Recent questions tagged algorithm

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algorithm - Given Prime Number N, Compute the Next Prime?

A coworker just told me that the C# Dictionary collection resizes by prime numbers for arcane reasons relating to ... the next prime number? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - How to calculate the entropy of a file?

How to calculate the entropy of a file? (Or let's just say a bunch of bytes) I have an idea, but I'm ... markup, compressed or some binary, ...) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Box stacking problem

I found this famous dp problem in many places, but I can not figure out how to solve. You are given a ... someone explain the solution easy way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Smoothing data from a sensor

I have a 3D sensor which measures v(x,y,z) data. I'm only using the x and y data. Smoothing only x and ... so I need to build my own function. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Undo/Redo implementation

Give me some thoughts how to implement undo/redo functionality - like we have in text editors. What algorithms should ... I may read. thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Why DFS and not BFS for finding cycle in graphs

Predominantly DFS is used to find a cycle in graphs and not BFS. Any reasons? Both can find if a node ... while traversing the tree/graph. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Combined area of overlapping circles

I recently came across a problem where I had four circles (midpoints and radius) and had to calculate the area of ... is more than two circles? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - How to cartoon-ify an image programmatically?

My app works with photos and videos of people, which I want to cartoonify. So I need an algorithm to do it ... and use from our own app. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Implement Stack using Two Queues

A similar question was asked earlier there, but the question here is the reverse of it, using two queues as a ... ,c#,python,vb,javascript,php). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - What is a loop invariant?

I'm reading "Introduction to Algorithm" by CLRS. In chapter 2, the authors mention "loop invariants". What is a loop invariant? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - What are the differences between segment trees, interval trees, binary indexed trees and range trees?

What are differences between segment trees, interval trees, binary indexed trees and range trees in terms of: ... not just give definitions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - PHP take all combinations

I saw this algorithm that will take numbers or words and find all possible combinations And I'm using it, but it ... cat cat dog dog fish fish See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - C# hashcode for array of ints

I have a class that internally is just an array of integers. Once constructed the array never changes. I'd like ... -1000 and 1000 in general. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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392 views

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algorithm - Argument for O(1) average-case complexity of heap insertion

The claim on the Wikipedia page for binary heaps is that insertion is O(log n) in the worst case, but O( ... on Wikipedia for several months... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - How to generate a random permutation in Java?

What is the best way to generate a random permutation of n numbers? For example, say I have a set of ... them randomly? Please assist. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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731 views

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algorithm - How to check if line segment intersects a rectangle?

If you have 2 points, (x1, y1) and (x2, y2), which represent two opposite corners of a rectangle, and 2 ... line defined by those two points.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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576 views

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algorithm - How to partition an array of integers in a way that minimizes the maximum of the sum of each partition?

The inputs are an array A of positive or null integers and another integer K. We should partition A into K blocks ... is no bigger than 10'000 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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640 views

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algorithm - How can I generate all permutations of an array in Perl?

What's the best (elegant, simple, efficient) way to generate all n! permutations of an array in perl? For example, if ... ) ){ print "@perm "; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - In-place array reordering?

Let's say I have an array a of length n and a second array indices, also of length n. indices ... time, preferably without mutating indices? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Find all subsets of length k in an array

Given a set {1,2,3,4,5...n} of n elements, we need to find all subsets of length k . For example, ... implementation in either C/C++ or Java. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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521 views

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algorithm - What is the fastest way to find the closest point to a given point?

What is the fastest way to find closest point to the given point in data array? For example, suppose I ... auxiliary data structure is possible. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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601 views

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algorithm - Finding the median of an unsorted array

To find the median of an unsorted array, we can make a min-heap in O(nlogn) time for n elements, and ... please tell or suggest some method. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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439 views

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algorithm - reconstructing a tree from its preorder and postorder lists

Consider the situation where you have two lists of nodes of which all you know is that one is a representation of ... there is only one child. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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610 views

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algorithm - Smooth spectrum for Mandelbrot Set rendering

I'm currently writing a program to generate really enormous (65536x65536 pixels and above) Mandelbrot images, and I' ... isn't too obvious. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Efficiently reverse the order of the words (not characters) in an array of characters

Given an array of characters which forms a sentence of words, give an efficient algorithm to reverse the order of ... puzzle is taken from here. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Circle-circle intersection points

How do I calculate the intersection points of two circles. I would expect there to be either two, one ... working algorithm would be acceptable. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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439 views

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algorithm - Hashing a Tree Structure

I've just come across a scenario in my project where it I need to compare different tree objects for ... possible improvements would be welcome. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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660 views

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algorithm - Calculate largest rectangle in a rotated rectangle

I'm trying to find the best way to calculate the biggest (in area) rectangle which can be contained inside a rotated ... edges. (Thanks to Mr E) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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