Best Time to Buy and Sell Stock using Strategy

Description

You are given two integer arrays prices and strategy, where:

- prices[i] is the price of a given stock on the ith day.

- strategy[i] represents a trading action on the ith day, where:


- -1 indicates buying one unit of the stock.

- 0 indicates holding the stock.

- 1 indicates selling one unit of the stock.





You are also given an even integer k, and may perform at most one modification to strategy. A modification consists of:

- Selecting exactly k consecutive elements in strategy.

- Set the first k / 2 elements to 0 (hold).

- Set the last k / 2 elements to 1 (sell).

The profit is defined as the sum of strategy[i] * prices[i] across all days.

Return the maximum possible profit you can achieve.

Note: There are no constraints on budget or stock ownership, so all buy and sell operations are feasible regardless of past actions.