## 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

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

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'”

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

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

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

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?

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

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?

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

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?

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?

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

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

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

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

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

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?

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]

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