c++ - Dynamic Programming Problem -

-

well, don't need code itself, understanding trying in order write code. in nutshell, given 1000 projects each set of resources, , have (set ammount) of resources utilize calculate best projects can pick.

the pseudocode bestprofit function follows:

bestprofit:

parameters -              projects: vector of projects             r:        resources available solve subinstance              valuemap: map data structure used memoization             n:        projects numbered 0,...,n-1 may                        used solve subinstance returns -   maximum amount of profit may obtained on            subinstance of optimization problem post-condition – if n > 0, valuemap contains entry                  key (r, n). 
if n equals 0      return 0 check valuemap see whether subinstance has been solved -   if so, return computed result (function terminates) best1 = bestprofit(projects, r, valuemap, n-1) check whether r provides enough resources undertake project n-1 -   if so, best2 = bestprofit(projects, r – projects[n-1].requirements, valuemap, n-1)  + projects[n-1].profit  else      best2 = 0  if best1 >= best2    store (r, n) -> (best1, false) in valuemap    return best1 else    store (r, n) -> (best2, true) in valuemap    return best2

when recursive call bestprofit, best1 supposed check if subproblem has been resolved. , best2, considered feasibility check based on last project. in other words looks balanced tree. unable understand how insert values on map during recursion? final if/else statement won't happen until whole set of projects has been traversed. , final value gets inserted on map. want pointers on how should approach write recursion correctly.

like said before not looking code way understand requirements of pseudo code project in c++. logic driving me crazy @ point because can't put work. thank looking @ , providing better insight if possible.

i'd return data structure indicates both profit , solution gets profit. store exact data structure in valuemap. make code more straightforward.

basically, "write correct recursive solution. add memoization make fast."


Comments

Post a Comment

Popular posts from this blog

objective c - Change font of selected text in UITextView -

-
can suggest me how change font of selected text in uitextview.i cannot use uiwebview since have edit text. have seen pages app.how possible in app. see formatting text within uilabel differently . since need editing, should @ javascript-based editors such ckeditor or tinymce . highly recommend wwdc 2011 video session 511: "rich text editing in safari on ios."
Read more

php - Accessing POST data in Facebook cavas app -

-
so i've got simple form in canvas / iframe facebook app, , i'm trying pass along values post. reading on s.o. , fb's latest docs, understand it, data send via post form can accessed on receiving end $_request object. i read on thread on s.o. in order post forms work need pass along input named "signed_request" value current signed_request (i have signed request working ok otherwise...all login , authentication stuff working fine). isnt mentioned anywhere in official fb docs. so problem comes in $_request object signed request, , bunch of other session stuff. form inputs found. the way can read them set method of form "request" isn't real form method. takes of inputs , sends them args in url. horrible. here's sample page canvas app form i'm using try debug (leaving out authentication stuff): <form enctype="application/x-www-form-urlencoded" method="post" target="_top" id="my_form" action=...
Read more

c# - Getting control value when switching a view as part of a multiview -

-
i have following code in aspx page: <asp:button id="display_button" runat="server" text="display" onclick="button1_click" /> &nbsp; <asp:button id="edit_button" runat="server" text="edit" onclick="button2_click" /> &nbsp; <asp:button id="save_button" runat="server" text="save" onclick="button3_click" visible="false" /> &nbsp; <asp:multiview id="multiview1" runat="server" activeviewindex="0"> <asp:view id="view1" runat="server"> <asp:formview id="view_program" runat="server"> <itemtemplate> <%# eval("status").tostring().trim() %> </itemtemplate> </asp:formview> </asp:view> <asp:view id="view2" runat="server"> ...
Read more