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Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
.... + ak2 = b2
...
a1k + a2k + ... + akk = bk
Using Newton's identities, knowing bi allows to compute
c1 = a1 + a2 + ... ak
c2 = a1a2 + a1a3 + ... + ak-1ak
...
ck = a1a2 ... ak
If you expand the polynomial (x-a1)...(x-ak) the coefficients will be exactly c1, ..., ck - see Viète's formulas. Si...
What is “2's Complement”?
...ition and subtraction remains difficult.
So along comes two's complement. Now you can store positive and negative integers and perform arithmetic with relative ease. There are a number of methods to convert a number into two's complement. Here's one.
Convert Decimal to Two's Complement
Convert t...
Parse usable Street Address, City, State, Zip from a string [closed]
...cademic to write it, there's no weirdness, just lots of string handling.
(Now that you've posted some sample data, I've made some minor changes)
Work backward. Start from the zip code, which will be near the end, and in one of two known formats: XXXXX or XXXXX-XXXX. If this doesn't appear, you ca...
How well is Unicode supported in C++11?
...le to focus on an encoding that was superseded over 20 years ago, I don't know‡. It's not like support for more encodings is bad or anything, but UCS-2 shows up too often here.
I would say that char16_t is obviously meant for storing UTF-16 code units. However, this is one part of the s...
Multiple glibc libraries on a single host
...of glibc on the same system (we do that every day).
However, you need to know that glibc consists of many pieces (200+ shared libraries) which all must match. One of the pieces is ld-linux.so.2, and it must match libc.so.6, or you'll see the errors you are seeing.
The absolute path to ld-linux.so....
How to install 2 Anacondas (Python 2 and 3) on Mac OS
...ode (for c++ compiler) and Anaconda with the latest Python 3 (for myself). Now I'm wondering how to install properly second Anaconda (for work) with Python 2?
...
Error when trying vagrant up
...
Gar, that was it. Why does it say "You are now ready to vagrant up your first virtual environment!" then??
– Matt
Jun 30 '15 at 21:55
...
What are attributes in .NET?
...environment. For example the Windows Designer uses them extensively so it knows how to deal with custom made objects. Using the BrowsableAttribute like so:
[Browsable(false)]
public SomeCustomType DontShowThisInTheDesigner
{
get{/*do something*/}
}
Tells the designer not to list this in the a...
Why is f(i = -1, i = -1) undefined behavior?
...Then this:
f(i=-1, i=-1)
might become:
clear i
clear i
decr i
decr i
Now i is -2.
It is probably a bogus example, but it is possible.
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Java String remove all non numeric characters
...de:
String str = "a12.334tyz.78x";
str = str.replaceAll("[^\\d.]", "");
Now str will contain "12.334.78".
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