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How do you rotate a two dimensional array?
Inspired by Raymond Chen's post , say you have a 4x4 two dimensional array, write a function that rotates it 90 degrees. Raymond links to a solution in pseudo code, but I'd like to see some real world stuff.
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Why Collections.sort uses merge sort instead of quicksort?
We know that quick sort is the fastest sorting algorithm.
1 Answer
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How would you count occurrences of a string (actually a char) within a string?
I am doing something where I realised I wanted to count how many / s I could find in a string, and then it struck me, that there were several ways to do it, but couldn't decide on what the best (or easiest) was.
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Best Practices: working with long, multiline strings in PHP?
Note: I'm sorry if this is an extremely simple question but I'm somewhat obsessive compulsive over the formatting of my code.
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What are the applications of binary trees?
I am wondering what the particular applications of binary trees are. Could you give some real examples?
17 Answers
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Append an object to a list in R in amortized constant time, O(1)?
If I have some R list mylist , you can append an item obj to it like so:
17 Answers
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Create list of single item repeated N times
I want to create a series of lists, all of varying lengths. Each list will contain the same element e , repeated n times (where n = length of the list).
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Multiple simultaneous downloads using Wget?
I'm using wget to download website content, but wget downloads the files one by one.
15 Answers
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Finding three elements in an array whose sum is closest to a given number
Given an array of integers, A 1 , A 2 , ..., A n , including negatives and positives, and another integer S. Now we need to find three different integers in the array, whose sum is closest to the given integer S. If there exists more than one solution, any of them is ok.
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How to implement a queue using two stacks?
Suppose we have two stacks and no other temporary variable.
20 Answers
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