{ "data": { "question": { "questionId": "122", "questionFrontendId": "122", "categoryTitle": "Algorithms", "boundTopicId": 1093, "title": "Best Time to Buy and Sell Stock II", "titleSlug": "best-time-to-buy-and-sell-stock-ii", "content": "

You are given an integer array prices where prices[i] is the price of a given stock on the ith day.

\n\n

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.

\n\n

Find 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\n\n", "translatedTitle": "买卖股票的最佳时机 II", "translatedContent": "

给定一个数组 prices ，其中 prices[i] 表示股票第 i 天的价格。

\n\n

在每一天，你可能会决定购买和/或出售股票。你在任何时候 最多 只能持有 一股 股票。你也可以购买它，然后在 同一天 出售。
\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
\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     注意你不能在第 1 天和第 2 天接连购买股票，之后再将它们卖出。因为这样属于同时参与了多笔交易，你必须在再次购买前出售掉之前的股票。\n
\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, 没有交易完成, 所以最大利润为 0。
\n\n

 

\n\n

提示：

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