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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
I've been profiling some of our core math on an Intel Core Duo, and while looking at various approaches to square root I've noticed something odd: using the SSE scalar operations, it is faster to take a reciprocal square root and multiply it to get the sqrt, than it is to use the native sqrt opcode!...
Write a function that returns the longest palindrome in a given string
I thought of a solution but it runs in O(n^2) time
22 Answers
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How to fix Array indexOf() in JavaScript for Internet Explorer browsers
If you have worked with JavaScript at any length you are aware that Internet Explorer does not implement the ECMAScript function for Array.prototype.indexOf() [including Internet Explorer 8]. It is not a huge problem, because you can extend the functionality on your page with the following code.
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How to find all combinations of coins when given some dollar value
I found a piece of code that I was writing for interview prep few months ago.
35 Answers
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Way to go from recursion to iteration
I've used recursion quite a lot on my many years of programming to solve simple problems, but I'm fully aware that sometimes you need iteration due to memory/speed problems.
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Generate all permutations of a list without adjacent equal elements
When we sort a list, like
12 Answers
12
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recursion versus iteration
Is it correct to say that everywhere recursion is used a for loop could be used? And if recursion is usually slower what is the technical reason for ever using it over for loop iteration?
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LINQ with groupby and count
This is pretty simple but I'm at a loss:
Given this type of data set:
3 Answers
3
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What is tail recursion?
Whilst starting to learn lisp, I've come across the term tail-recursive . What does it mean exactly?
28 Answers
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Difference between >>> and >>
What is the difference between >>> and >> operators in Java?
7 Answers
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