Find duplicate elements in array in c

apologise, but, opinion, there other way the..

Find duplicate elements in array in c

The solution should either return the index of first occurrence of the required element, or -1 if the element is not present in the array. The algorithm to find maximum is: we assume that it's present at the beginning of the array and stores that value in a variable.

For example, if A is a matrix, then max A,[],[1 2] computes the maximum over all elements in A, since every element of a matrix is contained in the array slice defined by dimensions 1 and 2. Using of simple if else condition and loop to find the numbers. This is very simple. Print the max after finding it. Finally we use another version of Max that receives a lambda expression.

Create a program that will return the maximum and minimum numbers in the elements of ONE-dimensional integer array. Find a duplicate. Each value is called an element of the array.

Figure shows another way of thinking of the numbers array as an array of arrays. Find the sum of the first and last element of the array 3. We can find the smallest element or number in an array in java by sorting the array and returning the 1st element. At this point, the last element in the array will be sorted. The code has been written in five different formats using standard values, taking inputs through scanner class, command line arguments, while loop and, do while loop, creating a separate class.

The program must search if the value V exists in the array and must remove the first occurrence of V, shifting each following element left and adding a zero at the end of the array. How to swap two numbers without using temporary variable? Write a program to print fibonacci series.

I want to search through an array of n numbers and find the numbers that are repeated. Write Java code for a loop that simultaneously computes both the maximum and minimum of an array. Copy On Write a reference to the array. Next: Write a program in C Sharp to separate odd and even integers in separate arrays.

Suitable examples and sample programs have also been added so that you can understand the whole thing very clearly.

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Minimum distance between two numbers in an array. C program to find the maximum or the largest element and the location index at which it's present in an array. Repeat this till the end of the array. This Java program shows how to find the largest and the smallest number from within an array. Each row of two-dimensional array has a length field that holds the number of columns. You should reference array elements by using the index in each dimension.

Just focus on the syntax of this for loop, rest of the part is very easy. I assume that you could write some simple programs. I was a bit dismayed to find out that Flash had no simple built-in way of getting the maximum value from an array.

The second element and the third element is evaluated next. For example, if A is a matrix, then min A,[],[1 2] computes the minimum over all elements in A, since every element of a matrix is contained in the array slice defined by dimensions 1 and 2.

Display the values in If the first and only parameter is an array, max returns the highest value in that array.Arrays a kind of data structure that can store a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.

Instead of declaring individual variables, such as number0, number1, …, and number99, you declare one array variable such as numbers and use numbers[0], numbers[1], and …, numbers[99] to represent individual variables.

A specific element in an array is accessed by an index. All arrays consist of contiguous memory locations. The lowest address corresponds to the first element and the highest address to the last element. The program output is also shown in below. The Output of the program is shown above.

If you found any error or any queries related to the above program or any questions or reviewsyou wanna to ask from us ,you may Contact Us through our contact Page or you can also comment below in the comment section. We will try our best to reach up to you in short interval. Thanks for reading the post….

What is an Array? Enter array size Max : 50 :: 8. Enter array elements Enter arr [ 0 ] Element :: 1. Enter arr [ 1 ] Element :: 2. Enter arr [ 2 ] Element :: 3. Enter arr [ 3 ] Element :: 4. Enter arr [ 4 ] Element :: 5. Enter arr [ 5 ] Element :: 2.

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Enter arr [ 6 ] Element :: 3.All elements of the array are in range 1 to n. And all elements occur once except two numbers which occur twice. Find the two repeating numbers. So the output should be 4 2. Method 1 Basic Use two loops. In the outer loop, pick elements one by one and count the number of occurrences of the picked element in the inner loop.

Method 2 Use Count array Traverse the array once. While traversing, keep track of count of all elements in the array using a temp array count[] of size n, when you see an element whose count is already set, print it as duplicate. Method 3 Make two equations Let the numbers which are being repeated are X and Y. We make two equations for X and Y and the simple task left is to solve the two equations. Similarly calculate product of input array, when this product is divided from n! Given sum and product of X and Y, we can find easily out X and Y.

Using above two equations, we can find out X and Y. Thanks to geek4u for suggesting this method. As pointed by Beginerthere can be addition and multiplication overflow problem with this approach.

The approach used here is similar to method 2 of this post. Let the repeating numbers be X and Y, if we xor all the elements in the array and all integers from 1 to n, then the result is X xor Y. Suppose that the kth bit of X xor Y is 1, we can xor all the elements in the array and all integers from 1 to n, whose kth bits are 1.

The result will be one of X and Y. Method 5 Use array elements as index Thanks to Manish K. Aasawat for suggesting this method. Note that this method modifies the original array and may not be a recommended method if we are not allowed to modify the array.

Find Duplicate element in an array -- 2 methods

Writing code in comment? Please use ide. Python3 program to Find the two. This code is contributed by Smitha Dinesh Semwal. Write "Repeated Elements are :". Python3 code for Find the two repeating. This code is contributed by Nikita Tiwari. Write "Repeated elements are: ". S is for sum of elements in arr[].

C program count total duplicate elements in array

P is for product of elements in arr[]. Calculate Sum and Product. Python3 code to Find the.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 have an array containing my Post objects. Every Post has an id property. Here I am assuming your Post struct or class has an id property of type String. As I mentioned in my comment to the question, you can make use of a modified Daniel Kroms solution in the thread we previously marked this post to be duplicate of. Just make your Post object hashable implicitly equatable via id property and implement a modified using Set rather than Dictionary ; the dict value in the linked method is not used anyway version of Daniel Kroms uniq function as follows:.

Alternatively to using a free function, we could implement uniq as a constrained Sequence extension:. Instead of making your Post model hashable, you could also use a wrapper class. This wrapper class would use the post objects property to calculate the hash and equality.

Now we create wrapper objects for every post with closure to determine equality and the hash. And we create the set. Instead of using a hashable object, you could just use a set. Take an attribute value that you want to remove duplicates for and use that as your test value. Swift 3. There is a good example from this post. Learn more. Remove duplicate objects in an array Ask Question. Asked 4 years, 3 months ago. Active 4 days ago. Viewed 26k times. Oscar Apeland Oscar Apeland 5, 5 5 gold badges 36 36 silver badges 77 77 bronze badges.

First result in google search for "Remove duplicate objects in an array swift" goes to dfri's link Cristik The linked reply did not answer my question, as I want to check for duplicate properties in an object, not duplicate objects. OscarApeland please then update the question, nor from the title or the contents cleary results that you need the array filtered by a property, not by the object itself.

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OscarApeland That was never my intention, my apologies if you perceived it as such. I simply marked this question in it's current form as a duplicate, mostly due to it's title. As Cristik writes, edited questions can possibly be re-opened again. Next time, possibly be more specific, e.

Finally, we're all here to learn and teach each other, never be afraid to asks questions, we also learn from how we ask, how to ask next time. Active Oldest Votes.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'm reading the contents of file into a 9 element array. I need to check if there are any duplicates in this array. I need to do this without reordering or changing the any of the contents of the array.

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You've only got 9 elements in the array, so it'll only take 36 comparisons to find any duplicates:. Learn more. How to check if an array has any duplicates? Ask Question. Asked 8 years, 5 months ago. Active 3 years, 10 months ago.

Viewed 40k times. How would I go about doing this?

find duplicate elements in array in c

Petefic Petefic 5 5 gold badges 13 13 silver badges 31 31 bronze badges. I think this stack answer has what you're looking for: stackoverflow. Note that as written your array has 8 elements, not 9. Oh yea, sorry didn't notice that :P My bad. Active Oldest Votes. Use brute force. Caleb Caleb k 17 17 gold badges silver badges bronze badges. The first and outer loop only needs to go up to count - 1because otherwise the inner loop at the last iteration is completely useless.

I will edit the answer to reflect this improvement. So simple. You should look at the same question in Java and all the inefficient answers it got. AT Say you've got 9 items in an array and want to compare each pair of items: start with the first one, and compare it to each of the other 8 items in the array.

That's 8 comparisons so far. Then move to the second one. No need to compare it to the first item, you already did that, so compare to each of the remaining 7 items. And that's just what the code above does. In fact, if you search for questions tagged with both c and duplicatesyou'll find as I'm writing this questions.

The best non-brute-force solution will depend on the question, e. If you have a specific question, ask it. The OP has indicated that array modifications should be avoided. The Q says reordering the array isn't acceptable. You could copy the array first, sort the copy, and then look for duplicates using your code above, but that wouldn't tell you which indices in the original array are the duplicates. Caleb The OP doesn't ask for the index. It actually just want to know if there's a duplicate.

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Sign up or log in Sign up using Google.Given an array of n elements which contains elements from 0 to n-1, with any of these numbers appearing any number of times. Find these repeating numbers in O n and using only constant memory space. Find the two repeating elements in a given array. Method 1 and Method 2 of the above link are not applicable as the question says O n time complexity and O 1 constant space.

Also, Method 3 and Method 4 cannot be applied here because there can be more than 2 repeating elements in this problem. Method 5 can be extended to work for this problem. Below is the solution that is similar to Method 5. There is a problem in the above approach. It prints the repeated number more than once. In below set, another approach is discussed that prints repeating elements only once.

Only two traversals are needed. So the time complexity is O n. Auxiliary Space: O 1. No extra space is needed, so the space complexity is constant.

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Duplicates in an array in O n and by using O 1 extra space Set Writing code in comment? Please use ide. Python3 code to find. Function to print duplicates. This code is contributed by Shreyanshi Arun. Abs arr[i] ].

Write Math. Python3 code to find duplicates in O n time. This code is contributed by 29AjayKumar. Load Comments.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 have an array containing my Post objects. Every Post has an id property. Here I am assuming your Post struct or class has an id property of type String. As I mentioned in my comment to the question, you can make use of a modified Daniel Kroms solution in the thread we previously marked this post to be duplicate of.

C program to delete duplicate elements from array

Just make your Post object hashable implicitly equatable via id property and implement a modified using Set rather than Dictionary ; the dict value in the linked method is not used anyway version of Daniel Kroms uniq function as follows:.

Alternatively to using a free function, we could implement uniq as a constrained Sequence extension:.

find duplicate elements in array in c

Instead of making your Post model hashable, you could also use a wrapper class. This wrapper class would use the post objects property to calculate the hash and equality.

find duplicate elements in array in c

Now we create wrapper objects for every post with closure to determine equality and the hash. And we create the set. Instead of using a hashable object, you could just use a set.

Take an attribute value that you want to remove duplicates for and use that as your test value. Swift 3. There is a good example from this post. Learn more. Remove duplicate objects in an array Ask Question. Asked 4 years, 3 months ago. Active 4 days ago. Viewed 26k times. Oscar Apeland Oscar Apeland 5, 5 5 gold badges 36 36 silver badges 77 77 bronze badges.


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