You are allowed to swap any two elements. You need to find the minimum number of swaps required to sort the array in ascending order. Complete the function minimumSwaps in the editor below.

Simonk 30a esc arduinoIt must return an integer representing the minimum number of swaps to sort the array. The first line contains an integer,the size of. Now we can use dictionary a to find the value in given index and dictionary b to find the index of a given value. Since both our index and keys starts from 1 and mismatching key value pair basically means our value is not sorted properly.

Loop through dictionary a and whenever key doesn't match value use dictionary to find the current index of correct value. Examplemeans index 2 has value 3. But it should actually hold 2 as value. So we use b[2], which gives us the current index of 2 in dictionary a. Which means 2 is currently in index 4. So we swap index 2 and index 4 in dictionary a and increase the number of swaps count.

Then we update dictionary b accordingly. That is if is swapped with in dictionary a, we will swap with Welcome back!

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Function Description Complete the function minimumSwaps in the editor below.

## Number of swaps to sort when only adjacent swapping allowed

Constraints Output Format Return the minimum number of swaps to sort the given array. Hackerrank Algorithms. You might also like. Beeze Aal Given an array arr[] of non negative integers.

We can perform a swap operation on any two adjacent elements in the array. Find the minimum number of swaps needed to sort the array in ascending order. There is an interesting solution to this problem.

It can be solved using the fact that number of swaps needed is equal to number of inversions. So we basically need to count inversions in array. The fact can be established using below observations: 1 A sorted array has no inversions. Doing x adjacent swaps can reduce x inversions in an array. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

This article is attributed to GeeksforGeeks. This function merges two sorted arrays and returns inversion count in the arrays.

Copy the remaining elements of left subarray. Copy the remaining elements of right subarray. An auxiliary recursive function that sorts the input.

Divide the array into two parts and call. Inversion count will be sum of inversions in. This function sorts the input array and returns the. This code is contributed by. Prev Next. More topics on Sorting Algorithms. Email We respect our user's data, your email will remain confidential with us. Subscribe to Our Newsletter. Sorting Algorithms Sort all even numbers in ascen Recursive Insertion Sort. Minimum swaps to make two arra C Program for Bubble Sort on L Sort a nearly sorted or K sor Chocolate Distribution ProblemBy using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I need to swap 3 and 4, and 1 and 2, so my array looks like [4, 3, 2, 1]. Now, I can just do the sort. Here I need to count how many iterations I need, to change the initial array to the final output.

Look at the example code above, it is edited now. This is most optimal code I have tried so far, also the code is accepted as optimal answer by hackerrank :.

I assume there are two reasons you're wanting to measure how many iterations a sort takes. So I will supply you with some theory if the mathematics is too dense, don't worry about itthen some practical application.

There are many sort algorithms, some of them have a predicable number of iterations based on the number of items you are sorting, some of them are luck of the draw simply based on the order of the items to be sorted and which item how you select what is called a pivot. So if optimisation is very important to you, then you'll want to select the right algorithm for the purpose of the sort algorithm.

Otherwise go for a general purpose algorithm. Here are most popular sorting algorithms for the purpose of learning, and each of them have least, worst and average running-cases.

Here is a Quicksort implementation by Charles Stover. Here is a merge sort implementation by Alex Kondov. Note that its worst and average case are the same, but its best case is the best of any algorithm.

### Minimum Swaps 2

Here is an insertion sort implementation by Kyle Jensen. Here is a selection sort algorithm written by dbdavid updated by myself for ES6.

You can quite easily add an iterator variable to any of these examples to count the number of swaps they make, and play around with them to see which algorithms work best in which circumstance.

If there's a very good chance the items will already be well sorted, insertion sort is your best choice. If you have absolutely no idea, of the four basic sorting algorithms quicksort is your best choice. The solution to this problem is not very intuitive to unless you are already somewhat familiar with computer science or real math wiz, but it all comes down to the number of inversions and the resulting cycles. If you are new to computer science I recommend the following resources to supplement this solution:.You are given an unordered array consisting of consecutive integers [1, 2, 3, You are allowed to swap any two elements.

You need to find the minimum number of swaps required to sort the array in ascending order. For example, given the array we perform the following steps:.

It took swaps to sort the array. Complete the function minimumSwaps in the editor below. It must return an integer representing the minimum number of swaps to sort the array.

The first line contains an integer,the size of.

Cpt 20552The second line contains space-separated integers. Given array After swapping we get After swapping we get After swapping we get So, we need a minimum of swaps to sort the array in ascending order.

We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies. Practice Certification NEW. Problem Submissions Leaderboard Discussions Editorial. For example, given the array we perform the following steps: i arr swap indices 0 [7, 1, 3, 2, 4, 5, 6] swap 0,3 1 [2, 1, 3, 7, 4, 5, 6] swap 0,1 2 [1, 2, 3, 7, 4, 5, 6] swap 3,4 3 [1, 2, 3, 4, 7, 5, 6] swap 4,5 4 [1, 2, 3, 4, 5, 7, 6] swap 5,6 5 [1, 2, 3, 4, 5, 6, 7] It took swaps to sort the array.

Function Description Complete the function minimumSwaps in the editor below. Input Format. Output Format. Return the minimum number of swaps to sort the given array. Sample Input 0. Sample Output 0. Explanation 0.

Nistune tb42eSample Input 1. Sample Output 1. Explanation 1. Sample Input 2. Sample Output 2. Explanation 2.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. Here is my problem statement. An excerpt:. You are allowed to swap any two elements.

You need to find the minimum number of swaps required to sort the array in ascending order. Here is one of the test cases. It is failing with a message as "Terminated due to timeout".

I used selection sort approach as selection sort makes minimum swap operation. Can I reduce it? When the time limit is exceeded, and the program appears to work correctly for non-large inputs, the typical cause of slowness is the algorithm.

It can be hard to find an efficient algorithm. To figure out the trick, look for clues. For example, look details in the question that are not used in the current algorithm.

There's nothing in your implementation that benefits from integers being consecutive, without any duplicates. That is, it's not benefitting from this constraint on the input:. And as such, maybe sorting is not needed here after all. This is still just a hint, without directly answering how to compute the minimum number of swaps. But this observation must surely be part of the implementation. I suggest to stop reading here and try to come up with an algorithm that uses the above observation and implement a passing solution.

Continue reading only if you need hints. I don't recall ever finding a bug in an online puzzle and that should always be the very last thought on your mindbut this puzzle has one.

The 8 should be replaced with 7. I worked around that by doing this when building indexes :.Given an array of n distinct elements, find the minimum number of swaps required to sort the array. This can be easily done by visualizing the problem as a graph.

Steam is laggyThe graph will now contain many non-intersecting cycles. Now a cycle with 2 nodes will only require 1 swap to reach the correct ordering, similarly a cycle with 3 nodes will only require 2 swap to do so. Below is the implementation of the idea. Related Article : Number of swaps to sort when only adjacent swapping allowed. This article is contributed by Ayush Khanduri. 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. Attention reader! Writing code in comment? Please use ide. Function returns the minimum. Create two arrays and use. Sort the array by array element. To keep track of visited elements.

Initialize all elements as not. Initialize result. Driver Code. Load Comments.

**Minimum Swaps 2 hackerrank solution // Minimum Swaps Required to Sort an Array**

We use cookies to ensure you have the best browsing experience on our website. Pair; import java.Given an array of N distinct elements, find the minimum number of swaps required to sort the array. Note : The problem is not asking to sort the array by the minimum number of swaps. The problem is to find the minimum swaps in which the array can be sorted. This problem is already discussed in the previous article using graph. In this article another approach to solve this problem is discussed which is slightly different from the cycle approach.

The next step is to sort the vector of pair according to the first element of the pair. After that traverse the vector and check if the index mapped with the value is correct or not, if not then keep swapping until the element is placed correctly and keep counting the number of swaps.

Implementation: CPP. Attention reader! 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.

### Minimum number of swaps required to sort an array | Set 2

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Writing code in comment? Please use ide. Python3 program to find the minimum number. Function to find minimum swaps to.

Declare a vector of pair. Sort the vector w. If the element is already placed. This code is contributed by mohit kumar Rohan Rajak. Check out this Author's contributed articles. Improved By : mohit kumar 29mv15andrew Load Comments. We use cookies to ensure you have the best browsing experience on our website.

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