clrs; exercise 8.3.3 - prove RADIX-SORT
clrs; exercise 8.3.4 - sort n³-1 numbers in O(n)
clrs; exercise 8.3.5 - time/space in bad radixsort
clrs; git hook for generating a commit message

If only files from a single exercise or problem are staged, the commit
message will be prepopulated.