Problem 2, please change the references to read:
13, 2, 14, 14, 13, 14, 6, 6, 13, 14, 15, 14, 15, 13, 4, 3.
Problem 2 again, what is LRU replacement?
LRU stands for Least Recently Used. LRU replacement means that when
you have to replace an entry, you replace the entry which has not been
used in the longest time.