Find all permutations of a string

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Find all permutations of a string

Given a string, write a Python program to find out all possible permutations of a string. 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. Python code to demonstrate. Output: Initial string abc Resultant List ['abc', 'acb', 'bac', 'bca', 'cab', 'cba']. Recommended Posts: Find length of a string in python 4 ways Python Ways to find nth occurrence of substring in a string Python Ways to split a string in different ways Python Permutation of a given string using inbuilt function Reverse string in Python 5 different ways Python Ways to concatenate boolean to string Python Ways to check if given string contains only letter Ways to remove i'th character from string in Python Python Ways to check string contain all same characters Python Ways to remove numeric digits from given string Python Ways to sort letters of string alphabetically Python Ways to count number of substring in string Python Ways to convert list of ASCII value to string Python Ways to convert string to json object Python Ways to remove n characters from start of given string.

Check out this Author's contributed articles. Load Comments.In this Java tutorial, we will learn how to find all permutations of a string in Java.

Permutations of a String

We will solve the problem using recursion. Recursion is a process where a function calls itself repeatedly. Given a string, we have to find all the permutations of that string. A permutation is a reordered arrangement of elements or characters of a string. A Lexicographical order means the order in which words or strings are arranged in a dictionary. We pass the inputted string to the recursive allPermutations function.

We store the first character of the string in variable ch. And, the string rest contains the rest of the string which is passed to the recursive function. When the length of the string becomes 0, we create an empty ArrayList of string.

This string returns to the recResult.

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Then, we iteratively obtain each string in recResult. Then, we place character ch at all positions in the string. We create an ArrayList myResult and add the resulting string to it. We return this myResult list each time. Finally, we get all the permutations of the string.

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We sort the final answer ArrayList using Collections. At last, we print the answer. Your email address will not be published. Please enable JavaScript to submit this form. Leave a Reply Cancel reply Your email address will not be published. This site uses cookies: Find out more.

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Okay, thanks.A string of length n has n! Source: Mathword. Below are the permutations of string ABC. Refer this for a sample program.

If current string is lexicographically largest, i. We first sort the string, so that it is converted to lexicographically smallest permutation. Note that the second method always prints permutations in lexicographically sorted order irrespective of input string. This article is contributed by Aditya Goel. If you like GeeksforGeeks and would like to contribute, you can also write an article and mail your article to contribute geeksforgeeks.

See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Writing code in comment? Please use ide. Minimum number of palindromic subsequences to be removed to empty a binary string Permutations of a given string using STL Find a pair n,r in an integer array such that value of nCr is maximum Number of words that can be made using exactly P consonants and Q vowels from the given string Number of K length subsequences with minimum sum Forming triangles using points on a square.

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find all permutations of a string

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Find location of all permutations of a in b. I am trying to find an effective algorithm for this.

find all permutations of a string

So would this be a correct algorithm? How efficient would this be? I would use a comparison method that is location agnostic since any permutation is valid - assign each letter a prime number, and each string will be the multiplication of its letter values.

You also need to convince yourself that this indeed matches uniquely for each string and covers all permutations - this comes from the uniqueness of prime decomposition. Also note that on larger strings the numbers get big so you may need some library for large numbers.

There is no need to hash, you can just count frequencies on your sliding window, and check if it matches. Write a function strcount to count the number of occurrences of character ch in a string or sub-sring str.

Below is my solution. The original problem statement was something like 'find all permutations of s in b'.

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Learn more. Algorithm - find all permutations of string a in string b Ask Question. Asked 3 years, 3 months ago. Active 8 months ago. Viewed 2k times. Bao Thai. Bao Thai Bao Thai 2 2 silver badges 14 14 bronze badges.

My apologies, I corrected it. I think.

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I am not well at Big O notations. Active Oldest Votes. Leeor Leeor Hmm, that is a very interesting approach.

Considering it would be O 1 to assign a prime number to the letters assume we know up to 26 prime numbersand we divide by what the product of a is, dividing each letter in b window? Wouldn't it just be O busing the sliding window approach? Whenever you shift your window to the right, divide by the char you remove and multiply by the char you add. What is this notation?

Then just pass through the search string. Sign up or log in Sign up using Google.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.

Here are a set of generic functions require. Regarding Pengyang answer: Here is my generic function which can return all the combinations from a list of T:.

find all permutations of a string

This should not happen with combinations otherwise it should specify it is with repetition. Maybe kwcombinatorics can provide some assistance see example on home page :. The KwCombinatorics library are 3 classes that provide 3 different ways of generating ordered ranked lists of combinations of numbers.

These combinatorics are useful for software testing, allowing the generation of various types of possible combinations of input. Other uses include solving mathematical problems and games of chance. Volume 4A, Enumeration and Backtracking, chapter 7. Generating all possibilities. This actually worked as it should for combinations.

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But is does not allow to chose combinations of n in k I created a method to get the unique combination of all the integer elements in an array as shown below. I've used Tuple to represent a pair or combination of numbers:. Learn more. What is the best way to find all combinations of items in an array? Ask Question.

Asked 10 years, 3 months ago.Find all possible permutations of a String is one of the most common question that is asked if you are appearing for any good company. In a set of n elements, maximum possible number of permutations are n!. There are many possible ways to find out the permutations of a String and I am gonna discuss few programs to do the same thing.

All the solutions are almost similar except in one case i. Then I will discuss a method to improve the performance in case if character repeats. So lets start with the very basic one.

In this we print all the permutations either even if it is repeating as we are not using any check for that. In the above example you can see that results are repeating. Now lets see how to remove these repeated inputs. We achieve this by introducing java.

Set as it ensures that no element in a set could be duplicate. So even if we try to add a duplicate element in this Set it will simply discard it and in the end we will be left with only different String permutations. In the above example we can see that how by introducing sets we are able to remove duplicate Strings.

Okk it is a Solution, But is this an optimal solution? No, because although we are avoiding duplicate entries but still we are iterating over every character and we are still finding n! So lets see next example on how to improve the performance. In this program we will treat only different characters i. So lets see the program. Although the output of both the last program is same but the performance of last program is far far better than the second example.

Click here to see the chart that shows the difference between the two. Thanks for reading this post. If you feel it to be worthy and helpful then don't hesitate in sharing this knowledge with the world. Don't you think it is a great idea to connect with us so that we can keep you updated. Now Trending: How to convert Byte arra What are the new FeatureThanks for the wonderful program.

Also I have seen program which asks to print only the forward direction permutation. How do you calculate time complexity of this solution? Since program is using both looping and recursion, its difficult to calculate time complexity.

Thanks for the wonderful code. This would work for repetition. How can I count number of possible outcomes and display it in this existing code? Some bad html markup inserted into your code, specifically for the "less than" character in the for loop. Hello Ankit, how different is your problem from the one in this article, to me it looks similar.

Write a program to print all permutations of a given string

Added code to avoid duplicate entries. Ankit can u solve your problem? Can anyone please do this program iteration once i'm not getting after first first iteration "abc". Post a Comment. How to find all permutation of a String using recursion is one of the tricky coding questions from Programming job interviews.

It does not only serve as a good question to check whether the candidate understands recursion but also its one of the better Java programming exercise for beginners.

Typically, you will be asked to write a method, which accepts a String and print all permutations or may return all permutations in a List for a junior developer position.

Depending upon the company you are going for an interview, they may ask you to code on IDE like Eclipse or NetBeans, or simply write code in plain paper, so be prepared for both. There are two main ways to solve this problem, using loops or by using recursion, the second one is what interviewer expect.

Since recursion is a tricky programming concept to master, it's not easy for every programmer to solve this problem on the fly, especially if you are not coding on a daily basis or don't have that highly sought after code sense. Like everything else, practice is your friend, doing this kind of coding exercises on a daily basis, solving programming puzzles and doing more complex programs available on internet sites like project Euler, TopCoder will help you to build confidence in your coding and problem-solving skill.

You can also take help of some classic books like Programming Interviews Exposed and Cracking the Coding Interview books to do well on coding interviews. Share to Twitter Share to Facebook. Labels: Coding Interview Question.


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