PROBLEM $2$

$(10$ Points$)$ This problem is the same as #$1,$ except you may complete as many buy$/$sell orders as you have to in a given time slice AND you must sell one before you can buy another $($except for the very first buy order$).$

Write the following function taking in an integer vector $($vector$\{1,2,4\}$$$1$$$2$$$2$$$4=>$$$1+$$$2=$$$3\{4,2,1\}=>$$$0\{1\}$$$1$

note on output: buy $$1,$ sell $$5,$ buy $$2,$ sell $$4=$$$4+$$$2=$$$6$ profit

STARTER CODE