# Find the two non-repeating elements in an array of repeating elements

Asked by SG

Given an array in which all numbers except two are repeated once. (i.e. we have 2n+2 numbers and n numbers are occurring twice and remaining two have occurred once). Find those two numbers in the most efficient way.

**Method 1(Use Sorting)**

First sort all the elements. In the sorted array, by comparing adjacent elements we can easily get the non-repeating elements. Time complexity of this method is O(nLogn)

**Method 2(Use XOR)**

Let x and y be the non-repeating elements we are looking for and arr[] be the input array. First calculate the XOR of all the array elements.

xor = arr[0]^arr[1]^arr[2].....arr[n-1]

All the bits that are set in xor will be set in one non-repeating element (x or y) and not in other. So if we take any set bit of xor and divide the elements of the array in two sets – one set of elements with same bit set and other set with same bit not set. By doing so, we will get x in one set and y in another set. Now if we do XOR of all the elements in first set, we will get first non-repeating element, and by doing same in other set we will get the second non-repeating element.

Let us see an example. arr[] = {2, 4, 7, 9, 2, 4} 1) Get the XOR of all the elements. xor = 2^4^7^9^2^4 = 14 (1110) 2) Get a number which has only one set bit of the xor. Since we can easily get the rightmost set bit, let us use it. set_bit_no = xor & ~(xor-1) = (1110) & ~(1101) = 0010 Now set_bit_no will have only set as rightmost set bit of xor. 3) Now divide the elements in two sets and do xor of elements in each set, and we get the non-repeating elements 7 and 9. Please see implementation for this step.

**Implementation:**

`#include <stdio.h> ` `#include <stdlib.h> ` ` ` `/* This finction sets the values of *x and *y to nonr-epeating ` ` ` `elements in an array arr[] of size n*/` `void` `get2NonRepeatingNos(` `int` `arr[], ` `int` `n, ` `int` `*x, ` `int` `*y) ` `{ ` ` ` `int` `xor = arr[0]; ` `/* Will hold xor of all elements */` ` ` `int` `set_bit_no; ` `/* Will have only single set bit of xor */` ` ` `int` `i; ` ` ` `*x = 0; ` ` ` `*y = 0; ` ` ` ` ` `/* Get the xor of all elements */` ` ` `for` `(i = 1; i < n; i++) ` ` ` `xor ^= arr[i]; ` ` ` ` ` `/* Get the rightmost set bit in set_bit_no */` ` ` `set_bit_no = xor & ~(xor-1); ` ` ` ` ` `/* Now divide elements in two sets by comparing rightmost set ` ` ` `bit of xor with bit at same position in each element. */` ` ` `for` `(i = 0; i < n; i++) ` ` ` `{ ` ` ` `if` `(arr[i] & set_bit_no) ` ` ` `*x = *x ^ arr[i]; ` `/*XOR of first set */` ` ` `else` ` ` `*y = *y ^ arr[i]; ` `/*XOR of second set*/` ` ` `} ` `} ` ` ` `/* Driver program to test above function */` `int` `main() ` `{ ` ` ` `int` `arr[] = {2, 3, 7, 9, 11, 2, 3, 11}; ` ` ` `int` `*x = (` `int` `*)` `malloc` `(` `sizeof` `(` `int` `)); ` ` ` `int` `*y = (` `int` `*)` `malloc` `(` `sizeof` `(` `int` `)); ` ` ` `get2NonRepeatingNos(arr, 8, x, y); ` ` ` `printf` `(` `"The non-repeating elements are %d and %d"` `, *x, *y); ` ` ` `getchar` `(); ` `} ` |

*chevron_right*

*filter_none*

**Time Complexity: **O(n)

**Auxiliary Space:** O(1)

Please refer below post for detailed explanation :

Find the two numbers with odd occurrences in an unsorted array

## Recommended Posts:

- Find elements of array using XOR of consecutive elements
- Find four elements a, b, c and d in an array such that a+b = c+d
- Find elements which are present in first array and not in second
- Find single in an array of 2n+1 integer elements
- Find array using different XORs of elements in groups of size 4
- Find even occurring elements in an array of limited range
- For each element in 1st array count elements less than or equal to it in 2nd array | Set 2
- For each element in 1st array count elements less than or equal to it in 2nd array
- Construct an array from XOR of all elements of array except element at same index
- Sum of elements from an array having even parity
- Elements that occurred only once in the array
- Find four elements that sum to a given value | Set 1 (n^3 solution)
- XOR of all elements of array with set bits equal to K
- Maximum set bit sum in array without considering adjacent elements
- Find four elements that sum to a given value | Set 2 ( O(n^2Logn) Solution)