122. Best Time to Buy and Sell Stock II

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You are given an integer array `prices`

where `prices[i]`

is the price of a given stock on the `i`

day.^{th}

On each day, you may decide to buy and/or sell the stock. You can only hold **at most one** share of the stock at any time. However, you can buy it then immediately sell it on the **same day**.

Find and return *the maximum profit you can achieve*.

**Example 1:**

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

**Example 2:**

Input:prices = [1,2,3,4,5]Output:4Explanation:Buy on day 1 (price = 1) and sell on day 5 (price = 5), profit = 5-1 = 4. Total profit is 4.

**Example 3:**

Input:prices = [7,6,4,3,1]Output:0Explanation:There is no way to make a positive profit, so we never buy the stock to achieve the maximum profit of 0.

**Constraints:**

`1 <= prices.length <= 3 * 10`

^{4}`0 <= prices[i] <= 10`

^{4}

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