All possible binary trees given only one traversal

All possible binary trees given only one traversal
Given an inorder traversal only (or postorder/preorder only) traversal of a binary tree (not necessarily a BST), how does one code to generate all possible binary trees given this traversal?I understand that the number of binary trees possible given

change the image doesnt work

change the image doesnt work
here is my javasript:$(function() { $(".image2").click(function() { var image = $(this).attr("rel"); $('#random_img').hide(); $('#random_img').fadeIn('slow'); $('#random_img').attr('src') == image; var image2 = $('#random_img').attr('s

Django 1.7 makemigrations not working - has no column named

Django 1.7 makemigrations not working - has no column named
I can't figure out why my makemigrations isn't working with sqlite. When I add the column userphoto and go to make migrations, I receive an error message "table categories_Category has no column named userphoto"python 3.4, django 1.7, only added

python installation “cc1.exe: error: unrecognized command line option '-mno-cygwin'”

python installation “cc1.exe: error: unrecognized command line option '-mno-cygwin'”
Hi guys i'm trying to install rrdtool (for PYTHON 2.7) on my windows 7 system , i install it using this command line.python setup.py install build --compiler=mingw32it gives me the following output:running install running build running build_ext runn

Explanation of assembly generated by NASM for dd

Explanation of assembly generated by NASM for dd
I've been experimenting with assembly in Linux with NASM, so that I could understand theloader.s script on OSDev.One thing that I found interesting was the assembly generated when a variable was declared with dd. I ran some tests and I've put the out

AS3 Flash change combobox value cause keydown events are disabled

AS3 Flash change combobox value cause keydown events are disabled
I'm using Flash Pro CS6.I created a fla project and put in a ComboBox. Then i place following code in action:import flash.events.KeyboardEvent; this.stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown); this.stage.addEventListener(KeyboardEvent.

C-Execvp() always fails

C-Execvp() always fails
i'm trying to make a shell in c and currently trying the ls command but the child always returns thatexecvpcouldn't work. here is the function.first i get the path i'm in and the command i get fromstdinusing exec that is why i remove the newline afte

Java: Partially applied generic classes - how to eliminate redundant type parameters?

Java: Partially applied generic classes - how to eliminate redundant type parameters?
In my Java application I created methods that returnEither<A, B>objects.However the type I really use isEither<String, T>, i.e.Stringis always the left type parameter, while the right parameter can be any type.Here is thefunctionaljavaEitherim

Need help regarding how to implent this..choosing a best data structure

Need help regarding how to implent this..choosing a best data structure
i want to analyze a combinational digital circuit. An ASCII file contains the description of the circuit, according to the following format:<name> <logic gate> <inputs> <outputs> <input 1>-<last input> <output> &l

How to parse varying amounts of lines from a text file in Python?

How to parse varying amounts of lines from a text file in Python?
I'm trying to write a simple parser that grabs multiline blocks of text from one .txt file and copies it to a new .txt file. Why (I think) my problem differs from similar questions posted on-line is that the number of lines varies depending on the bl

Bootstrap dropdowns menus appearing behind other elements - IE7

Bootstrap dropdowns menus appearing behind other elements - IE7
I'm using Bootstrap 2.3.1http://twitter.github.io/bootstrap/index.htmlSo I'm using their 'dropdown-menu' class to create some simple quick use dropdown menus, but for some reason onIE7they are appearing behind text and other elements on my site.Test

how to force model.matrix to use all levels of 2 categorical variables?

how to force model.matrix to use all levels of 2 categorical variables?
DescriptionI have 2 categorical variables and I want to turn them into columns - for each category exactly one columnProgressSimple code to achive this:d.data <- data.frame(a=as.factor(c("some1","some2","some3")), b = as.f

How to determine if a file descriptor is seekable?

How to determine if a file descriptor is seekable?
Is there any portable way (on POSIX systems) to determine if a file descriptor is seekable? My thought is to uselseek(fd, 0, SEEK_CUR);and check if the return value is -1, but I'm uncertain if this could give false negatives or false positives. Using

Deleting a line from a txt file in objective-c

Deleting a line from a txt file in objective-c
Is there a way to remove a line from the end of a .txt file from Objective-C? I can't seem to find anything on manipulating text files from Objective-C, only reading them into a NSString.Have you considered changing your data model to a plist? Plists

Most elegant way to modify elements of nested lists in place

Most elegant way to modify elements of nested lists in place
I have a 2D list that looks like this:table = [['donkey', '2', '1', '0'], ['goat', '5', '3', '2']]I want to change the last three elements to integers, but the code below feels very ugly:for row in table: for i in range(len(row)-1): row[i+1] = int(ro

MySql Explain ignoring the unique index in a particular query

MySql Explain ignoring the unique index in a particular query
I started looking into Index(es) in depth for the first time and started analyzing our db beginning from the users table for the first time. I searched SO to find a similar question but was not able to frame my search well, I guess.I was going throug

Rails3 fails validation and loses child fields

Rails3 fails validation and loses child fields
I have a form that prompts for a job and job_files to attach. When the job save fails due to validation, the selected job_files disappear when the form redisplays. How do I retain the child fields? All parent fields are retained in the form but the c

Magento2 changes

Magento2 changes
Hi I am new inMagento 2and I want to know where I have to put thevendor/magento/module-theme/view/frontend/layout/default.xmlfile, I tried to copy the file and put it inc:\wamp\www\kk2\app\design\frontend\Magento\MyStore\layoutfolder and is not worki

Deep null checking, is there a better way?

Deep null checking, is there a better way?
Note:This question was asked before the introduction ofthe.?operator in C# 6 / Visual Studio 2015.We've all been there, we have some deep property like cake.frosting.berries.loader that we need to check if it's null so there's no exception. The way t

Wordpress uploads error - is not writing to database [closed]

Wordpress uploads error - is not writing to database [closed]
I've recently moved my WordPress blog from one server to another, changing the URL paths. I decided to use a subdomain for images and uploads.After I upload an image I get this error:"An error occurred in the upload. Please try again later."I ch
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