Best Time to Buy and Sell Stock II

Input: prices = [7,1,5,3,6,4]

Output: 7

Buy on day 2 (price = 1) and sell on day 3 (price = 5), profit = 5 - 1 = 4. Then buy on day 4 (price = 3) and sell on day 5 (price = 6), profit = 6 - 3 = 3. Total profit is 4 + 3 = 7.

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. Equivalently, you could buy and sell every consecutive day for the same total profit.

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

Output: 0

There is no way to make a positive profit, so we never buy the stock to achieve the maximum profit of 0.

Best Time to Buy and Sell Stock II

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