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1. www.geeksforgeeks.org › most-efficient-way-to-findMost Efficient Way to Find a Missing Number in an array

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   May 24, 2024 · Given an array of numbers from 1 to N (both inclusive). The size of the array is N-1. The numbers are randomly added to the array, there is one missing number in the array from 1 to N. What is the quickest way to find that missing number? An approach using the XOR operator:

2. www.onlinetutorialspoint.com › java › how-to-find-aHow to find a missing number in an array ? | unsorted Array ...

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   Feb 29, 2020 · Missing Number is:5 Find a missing number in an array (Un-Sorted): We can even find a missing number in an unsorted array in a simple approach using the formula n*(n+1)/2. Approach: Calculate the sum of number using (n+1) * (n+2)/2; Loop through all the elements from the array and subtract all the numbers form the sum. Then you will get the ...

3. www.geeksforgeeks.org › find-the-only-missingFind the only missing number in a sorted array - GeeksforGeeks

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   May 12, 2024 · Given a sorted array arr[], the task is to calculate the number of missing numbers between the first and last element of the sorted array. Examples: Input: arr[] = { 1, 4, 5, 8 } Output: 4 Explanation: The missing integers in the array are {2, 3, 6, 7}.

4. www.geeksforgeeks.org › find-all-missing-numbersFind all missing numbers from a given sorted array ...

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   Feb 8, 2022 · Given a sorted array arr[], the task is to calculate the number of missing numbers between the first and last element of the sorted array. Examples: Input: arr[] = { 1, 4, 5, 8 } Output: 4 Explanation: The missing integers in the array are {2, 3, 6, 7}.

5. www.baeldung.com › java-array-find-missing-numberFind Missing Number From a Given Array in Java | Baeldung

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   Jun 22, 2024 · xorValue = Arrays.stream(numbers).reduce(xorValue, (x, y) -> x ^ y); Since every number except the missing number comes twice, the xorValue will only contain the missing number in the numbers array from the range [1-9]. Lastly, we should verify that our approach gives the correct results: assertEquals(3, xorValue); Great! We got this one right. 5.

6. www.interviewbit.com › blog › find-the-missing-numberFind The Missing Number - InterviewBit

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   Oct 8, 2021 · The size of the array is N – 1. So the sum of n elements, that is the sum of numbers from 1 to N can be calculated by using the formula N * (N + 1) / 2. Now find the summation of all elements in the array and subtract it from the summation of first N natural numbers, the value obtained will be the value of the missing element. Algorithm:

7. www.geeksforgeeks.org › javascript-program-to-findJavaScript Program to Find the Missing Number - GeeksforGeeks

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   Jun 14, 2024 · To find the missing number, first find the sum of the first N natural number using the formula. And then use array traversal using a loop (for / while, …) and find the sum of array elements. At last, subtract the sum of array elements from the sum of natural numbers to find the missing element of an array.