Abstract
Two examples are presented. The first example is “bad” for a large subset of the “primal” minimum cost flow algorithms, namely those algorithms which start with the required amount ofs − t flow distributed in a feasible, but nonoptimal manner, and which get optimal by sending flow about negative cycles. In particular, the example is bad for the “primal” method which always sends flow about a cycle which yields the largest decrease in the objective function.
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