Leetcode 123. Best Time to Buy and Sell Stock III

Given daily stock prices, find the maximum profit achievable with at most two non-overlapping buy-sell transactions (you must sell before buying again). Expect to exploit the two-transaction structure (e.g., split the timeline or use DP on transaction states) and aim for an O(n) solution since n can be up to 1e5.

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Leetcode 123. Best Time to Buy and Sell Stock III

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