• This problem is an extension of check if there is a subset with given sum. We recursively generate all subsets. We keep track of elements of current subset.

## Python – Calculate magic square with python

If sum of elements in current subset becomes equal to given sum, we print the subset. Please refer below post for an optimized solution based on Dynamic Programming. Print all subsets with given sum using Dynamic Programming. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Writing code in comment?

Please use ide. Minimum number of substrings the given string can be splitted into that satisfy the given conditions Count number of ways to arrange first N numbers. Given an array and a number, print all subsets with sum equal to given the sum.

Python program to print all subsets with given sum. The vector v stores current subset. If remaining sum is 0, then print all.

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If no remaining elements. We consider two cases for every element.

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Wrapper over printAllSubsetsRec. This code is contributed by ihritik. WriteLine.

Add arr[n - 1]. Recommended Posts: Recursive program to print formula for GCD of n integers Recursive program to print all numbers less than N which consist of digits 1 or 3 only Recursive Program to print multiplication table of a number Print sums of all subsets of a given set Perfect Sum Problem Print all subsets with given sum Print the last k nodes of the linked list in reverse order Recursive approach Recursive Program for Binary to Decimal Recursive program for prime number Recursive program to generate power set Recursive program to replace all occurrences of pi with 3.

You have one method and you don't even reference self. In theory you could remove self and mark it a staticmethodbut really it should just be a function without a class. So can't you just write for coin in coins without an interior termination condition? It would be more clear to use n directly instead:.

### Sum and Product Puzzle

Actually every positive integer can be written as the sum of at most four squares according to Lagrange's four-square theorem. You can remove the coins variable altogether and replace it with a generator of squares:.

You don't necessarily need a defaultdict with a lambda, since you are going to create the all the values in the dict anyway defaultdict is more appropriate if you don't know in advance what keys you'll need :.

I don't see a better option right now. I don't know exactly how you'd go about this approach, though. Thanks to Lagrange's four-square theoremyou know you will need at most four squares of positive integers.

Every selection will be similar, though under potentially more severe constraints, so use recursion:. As others already said, wrapping a pure function in a class without any good reason makes no sense. The theorem allows the squares to be zero, so in context of our problem we will say that every natural number can be represented as the sum of four or less integer squares. The code runs in ms and I believe it can be better improved and explained but the theorem is the main idea. Sign up to join this community.

The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Minimum perfect squares needed to sum up to a target Ask Question.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Skip to content. Permalink Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Sign up. Branch: master. Find file Copy path. Raw Blame History. Level description Level Description Level 1 Beginner means someone who has just gone through an introductory Python course.

He can solve some problems with 1 or 2 Python classes or functions. Normally, the answers could directly be found in the textbooks. Level 2 Intermediate means someone who has just learned Python, but already has a relatively strong programming background from before. He should be able to solve problems which may involve 3 or 3 Python classes or functions.

The answers cannot be directly be found in the textbooks. Level 3 Advanced. He should use Python to solve more complex problem using more rich libraries functions and data structures and algorithms.

He is supposed to solve the problem using several Python standard packages and advanced techniques. Problem template Question Hints Solution 3. Questions Question 1 Level 1 Question: Write a program which will find all such numbers which are divisible by 7 but are not a multiple of 5, between and both included.

The numbers obtained should be printed in a comma-separated sequence on a single line. The results should be printed in a comma-separated sequence on a single line. Suppose the following input is supplied to the program: 8 Then, the output should be: Hints: In case of input data being supplied to the question, it should be assumed to be a console input. Suppose the following input is supplied to the program: 34,67,55,33,12,98 Then, the output should be: ['34', '67', '55', '33', '12', '98'] '34', '67', '55', '33', '12', '98' Hints: In case of input data being supplied to the question, it should be assumed to be a console input.

Also please include simple test function to test the class methods. H is D is the variable whose values should be input to your program in a comma-separated sequence. Example Let us assume the following comma separated input sequence is given to the program:The output of the program should be: 18,22,24 Hints: If the output received is in decimal form, it should be rounded off to its nearest value for example, if the output received is Example Suppose the following inputs are given to the program: 3,5 Then, the output of the program should be: [[0, 0, 0, 0, 0], [0, 1, 2, 3, 4], [0, 2, 4, 6, 8]] Hints: Note: In case of input data being supplied to the question, it should be assumed to be a console input in a comma-separated form.

Suppose the following input is supplied to the program: without,hello,bag,world Then, the output should be: bag,hello,without,world Hints: In case of input data being supplied to the question, it should be assumed to be a console input. Suppose the following input is supplied to the program: hello world and practice makes perfect and hello world again Then, the output should be: again and hello makes perfect practice world Hints: In case of input data being supplied to the question, it should be assumed to be a console input.

We use set container to remove duplicated data automatically and then use sorted to sort the data. The numbers that are divisible by 5 are to be printed in a comma separated sequence. Example: , Then the output should be: Notes: Assume the data is input by console. Hints: In case of input data being supplied to the question, it should be assumed to be a console input.

Suppose the following input is supplied to the program: hello world! Suppose the following input is supplied to the program: Hello world!By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to write a function that will not only determine whether the sum of a subset of a set adds to a desired target number, but also to print the subset that is the solution. We can map each selection of a subset of the list to a 0-padded binary number, where a 0 means not taking the member in the corresponsing position in the list, and 1 means taking it.

So masking [1, 2, 3, 4] with creates the sub-list [2, 4]. If we use these sub-list selections as masks and sum the selection - we can know the answer. Note: While not padding the mask with zeros may work as well, as it will simply select members of the original list in a reverse order - I haven't checked it and didn't use it. I didn't use it since it's less obvious to me what's going on with such trenary-like mask 1, 0 or nothing and I rather have everything well defined.

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Active 4 years, 9 months ago. Viewed 20k times. Thanks in advance! Return a tuple of the subset and whether or not the sum adds to your desired target number. Like return subset, True.

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Not sure how to do that. How do I get the tuple?

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Did you try to search the web for how to do that? Here's one of the top results on google. Sorry, I do know how to return multiple values. That is not the problem.

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My code worked, but it exceeded the time limit for 2 of the cases. Find all unique triplets in the array which gives the sum of zero. The algorithm basically iteratively takes one number out of the list of numbers provided and sees whether there are two numbers in the remaining list that sum to the negative of the removed number so that all three numbers sum to 0.

This is done using a dictionary. Then, to avoid repetition, I sort the solutions and store them in a dictionary and return the list of values in the dictionary.

### Recursive program to print all subsets with given sum

I just want to know if there is any way to make my code faster either by eliminating the need to sort each triplet or otherwise? The D variable here is a dictionary.

But you are looping over n items, performing a test complement in D. I suspect you can get a lot of performance back if you figure out how to not do that: it looks like you are treating D as a list, since you are using x as the key and nums[x] as the value. I'll point out to you that unlike lists, tuples are immutable and therefore can be hashed, which makes them valid as dict keys. So you can use a dict of tuples. Or a set of tuples. Sign up to join this community. The best answers are voted up and rise to the top.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. The Overflow How many jobs can be done at home? Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap.

Related 4. Hot Network Questions. Question feed.Please read the Help Documents before posting. Hello There, Guest! Login Register. Login Username: Password: Lost Password? Remember me. Thread Rating: 0 Vote s - 0 Average 1 2 3 4 5. Thread Modes. Hi, all! I'm new to the forums, and have a small problem on this short program homework assignment. Hopefully somebody can help me out. I'm working on a program to have the user enter a number to see if it's a perfect square.

Good job! That being said, my teacher wants me to write this program without using a function, and I'm a little confused on how to do that Any tips would be great. I know it's super easy, I just can't come up with the solution for some reason. Sep, AM forumer Wrote: Hi, all! Thank you, I appreciate the help, but it's still not running properly. There's still a logic error. View a Printable Version Subscribe to this thread.

Default Dark Midnight. Linear Mode. Threaded Mode. Lost Password? Find Quote metulburr The Castle of aaarrrrggh Posts: 4, Threads: Joined: Sep Reputation: Likes received: 2 Sep, AM 1 move the code in the function to the first part of the while loop. Edited 1 time in total. Find Quote. Dec, PM Last Post : micseydel. Aug, AM Last Post : micseydel.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Skip to content. Permalink Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Sign up. Branch: master. Find file Copy path. Raw Blame History. Let isSubSetSum int set[], int n, int sum be the function to find whether there is a subset of set[] with sum equal to sum. If any of the above the above subproblems return true, then return true. Following is the recursive formula for isSubsetSum problem.

Therefore time complexity of the above solution is exponential. The problem is in-fact NP-Complete There is no known polynomial time solution for this problem. We can solve the problem in Pseudo-polynomial time using Dynamic programming.

We create a boolean 2D table subset[][] and fill it in bottom up manner. The value of subset[i][j] will be true if there is a subset of set[ You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. ROWS : array. COL : range sum. Row 0. Find out which Numbers should be in the subset.

First Row. Bottom-Right most ele.