Include optimal and best known solution values into the grader, so that we can check if the optimality flag is set incorrectly. See the discussion here, https://www.coursera.org/learn/discrete-optimization/discussions/all/threads/PXqI_D_EEeeTwg79SJkWhg
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ccoffrin commentedon May 25, 2017
Another option would be to remove the optimality flag entirely.