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Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
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Here's a summary of Dimitris Andreou's link.
Remember sum of i-th powers, where i=1,2,..,k. This reduces the problem to solving the system of equations
a1 + a2 + ... + ak = b1
a12 + a22 + ... + ak2 = b2
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a1k + a2k + ... + akk = bk
Using Newton's identities, knowin...
How to define a preprocessor symbol in Xcode
... the bottom left, and select "Add User-Defined Setting". The new setting name should be GCC_PREPROCESSOR_DEFINITIONS, and you can type your definitions in the right-hand field.
Per Steph's comments, the full syntax is:
constant_1=VALUE constant_2=VALUE
Note that you don't need the '='s if you ju...
How to make UIButton's text alignment center? Using IB
... what you were expecting:
Objective-C:
[myButton.titleLabel setTextAlignment:UITextAlignmentCenter];
For iOS 6 or higher it's
[myButton.titleLabel setTextAlignment: NSTextAlignmentCenter];
as explained in tyler53's answer
Swift:
myButton.titleLabel?.textAlignment = NSTextAlignment.Center...
mongodb, replicates and error: { “$err” : “not master and slaveOk=false”, “code” : 13435 }
I tried mongo replica sets for the first time.
7 Answers
7
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How to create a Menubar application for Mac
EDIT: This is a nice ready-made menubar application here ( github source ) by this answer .
6 Answers
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iOS application: how to clear notifications?
I've an iOS application where some Push Notification are sent to. My problem is, that the messages/notifications stays in the Notification Center in iOS after then are tapped. How can I remove a notification for my application in the Notification Center next time the application opens?
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jQuery get value of select onChange
...elect input by doing this $(this).val(); and applying the onchange parameter to the select field.
16 Answers
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how to edit .csproj file
When I am compiling my .csproj file using .NET framework 4.0 MSBUILD.EXE file I am getting an error "lable01" not found in the current context of "website01.csproj"
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How do I read a text file of about 2 GB? [duplicate]
I have a .txt file whose memory is more than 2 GB. The problem is I cannot open it with Notepad, Notepad++ or any other editor programs.
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Get the position of a div/span tag
Can someone show me how to get the top & left position of a div or span element when one is not specified?
6 Answer...