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    If I'm wrong, please alert me but Calculations in the explanation section are given wrong. The following calculations must be 3 but they were calculated as 4:

    (3, 3) (1, 1) (2, 1) ==> cost = 0 + 2 + 2 = 4 (3, 3) (2, 1) (1, 1) ==> cost = 0 + 2 + 2 = 4

    am I doing an error?