# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh@octave.org>
# Date 1426084215 14400
# Node ID cd24a8027d5fe7e6ae864a1cbc391b087c00345b
# Parent  14c8b6dad88a07db55bfd884293fbd4e1eaf863b
parseinput: skip impossible and unprofitable machines

diff --git a/optim.py b/optim.py
--- a/optim.py
+++ b/optim.py
@@ -20,9 +20,17 @@
             for i in range(0, N):
                 machine = Machine(*[int(x) for x in f.readline().split()],
                                   maxprofit = None)
+
                 # Maximum profit possible from each machine
                 maxprofit = ((case.days - machine.day)*machine.profit
                              - machine.buy + machine.sell)
+
+                # Skip machines that can only give a loss. This
+                # includes machines that can only be bought after
+                # case.days.
+                if maxprofit < 0:
+                    continue
+
                 machine = machine._replace(maxprofit = maxprofit)
                 case.machines.append(machine)