A company plans a viral marketing strategy in which an existing customer will invite N other new customers every day for D days. At the end of the Dth day, a customer will get a gift and must leave (the left customers will not invite any new customers on
A company plans a viral marketing strategy in which an existing customer will invite N other new customers every day for D days. At the end of the Dth day, a customer will get a gift and must leave (the left customers will not invite any new customers on
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