Goldmine:

N(<=100) goldmines are given. c_i is the cost of buying the license to 
mine
in the i-th goldmine. u_i is the amount of gold in the i-th mine and 
v_i is
the price of mining one unit of gold in the i-th mine. Using these 
mines you
would like to mine T(<=10,000) unit of gold. Determine the least amount 
of
money you need.
