# Minimum swaps to make two arrays equal

Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. The input is two arrays, each one up to length 6 and each element in the array can be some number from [1, 2, 3, 4, 5, 6]. Return minimum number to change the arrays to make the sum of two arrays equal.

Then the brute force way is compute required changes of making the sum equal to 2, 3, 4, Although in the given example, the minimum sum of A is 6, the max sum value of B is 6, so we know they will overlap at 6 so we can cut other branches.

You do not have to re-sort the arrays or recalculate the sums since you know which elements you changed by how much and you do not have to look at those again. As you mentioned yourself with a tag, a simple solution is obtained by a greedy algorithm. Let us assume the sum of A is greater than the sum of B. Then we have in priority to consider the modifications of the largest elements of A, and of the minimum elements of B. This can be performed by first sorting these two arrays a max-heap and a min-heap could also be used.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 1 year, 2 months ago. Active 8 months ago. Viewed 4k times. But I think the time complexity is too high. The hard part of this problem is we do not know what the target sum we try to merge is. Welcome to SO! Is it possible to share your attempt to solve so you can get quicker answers here from the community?

A greedy algorithm should work well here. Hi, after you change the one that has more "potential", we invalidate the sorting, and we adjust the modified element to a proper position and repeatedly — xiaokang lin. Well, yes, you invalidate the sorting, but you also know which elements you have already looked at, so you can just iterate the elements in sorted order and don't care about the once you've changed. Add a comment.

Active Oldest Votes. A greedy algorithm should work well for this: determine which of the arrays has the larger sum and which the smaller optional: sort the arrays to make the following steps faster while the sum is not the same: get the maximum element from the larger, and the minimum element from the smaller array determine which has more "potential" to equalize the sum, e.

One can easily sort in O n when there's a fixed set of possible values, like when the range is between 1 and 6 as is the case here. Sorting wouldn't even strictly be necessary: just count the values of each type which is counting sort without the actual sorting step. Matte vs pearl shutterfly complexity is largely meaningless if the input size is fixed and small which also seems to be the case here. Matt Matt 31 1 1 bronze badge.Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.

Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. An array is a sequence of objects of the same type that occupy a contiguous area of memory. Traditional C-style arrays are the source of many bugs, but are still common, especially in older code bases. Both of these standard library types store their elements as a contiguous block of memory.

However, they provide much greater type safety, and support iterators that are guaranteed to point to a valid location within the sequence. For more information, see Containers.

The following example declares an array of doubles to be allocated on the stack. The number of elements must be supplied as an integer literal or else as a constant expression. That's because the compiler has to know how much stack space to allocate; it can't use a value computed at run-time. Each element in ramtin khatami array is assigned a default value of 0. If you don't assign a default value, each element initially contains whatever random values happen to be at that memory location.

The first element in the array is the zeroth element. The last element is the n -1 element, where n is the number of elements the array can contain. The number of elements in the declaration must be of an integral type and must be greater than 0. It is your responsibility to ensure that your program never passes a value to the subscript operator that is greater than size - 1.

Stack-based arrays are faster to allocate and access than heap-based arrays. However, stack space is limited.

## Creating and Filling an Array

The number of array elements can't be so large that it uses up too much stack memory. How much is too much depends on your program. You can use profiling tools to determine whether an array is too large. You may require an array that's too large to allocate on the stack, or whose size isn't known at compile time. It's possible to allocate this array on the heap by using a new[] expression. The operator returns a pointer to the first element. The subscript operator works on the pointer variable the same way it does on a stack-based array.

You can also use pointer arithmetic to move the pointer to any arbitrary elements in the array.You are given an unordered array consisting of consecutive integers [1, 2, 3, You are allowed to swap any two elements. Find the minimum number of swaps required to sort the array in ascending order. It took swaps to sort the array. The first line contains an integer,the size of. The 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.

Prepare NEW. Example 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. Sample Input 0. Sample Output 0. Explanation 0. Sample Input 1. Sample Output 1. Explanation 1. Sample Input 2. Sample Output 2. Explanation 2.Get FREE domain for 1st year and build your brand new site. You are given an array of n non-negative integers. Your task is to find the minimum number of operations to make XOR of array equal to zero by performing the operations which are defined as follows:.

Your task is to find the minimum number of operations to make XOR of array equal to zero by performing the operations which are defined as follows: Select the element on which you will perform the operations. Note that all the operations must be performed only on the selected element.

The operation that can be performed are increment and decrement by one. Examples Input: No. Input: No. Explanation of solution Before discussing the various approaches to the problem let us briefly review XOR. Example: The XOR of 5 in binary and 6 mami ki behen chudai kiya binary will be in binary or 3 in decimal. We can solve this problem by two approaches: Brute force approach: Let the selected element be the i th element.

Now let us find the XOR of the all the elements excluding the ith element n operations. Now, if the obtained XOR is equal to the i th element, then we don't need to perform any operation as XOR of whole array is already zero; otherwise the no.

Also, we need to calculate the calculate the cost for each element and the minimum of these will be the answer. Now we need to find the minimum number of changes to one element so that XOR of the array is zero. Let us assume that selected number is 2. Operations for 2 are equal to 9. Similarly, operations for 4, 7 and 8 are equal to 9, 7 and 7 respectively. Answer is equal to minimum 9,9,7,7 i. In this solution we will utilise three important facts about XOR: It is associative.

XOR of an element with itself is zero. XOR of a number with zero is the number itself. Now with this property in hand, we will make the process of finding the XOR of all elements excluding the i th element O 1. First, we will find XOR of all the elements of the array and store it in a variable lets say A. Thus the cost for the i th element will be absolute array[i]-XOR A, array[i]. We will calculate the cost for each element of the array and the minimum of these costs will be the answer.

Let us find the XOR of the whole array and store it in a variable M. So operations for 2 are equal to 9. Similarly, operations for 4, 7 and 8 are equal to 9, 7 and 7 respectively We will run a loop over the array for this. In this way we have reduced the complexity from n 2 to n where n is the number of elements in the array. Share this.Computer Science Stack Exchange is a question and answer site for students, researchers and practitioners of computer science.

It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Given an array of size n, find minimum number of swaps required, so that no two adjacent elements are equal. For ex. Is there any way to do it in polynomial time complexity? Update: I found this question on the discussion forum of codeforces link and similar question using strings on leetcode link as well.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. How often do people actually copy and paste from Stack Overflow?Minimum swaps to make two arrays identical - GeeksforGeeks.

Minimum swaps to make two arrays identical - GeeksforGeeks Given two arrays which have same values but in different order, we need to make second array same as first array using minimum number of swaps. This problem can be solved by modifying the array B. We save the index of array A elements in array B i. This modified array represents distribution of array A element in array B and our goal is to sort this modified array in minimum number of swaps because after sorting only array B element will be aligned with array A elements.

Now count of minimum swaps for sorting an array can be found by visualizing the problem as a graphthis problem is already explained in previous article. So we count these swaps in modified array and that will be our final answer. Popular Posts Archives. LeetCode - Largest Plus Sign. Tree S Expression. DropBox Interview Misc. Leetcode - Rotate an array right by k element. Smallest number by rearranging digits of a given number - GeeksforGeeks.

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Problem solving with programming: Minimum area of a square enclosing given set of points Given a set of coordinates in a two dimensional Dynamic Programming Set 27 Maximum sum rectangle in a 2D matrix.The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project.

## Minimum number of operations to make XOR of array equal to zero

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Get access to thousands of hours of content and a supportive community. Start your free trial today. Below is my implementation in python. It seems to be working well except the line that calculates swaps needed in lst3. I tried the below approach and it works. Why is this happening if I'm only plugging in the value of a variable instead of the variable itself? In your example as well as the example in the problem statement, no number needs to be swapped more than once. You could try this.

I don't actually have Python on the machine that I on right now, so I couldn't test it. But it's a different angle than what you are taking and it's a bit shorter. Have fun! You're writing some complicated code. I think your code is going to say that 4 numbers are wrong and it would take 2 swaps to fix.

But 3 swaps are needed as far as I can tell. Every swap doesn't necessarily correct 2 items. Also, if you needed to count how many are wrong it would be more efficient to compare corresponding values from both lists and increment whenever the values don't match.

## Explanation of solution

The reason that your original swap and your commented swap in your update aren't working is because the list gets modified during the assignments. After the right side of the assignment is evaluated you can think of the code like this: using the current value for k.

After the first assignment the list has been modified and now looks like this [0, 1, 2, 2]. The 2nd assignment is supposed to assign the 3 to index 3 but it ends up going into index 2 making it look like nothing happened. In your original code you used is not which is comparing identities not values. Consider the list [5, 4, 3, 2, 0, 1].

It takes 4 swaps as far as I can tell. Try this out on your working code. I think it's going to report 3 swaps with a final not fully sorted list of [1, 0, 2, 3, 4, 5]Mp3juice cc download free 1 more swap was needed.

I would look into implementing an already proven sorting algorithm. You've reframed the problem as sorting lst3 with a minimum number of swaps. I think a possible problem you're going to run into is whether or not any of the sorting algorithms guarantee a minimum number of swaps for any possible list. Selection sort is inefficient for large lists but it does seem to try to minimize the number of swaps taking place. There's an implementation of it on that page which I think is in C code but you can convert it to python code and wrap it into a function.

Add a counter to it and increment it whenever a swap takes place. I worked out selection sort for a few examples with pencil and paper and it does seem to produce the minimum number of swaps but I don't know if it always will.

Given two arrays that have the same values but in a different order, we need to make a second array the same as a first array using the minimum. Minimum swaps of same-indexed elements required to make sum of two given arrays even · Input: arr1[] = {11, 14, 20, 2}, arr2[] = {5, 9, 6, 3}.

Given two arrays which have same values but in different order, we need to make second array same as first array using minimum number of swaps. A greedy algorithm should work well for this: determine which of the arrays has the larger sum and which the smaller; optional: sort the.

tdceurope.eu › blog › entry. Recently, I was thinking about a one problem and now I want to share it with you: You have two arrays of the same length n, and you have to calculate minimum. · Method to return the minimum number · of swap required to make both the arrays identical. · · array 1

In one move, you can increment or. You can swap any two characters that belong to different strings, which means: swap s1[i] and s2[j]. Return the minimum number of swaps required to make s1 and. Minimum Swaps Required to Sort an Array, You are allowed to swap any two Minimum swaps to make two arrays identical, Given two arrays that have the same. Let the largest number be denoted Hacking fb account case. Assume we don't swap with K, and consider if we split the array at K to get two arrays, A and B.

Example. You are given two arrays 'NUMS1' and 'NUMS2' of size 'N' and 'M', respectively. to make the sum of the elements of both the arrays equal after swapping. You are allowed to swap any two elements. Find the minimum number of swaps required to sort the array in ascending order. Example. “Minimum swaps to make sequences increasing” states that you are given two arrays a[ ] and b[ ] of the same size n. Swap the elements of the array a with. You are given two arrays A and B of length N.

You can apply swap find the minimum cost to make the two arrays identical where two arrays. Prepare for your technical interviews by solving questions that are asked in interviews of various companies. HackerEarth is a global hub of 5M+ developers. arrays backtracking c++. Given an array of size n, find minimum number of swaps required, so that no two adjacent elements are equal.

Your task is to make these two strings equal to each other. want to find the minimum swaps so we only consider the different part between the 2 arrays. public class Swap { static int minimumSwaps(int[] arr) { int swap=0; boolean visited[]=new minimum number of swaps to sort an array javascript. The order of the elements are important — two arrays are only equal if they The Swap and SwapMemory functions both take two indices and will swap the.