Best Time to Buy and Sell Stock III

Input: prices = [3,3,5,0,0,3,1,4]

Output: 6

Buy on day 4 (price = 0) and sell on day 6 (price = 3), profit = 3-0 = 3. Then buy on day 7 (price = 1) and sell on day 8 (price = 4), profit = 4-1 = 3. Total profit = 6.

Input: prices = [1,2,3,4,5]

Output: 4

Buy on day 1 (price = 1) and sell on day 5 (price = 5), profit = 5-1 = 4. Even though we're allowed two transactions, one transaction achieves the maximum profit here.

Input: prices = [7,6,4,3,1]

Output: 0

Prices only decrease, so no profitable transaction is possible. Return 0.

Best Time to Buy and Sell Stock III

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