches (d) password recovery 21. What graphing library did we use to create our Interstate highway program? (a) Swing (b) JChart()XGraph (d) JGraphT 22. In the maze program, we created a(n) (a) undirected weighted graph (e) undirected unweighted graph (b) directed weighted graph (d) directed unweighted graph