# Divide array into two arrays which does not contain any pair with sum K

Given an array arr[] consisting of N non-negative distinct integers and an integer K, the task is to distribute the array in two arrays such that both the arrays does not contain a pair with sum K.

Examples:

Input: arr[] = {1, 0, 2, 3, 4, 7, 8, 9}, K = 4
Output:
3, 2, 4, 7, 8, 9
0, 1
Explanation: Pairs (1, 3) and (0, 4) from the given array cannot be placed in the same array. Therefore, 0, 1 can be placed in an array and 3, 4 can be placed in the other array. The remaining array elements can be placed in any of the two arrays.

Input: arr[] = {0, 1, 2, 4, 5, 6, 7, 8, 9}, K = 7
Output:
0, 1, 2, 4
5, 6, 7, 9, 8

Approach: The idea is to traverse the array and place the array elements greater than K / 2 in one array and the remaining elements in the other array. Follow the steps below to solve the problem:

• Initialize two separate vectors first and second to store the two distributed arrays.
• Since all the array elements are distinct, elements greater than K/2 can be stored in one array and the remaining elements in the other.
• Traverse the given array and for each element, check if arr[i] is greater than K/2 or not. If found to be true, insert that element into vector second. Otherwise, insert it into vector first.
• After complete traversal of the array, print elements in both the vectors.

Below is the implementation of the above approach:

## C++

 `// C++ program for the above approach` `#include ` `using` `namespace` `std;`   `// Function to split the given` `// array into two separate arrays` `// satisfying given condition` `void` `splitArray(``int` `a[], ``int` `n,` `                ``int` `k)` `{` `    ``// Stores resultant arrays` `    ``vector<``int``> first, second;`   `    ``// Traverse the array` `    ``for` `(``int` `i = 0; i < n; i++) {`   `        ``// If a[i] is smaller than` `        ``// or equal to k/2` `        ``if` `(a[i] <= k / 2)` `            ``first.push_back(a[i]);` `        ``else` `            ``second.push_back(a[i]);` `    ``}`   `    ``// Print first array` `    ``for` `(``int` `i = 0; i < first.size();` `         ``i++) {` `        ``cout << first[i] << ``" "``;` `    ``}`   `    ``// Print second array` `    ``cout << ``"\n"``;` `    ``for` `(``int` `i = 0; i < second.size();` `         ``i++) {` `        ``cout << second[i] << ``" "``;` `    ``}` `}`   `// Driver Code` `int` `main()` `{`   `    ``// Given K` `    ``int` `k = 5;`   `    ``// Given array` `    ``int` `a[] = { 0, 1, 3, 2, 4, 5,` `                ``6, 7, 8, 9, 10 };`   `    ``// Given size` `    ``int` `n = ``sizeof``(a)` `            ``/ ``sizeof``(``int``);`   `    ``splitArray(a, n, k);`   `    ``return` `0;` `}`

## Java

 `// Java program for the above approach ` `import` `java.util.*;`   `class` `GFG{` ` `  `// Function to split the given` `// array into two separate arrays` `// satisfying given condition` `static` `void` `splitArray(``int` `a[], ``int` `n,` `                       ``int` `k)` `{` `    `  `    ``// Stores resultant arrays` `    ``Vector first = ``new` `Vector<>();` `    ``Vector second = ``new` `Vector<>();`   `    ``// Traverse the array` `    ``for``(``int` `i = ``0``; i < n; i++)` `    ``{` `        `  `        ``// If a[i] is smaller than` `        ``// or equal to k/2` `        ``if` `(a[i] <= k / ``2``)` `            ``first.add(a[i]);` `        ``else` `            ``second.add(a[i]);` `    ``}` ` `  `    ``// Print first array` `    ``for``(``int` `i = ``0``; i < first.size(); i++)` `    ``{` `        ``System.out.print(first.get(i) + ``" "``);` `    ``}` ` `  `    ``// Print second array` `    ``System.out.println();` `    ``for``(``int` `i = ``0``; i < second.size(); i++)` `    ``{` `        ``System.out.print(second.get(i) + ``" "``);` `    ``}` `}` ` `  `// Driver Code` `public` `static` `void` `main(String[] args)` `{` `    `  `    ``// Given K` `    ``int` `k = ``5``;` ` `  `    ``// Given array` `    ``int` `a[] = { ``0``, ``1``, ``3``, ``2``, ``4``, ``5``,` `                ``6``, ``7``, ``8``, ``9``, ``10` `};` ` `  `    ``int` `n = a.length;` `    `  `    ``splitArray(a, n, k);` `}` `}`   `// This code is contributed by code_hunt`

## Python3

 `# Python3 program for the above approach`   `# Function to split the given` `# array into two separate arrays` `# satisfying given condition` `def` `splitArray(a, n, k):` `    `  `    ``# Stores resultant arrays` `    ``first ``=` `[]` `    ``second ``=` `[]`   `    ``# Traverse the array` `    ``for` `i ``in` `range``(n):` `        `  `        ``# If a[i] is smaller than` `        ``# or equal to k/2` `        ``if` `(a[i] <``=` `k ``/``/` `2``):` `            ``first.append(a[i])` `        ``else``:` `            ``second.append(a[i])`   `    ``# Print first array` `    ``for` `i ``in` `range``(``len``(first)):` `        ``print``(first[i], end ``=` `" "``)`   `    ``# Print second array` `    ``print``(``"\n"``, end ``=` `"")` `    ``for` `i ``in` `range``(``len``(second)):` `        ``print``(second[i], end ``=` `" "``)`   `# Driver Code` `if` `__name__ ``=``=` `'__main__'``:` `    `  `    ``# Given K` `    ``k ``=` `5` `    `  `    ``# Given array` `    ``a ``=`  `[ ``0``, ``1``, ``3``, ``2``, ``4``, ``5``,` `           ``6``, ``7``, ``8``, ``9``, ``10` `]` `           `  `    ``n ``=`  `len``(a)` `    `  `    ``splitArray(a, n, k)` `    `  `# This code is contributed by bgangwar59`

## C#

 `// C# program for the above approach` `using` `System;` `using` `System.Collections.Generic;`   `class` `GFG{` `  `  `// Function to split the given` `// array into two separate arrays` `// satisfying given condition` `static` `void` `splitArray(``int``[] a, ``int` `n,` `                       ``int` `k)` `{` `    `  `    ``// Stores resultant arrays` `    ``List<``int``> first = ``new` `List<``int``>();` `    ``List<``int``> second = ``new` `List<``int``>();`   `    ``// Traverse the array` `    ``for``(``int` `i = 0; i < n; i++)` `    ``{` `        `  `        ``// If a[i] is smaller than` `        ``// or equal to k/2` `        ``if` `(a[i] <= k / 2)` `            ``first.Add(a[i]);` `        ``else` `            ``second.Add(a[i]);` `    ``}` `  `  `    ``// Print first array` `    ``for``(``int` `i = 0; i < first.Count; i++)` `    ``{` `        ``Console.Write(first[i] + ``" "``);` `    ``}` `  `  `    ``// Print second array` `    ``Console.WriteLine();` `    ``for``(``int` `i = 0; i < second.Count; i++)` `    ``{` `        ``Console.Write(second[i] + ``" "``);` `    ``}` `}` `  `  `// Driver Code` `public` `static` `void` `Main()` `{` `    `  `    ``// Given K` `    ``int` `k = 5;` `  `  `    ``// Given array` `    ``int``[] a = { 0, 1, 3, 2, 4, 5,` `                ``6, 7, 8, 9, 10 };` `  `  `    ``int` `n = a.Length;` `     `  `    ``splitArray(a, n, k);` `}` `}` `  `  `// This code is contributed by susmitakundugoaldanga`

## Javascript

 ``

Output:

```0 1 2
3 4 5 6 7 8 9 10```

Time Complexity: O(N), where N is the size of the given array.
Auxiliary Space: O(1)

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