Given an array of N integers, and an integer K, find the number of pairs of elements in the array whose sum is equal to K.
Example 1:
Input:
N = 4, K = 6
arr[] = {1, 5, 7, 1}
Output: 2
Explanation:
arr[0] + arr[1] = 1 + 5 = 6
and arr[1] + arr[3] = 5 + 1 = 6.
Practice links:
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Created and Instructed by:
Varsha Das
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