# How do you find all pairs of integer arrays whose sum is equal to a given number?

## How do you find all pairs of integer arrays whose sum is equal to a given number?

How to find all pairs of elements in Java array whose sum is equal to a given number?

1. Add each element in the array to all the remaining elements (except itself).
2. Verify if the sum is equal to the required number.
3. If true, print their indices.

### How do you find all pairs in an array of integers whose sum is equal to the given number in C?

Sorting solution:

1. Create three intermediate variables left, right, and countPair.
2. Initialize the left, right, and countPair variables with 0, n-1, and 0 respectively.
3. Now sort the array using the qsort inbuilt function.
4. If arr[leftIndex] + arr[rightIndex] is equal to ‘sum’, then we found a pair.

How can I find if a sum exists in a given array of integers?

Use two loops and check A[i] + A[j] == K for each pair (i, j) in A[]. If there exists a pair with sum equals to K then return true. By end of both loops, If you didn’t find such a pair then return false. Time Complexity = O(n²) and Space Complexity = O(1).

How do you find a pair in an array?

Solution Steps

1. We take a hash table of size equal to n.
2. We run a loop and scan over the array X[] for each X[i]. We check if targetSum – X[i] is present in the hash table or not. If yes, we have found the pair and return it true.
3. If didn’t find such a pair by end of the loop then, we return false.

## How do you find a pair of integers?

How to solve this problem efficiently? You are to find all pairs of integers such that their sum is equal to the given integer number N and the second number results from the first one by striking out one of its digits. The first integer always has at least two digits and starts with a non-zero digit.

### How do you find the number of pairs?

= n(n-1) / 2! = n(n-1) / 2 which is our formula for the number of pairs needed in at least n statements.

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How do you find the sum of an array?

To find the sum of elements of an array.

1. create an empty variable. ( sum)
2. Initialize it with 0 in a loop.
3. Traverse through each element (or get each element from the user) add each element to sum.
4. Print sum.

Is sum possible in array?

In order to find the sum of all elements in an array, we can simply iterate the array and add each element to a sum accumulating variable.

## How do you find possible pairs?

### How do you get the matching element in an integer array?

Create an empty Map then iterate over the array, and if the current number is not within the map add it to the map with value 1 , if the current element is already existing in the map then just increment it’s value ( val++ ), at the end you will have a map and for each key (each distinct number) you will have the …

What is the pair of integer where sum gives 9?

–>-15+6=-9.

What is the pair of integers whose sum is 7?

Therefore, 2 and 5 is a pair of integer whose sum is 7.

## How to find all pairs of an array whose sum is equal?

Let’s see the logic to how to find all pairs of an integer array whose sum is equal to a given sum. 1. Create three intermediate variables left, right, and countPair. 2. Initialize the left, right, and countPair variables with 0, n-1, and 0 respectively.