The problem states that "Any wife who can prove that her husband is unfaithful must kill him that very day." There's no requirement that a wife must kill her h

The problem states that "Any wife who can prove that her husband is unfaithful must kill him that very day." There's no requirement that a wife must kill her husband as soon as she knows; she can postpone it at least to midnight, if she felt so inclined. Since a woman can't be sure that any other woman is planning a killing until the next day, the massacre takes place on the 100th day, not immediately.