You are given an integer array prices where prices[i] is the price of a given stock on the ith day.
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 sell and buy the stock multiple times on the same day, ensuring you never hold than one share of the stock.
\n\nFind and return the maximum profit you can achieve.
\n\n\n
Example 1:
\n\n\nInput: prices = [7,1,5,3,6,4]\nOutput: 7\nExplanation: Buy on day 2 (price = 1) and sell on day 3 (price = 5), profit = 5-1 = 4.\nThen buy on day 4 (price = 3) and sell on day 5 (price = 6), profit = 6-3 = 3.\nTotal profit is 4 + 3 = 7.\n\n\n
Example 2:
\n\n\nInput: prices = [1,2,3,4,5]\nOutput: 4\nExplanation: Buy on day 1 (price = 1) and sell on day 5 (price = 5), profit = 5-1 = 4.\nTotal profit is 4.\n\n\n
Example 3:
\n\n\nInput: prices = [7,6,4,3,1]\nOutput: 0\nExplanation: There is no way to make a positive profit, so we never buy the stock to achieve the maximum profit of 0.\n\n\n
\n
Constraints:
\n\n1 <= prices.length <= 3 * 1040 <= prices[i] <= 104给你一个整数数组 prices ，其中 prices[i] 表示某支股票第 i 天的价格。
在每一天，你可以决定是否购买和/或出售股票。你在任何时候 最多 只能持有 一股 股票。然而，你可以在 同一天 多次买卖该股票，但要确保你持有的股票不超过一股。
\n\n返回 你能获得的 最大 利润 。
\n\n\n\n
示例 1：
\n\n\n输入：prices = [7,1,5,3,6,4]\n输出：7\n解释：在第 2 天（股票价格 = 1）的时候买入，在第 3 天（股票价格 = 5）的时候卖出, 这笔交易所能获得利润 = 5 - 1 = 4。\n随后，在第 4 天（股票价格 = 3）的时候买入，在第 5 天（股票价格 = 6）的时候卖出, 这笔交易所能获得利润 = 6 - 3 = 3。\n最大总利润为 4 + 3 = 7 。\n\n
示例 2：
\n\n\n输入：prices = [1,2,3,4,5]\n输出：4\n解释：在第 1 天（股票价格 = 1）的时候买入，在第 5 天 （股票价格 = 5）的时候卖出, 这笔交易所能获得利润 = 5 - 1 = 4。\n最大总利润为 4 。\n\n
示例 3：
\n\n\n输入：prices = [7,6,4,3,1]\n输出：0\n解释：在这种情况下, 交易无法获得正利润，所以不参与交易可以获得最大利润，最大利润为 0。\n\n
\n\n
提示：
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