# Non-overlapping sum of two sets

Given two arrays A[] and B[] of size n. It is given that both array individually contains distinct elements. We need to find the sum of all elements that are not common.

Examples:

```Input : A[] = {1, 5, 3, 8}
B[] = {5, 4, 6, 7}
Output : 29
1 + 3 + 4 + 6 + 7 + 8 = 29

Input : A[] = {1, 5, 3, 8}
B[] = {5, 1, 8, 3}
Output : 0
All elements are common.
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Brute Force Method :
One simple approach is that for each element in A[] check whether it is present in B[], if it is present in then add it to the result. Similarly, traverse B[] and for every element that is not present in B, add it to result.
Time Complexity: O(n^2).

Hashing concept :
Create an empty hash and insert elements of both arrays into it. Now traverse hash table and add all those elements whose count is 1. (As per the question, both arrays individually have distinct elements)

Below is the implementation of above approach:

## C++

 `// CPP program to find Non-overlapping sum ` `#include ` `using` `namespace` `std; ` ` `  ` `  `// function for calculating ` `// Non-overlapping sum of two array ` `int` `findSum(``int` `A[], ``int` `B[], ``int` `n) ` `{ ` `    ``// Insert elements of both arrays ` `    ``unordered_map<``int``, ``int``> hash;     ` `    ``for` `(``int` `i = 0; i < n; i++) { ` `        ``hash[A[i]]++; ` `        ``hash[B[i]]++; ` `    ``} ` ` `  `    ``// calculate non-overlapped sum ` `    ``int` `sum = 0; ` `    ``for` `(``auto` `x: hash)  ` `        ``if` `(x.second == 1) ` `            ``sum += x.first; ` `     `  `    ``return` `sum; ` `} ` ` `  `// driver code ` `int` `main() ` `{ ` `    ``int` `A[] = { 5, 4, 9, 2, 3 }; ` `    ``int` `B[] = { 2, 8, 7, 6, 3 }; ` `     `  `    ``// size of array ` `    ``int` `n = ``sizeof``(A) / ``sizeof``(A); ` ` `  `    ``// function call  ` `    ``cout << findSum(A, B, n);  ` `    ``return` `0; ` `} `

## Java

 `// Java program to find Non-overlapping sum  ` `import` `java.io.*; ` `import` `java.util.*; ` ` `  `class` `GFG  ` `{ ` ` `  `    ``// function for calculating  ` `    ``// Non-overlapping sum of two array  ` `    ``static` `int` `findSum(``int``[] A, ``int``[] B, ``int` `n) ` `    ``{ ` `        ``// Insert elements of both arrays ` `        ``HashMap hash = ``new` `HashMap<>(); ` `        ``for` `(``int` `i = ``0``; i < n; i++) ` `        ``{ ` `            ``if` `(hash.containsKey(A[i])) ` `                ``hash.put(A[i], ``1` `+ hash.get(A[i])); ` `            ``else` `                ``hash.put(A[i], ``1``); ` ` `  `            ``if` `(hash.containsKey(B[i])) ` `                ``hash.put(B[i], ``1` `+ hash.get(B[i])); ` `            ``else` `                ``hash.put(B[i], ``1``); ` `        ``} ` ` `  `        ``// calculate non-overlapped sum  ` `        ``int` `sum = ``0``; ` `        ``for` `(Map.Entry entry : hash.entrySet()) ` `        ``{ ` `            ``if` `(Integer.parseInt((entry.getValue()).toString()) == ``1``) ` `                ``sum += Integer.parseInt((entry.getKey()).toString()); ` `        ``} ` ` `  `        ``return` `sum; ` ` `  `    ``} ` ` `  `    ``// Driver code ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` `        ``int``[] A = { ``5``, ``4``, ``9``, ``2``, ``3` `};  ` `        ``int``[] B = { ``2``, ``8``, ``7``, ``6``, ``3` `};  ` ` `  `        ``// size of array  ` `        ``int` `n = A.length; ` ` `  `        ``// function call  ` `        ``System.out.println(findSum(A, B, n)); ` `    ``} ` `} ` ` `  `// This code is contributed by rachana soma `

## Python3

 `# Python3 program to find Non-overlapping sum  ` `from` `collections ``import` `defaultdict ` ` `  `# Function for calculating  ` `# Non-overlapping sum of two array  ` `def` `findSum(A, B, n):  ` ` `  `    ``# Insert elements of both arrays  ` `    ``Hash` `=` `defaultdict(``lambda``:``0``) ` `    ``for` `i ``in` `range``(``0``, n):  ` `        ``Hash``[A[i]] ``+``=` `1` `        ``Hash``[B[i]] ``+``=` `1` ` `  `    ``# calculate non-overlapped sum  ` `    ``Sum` `=` `0` `    ``for` `x ``in` `Hash``:  ` `        ``if` `Hash``[x] ``=``=` `1``:  ` `            ``Sum` `+``=` `x  ` `     `  `    ``return` `Sum` ` `  `# Driver code  ` `if` `__name__ ``=``=` `"__main__"``:  ` ` `  `    ``A ``=` `[``5``, ``4``, ``9``, ``2``, ``3``]  ` `    ``B ``=` `[``2``, ``8``, ``7``, ``6``, ``3``]  ` `     `  `    ``# size of array  ` `    ``n ``=` `len``(A)  ` ` `  `    ``# Function call  ` `    ``print``(findSum(A, B, n))  ` `     `  `# This code is contributed  ` `# by Rituraj Jain `

Output:

```39
```

This article is attributed to GeeksforGeeks.org

## tags:

Arrays Hash cpp-unordered_map Arrays Hash

code

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