Compute Stock Profit with One or Unlimited Transactions

Problem

Given daily stock prices, return two values: the maximum profit when at most one buy-sell transaction is allowed, and the maximum profit when any number of non-overlapping transactions is allowed. You may hold at most one share at a time, and a sale must occur after its corresponding purchase.

Constraints & Assumptions

• The price list contains between 1 and 200,000 positive integers.
• Prices fit in 32-bit signed integers; use 64-bit arithmetic for total profit.
• Buying and selling on the same day adds no profit and is unnecessary.
• Return zero for a strategy that cannot make a positive profit.

Clarifications

• There are no fees, cooldown periods, or limits beyond the one-share holding rule.
• Unlimited transactions cannot overlap, but a new buy may follow an earlier sale.
• Return [oneTransactionProfit, unlimitedTransactionsProfit].

Examples

prices = [7, 1, 5, 3, 6, 4]
output = [5, 7]

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