Can we buy and sell something in the same day?

  • 0

    my question is can an item be the sell of the previous transaction, and at the same time the buy of another one?

  • 1

    you can, it's just like you wasted one chance of transaction. For example, if you bought on Day 1 and sell on Day 5 and bought on Day 5 and sell on Day 10. Profit is P5 - P1 + P10 - P5. It has the same profit as bought on day 1 and sell on day 10(P10 - P1). So it is like that the problem ask you to make at most 2 transactions and you only did one.

  • 0

    It says at most k transaction, so a better thing would be to simply skip that transaction as there can be less than k transactions.

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