# =-=-=-= DAY 32 [Hard] =-=-=-=
#
# Suppose you are given a table of currency exchange rates, represented as a 2D
# array. Determine whether there is a possible arbitrage: that is, whether there
# is some sequence of trades you can make, starting with some amount A of any
# currency, so that you can end up with some amount greater than A of that
# currency.
# 
# There are no transaction costs and you can trade fractional quantities.
