CLRS | : notebook : Solutions to Introduction to Algorithms | Machine Learning library

by gzc C++ Version: Current License: MIT

X-Ray Key Features Code Snippets(1)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | CLRS Summary

CLRS is a C++ library typically used in Artificial Intelligence, Machine Learning, Pytorch applications. CLRS has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Solutions to Introduction to Algorithms by Charles E. Leiserson, Clifford Stein, Ronald Rivest, and Thomas H. Cormen (CLRS).

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Support

CLRS has a medium active ecosystem.

It has 9001 star(s) with 2753 fork(s). There are 388 watchers for this library.

It had no major release in the last 6 months.

There are 63 open issues and 65 have been closed. On average issues are closed in 51 days. There are 21 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of CLRS is current.

Quality

CLRS has 0 bugs and 0 code smells.

Security

CLRS has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

CLRS code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

CLRS is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

CLRS releases are not available. You will need to build from source code and install.

It has 1460 lines of code, 143 functions and 27 files.

It has high code complexity. Code complexity directly impacts maintainability of the code.

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CLRS Key Features

No Key Features are available at this moment for CLRS.

CLRS Examples and Code Snippets

Finds optimal binary search tree .

python

Lines of Code : 67

License : Permissive (MIT License)

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def find_optimal_binary_search_tree(nodes):
    """
    This function calculates and prints the optimal binary search tree.
    The dynamic programming algorithm below runs in O(n^2) time.
    Implemented from CLRS (Introduction to Algorithms) book.

Community Discussions

Trending Discussions on CLRS

Max subarray sum in CLRS (3rd edition) resulting in error

Java PriorityQueue: how to heapify a Collection with a custom Comparator?

Mergesort resulting in error in CLRS (3rd edition)

Merge Sort using sentinels in C# produces weird outputs

ItemTouchHelper - Can't scroll RecyclerView, Swipe doesn't work

How do I write this pseudocode in C++? Function returns two arrays to two initialized arrays

How to make X axis wider in foresplot

I am trying to make a color game in react but always end up with diffrent colors

The interpretation of expected time bound for searches in a hash table

How can a never-ending recursive function have a time complexity?

QUESTION

Max subarray sum in CLRS (3rd edition) resulting in error

Asked 2022-Mar-27 at 18:07

This is a continuation to my early complaints about CLRS(3rd edition) if you're looking to learn about algorithms, this is by far the worst book that you can ever use. All the pseudocode examples up to chapter 4 that I've seen so far have mistakes ranging from off by one, wrong/missing base cases for recursive functions, poor design choices that require complete redesign ex: the use of sentinel values in merge sort which is addressed in my other question I mentioned earlier. This book is overhyped and is plain garbage.

In the example shown below, the objective is to find a contiguous subarray with the largest sum.

ex: [13, -3, -25, 20, -3, -16, -23, 18, 20, -7, 12, -5, -22, 15, -4, 7]

sequence: 18, 20, -7, 12: 43

ex: [4, 5]

sequence: 4, 5: 9

...

ANSWER

Answered 2022-Mar-27 at 18:07

The code given by the book treats low and high as inclusive indices. So firstly your call to the method should be

Source https://stackoverflow.com/questions/71638737

QUESTION

Java PriorityQueue: how to heapify a Collection with a custom Comparator?

Asked 2022-Mar-10 at 03:24

For example, given a List of Integer List list = Arrays.asList(5,4,5,2,2), how can I get a maxHeap from this List in O(n) time complexity?

The naive method:

...

ANSWER

Answered 2021-Aug-28 at 15:09

If you don't mind some hack

According to the java doc of PriorityQueue(PriorityQueue)

Creates a PriorityQueue containing the elements in the specified priority queue. This priority queue will be ordered according to the same ordering as the given priority queue.

So we can extend PriorityQueue as CustomComparatorPriorityQueue to hold the desired comparator and the Collection we need to heapify. Then call new PriorityQueue(PriorityQueue) with an instance of CustomComparatorPriorityQueue.

Below is tested to work in Java 15.

Source https://stackoverflow.com/questions/68960310

QUESTION

Mergesort resulting in error in CLRS (3rd edition)

Asked 2022-Mar-02 at 10:01

According to CLRS(3rd edition) ch2 pages 31-34, here's the pseudocode and respective code for merge and merge_sort.

...

ANSWER

Answered 2022-Mar-02 at 10:01

There are multiple problem in the transposition from the pseudo code to python code:

in the pseudocode for i = 1 to n₁, n₁ is included, so you should use range(1, n1 + 1)
same remark for for k = p to r, use range(p, r + 1)
the algorithm uses infinite guard values (∞), a mathematical concept that does not fare well in code. If the list does contain infinite float values, the algorithm will fail. You should instead test index values in the merge loop and not rely on guard values.
list index values start at 0 in C and most programming languages, so the initial call mergesort(s, 1, size) is inconsistent unless you subtract 1 from all index values in subscripting expressions.

Algorithms are better formalized with 0 based loops with an excluded upper bound. The pseudo-code is confusing and the book is not practical for programmers. You should consider books that analyzes algorithms with a practical approach in the language of your choice.

Here is a modified version:

Source https://stackoverflow.com/questions/71311126

QUESTION

Merge Sort using sentinels in C# produces weird outputs

Asked 2022-Jan-10 at 14:14

I am trying to implement the merge sort algorithm using sentinels in C#.

The array I am trying to sort:

...

ANSWER

Answered 2022-Jan-10 at 11:01

You have at least next several errors in the left/right array initialization:

for left you should start from lowerIndex:

Source https://stackoverflow.com/questions/70640711

QUESTION

ItemTouchHelper - Can't scroll RecyclerView, Swipe doesn't work

Asked 2021-Dec-25 at 15:17

Well, at the beginning of the Implementation of ItemTouchHelper, I chose to use only the Swipe function from it. Everything worked - with the help of Swipe I could delete items in RecyclerView etc. But then I thought I'd add up-down movement so that the user could change the order in which the item appears in the list. Then the problems began - the user can change the order in which items are displayed, but can no longer:

Scroll RecyclerView (even if changing item up-down position is disabled)
Swipe functions have stopped working - onSwiped does not return the side (ItemTouchHelper.LEFT, ItemTouchHelper.RIGHT) in which the item was swiped

I changed the View on which is trigger OnStartDragListener from _view to just ImageView and I can scroll now but there are now other problems:

Swipe works on that ImageView too - I want to be able to swipe item whereever user click on item (_view)
Swipe functions still doesn't work - onSwiped does not return the side (ItemTouchHelper.LEFT, ItemTouchHelper.RIGHT) in which the item was swiped

Video how the problem looks

FIXED

I Changed

...

ANSWER

Answered 2021-Dec-25 at 15:17

FIXED

I Changed

Source https://stackoverflow.com/questions/70480389

QUESTION

How do I write this pseudocode in C++? Function returns two arrays to two initialized arrays

Asked 2021-Nov-12 at 20:27

I am trying to implement a bottom up approach function to the rod cutting problem and I need to use this particular pseudo-code from the CLRS textbook. In it there two functions and one calls the other in this fashion

(r,s) = EXTENDED-BOTTOM-UP-CUT-ROD(p,n)

Where r and s are two different arrays. The function also returns two arrays. I am currently using C++ and I've tried things such as

...

ANSWER

Answered 2021-Nov-12 at 20:27

You can use tuples and "structured binding" in C++17 to return multiple values efficiently as below:

Source https://stackoverflow.com/questions/69948501

QUESTION

How to make X axis wider in foresplot

Asked 2021-Oct-10 at 19:02

I'm having trouble widening the x axis of the forestplot. i.e. area inside the red box. I want to increase/zoom-in the plotted area(area inside the red box) without skipping any numbers. I want it to be wide enough for improved visibility. Any tips on how to expand the mean (95% CI) number lines would be greatly appreciated.

Can anyone help me?

Here are the r codes that I have used to create the above forestplot:

...

ANSWER

Answered 2021-Oct-10 at 19:01

Here is a potential solution to your problem. You can create the range of your x-axis by doing this Tthis is just an example. I am not sure what values you want to use).

Source https://stackoverflow.com/questions/69517715

QUESTION

I am trying to make a color game in react but always end up with diffrent colors

Asked 2021-Sep-17 at 14:25

MY REACT GAME

This is my jsx code I am trying to create a color game but my main_color starts from undefined and then lags behind the main color array which I created and imported from another function . I need help fixing my code . Can anyone help me with it

...

ANSWER

Answered 2021-Sep-17 at 14:25

Ok so if I understand what you want to do, this is your problem:

Source https://stackoverflow.com/questions/69224825

QUESTION

The interpretation of expected time bound for searches in a hash table

Asked 2021-Sep-14 at 08:47

As CLRS book,page 260 stated,

I wouldn't have any problem if the author says the bound is eventually
or even

What kind of theories shall we apply to simplify the original result, i.e, cancelling the factor 1/n of a. Since n is one of inputs of the function, is it necessary to cancel it by treating it as a constant? What i've missed? is anyone got the same confusion T_T?

...

ANSWER

Answered 2021-Sep-14 at 08:47

alpha/n is asimptotically smaller (has lower order) being compared with alpha, so it might be ignored. When n (hashtable size, AFAIU) becomes larger, 1/n value tends to zero.
Note - wiki table does not contain 1/n function because it is evaluated as having zero impact

Alike situation - if time is Theta(n^2 + 100*n + 10000), dominating summand is quadratic, and

Source https://stackoverflow.com/questions/69172343

QUESTION

How can a never-ending recursive function have a time complexity?

Asked 2021-Aug-19 at 13:47

In the book "Introduction to Algorithms" by CLRS we are asked to find the time complexity of a recursive function:

4.4-8
Use a recursion tree to give an asymptotically tight solution to the recurrence T(n) = T(n - a) + T(a) + cn where a ≥ 1 and c > 0 are constants.

However, when T(a) is called, T(a) will be called again, which will call T(a) again, and so on. There will never be a base case for this branch. The function will therefore never end! How can this function then have a time complexity of O(n^2) when it actually will result in O(∞)?

...

ANSWER

Answered 2021-Aug-19 at 13:47

When recurrence relations are given for the purpose of determining complexity, the base case(s) are often just left out.

Assuming that the program terminates, then if x is any constant, T(x) is also a constant. You can just replace it with a constant like "d", or remember that you don't have to expand it.

Since it doesn't matter what the constant is, it will often be written as O(1), even though that is formally incorrect, because O(1) is a set. It's also not appropriate for you, since you are looking for a tight bound.

Source https://stackoverflow.com/questions/68848877

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You can download it from GitHub.

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