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Andrei Dragus told me this cute puzzle a year or two ago.
M marbles are placed in N cups arranged in a circle. One move consists in choosing a cup, taking all the marbles within that cup and placing them one by one in the following cups in clockwise order (since the cups are in a circle you might end up putting marbles in the original cup as well).
M marbles are placed in N cups which are arranged in a circle. One move consists in choosing a cup, taking all the marbles within that cup and placing them one by one in the following cups in clockwise order (since the cups are in a circle you might end up putting marbles in the original cup as well).
How can we tell given two placements A and B of marbles in cups, if we can reach B starting from A.
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