https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iii/discuss/39690/A-solution-not-so-dynamic-programming.  https://www.interviewbit.com/problems/best-time-to-buy-and-sell-stocks-iii/
https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iii/discuss/39690/A-solution-not-so-dynamic-programming.
https://www.interviewbit.com/problems/best-time-to-buy-and-sell-stocks-iii/