Given an array Arr of N positive integers. Find the number of pairs of integers whose difference is equal to a given number K. Note: (a, b) and (b, a) are considered same. Also, same numbers at different indices are considered different.
Example 1:
Input:
N = 5
Arr[] = {1, 5, 3, 4, 2}
K = 3
Output: 2
Explanation: There are 2 pairs with difference 3,
the pairs are {1, 4} and {5, 2}
Example 2:
Input:
N = 6
Arr[] = {8, 12, 16, 4, 0, 20}
K = 4
Output: 5
Explanation: There are 5 pairs with difference 4,
the pairs are {0, 4}, {4, 8},
{8, 12}, {12, 16} and {16, 20}
Your Task:
You don't need to read input or print anything. Your task is to complete the function countPairsWithDiffK() which takes the array arr[],n and kas inputs and returns an integer denoting the answer.
Expected Time Complexity: O(N) Expected Auxiliary Space: O(max(Arri))
Constraints:
1 <= N <= 105
0 <= K <= 105
0 <= Arri <= 105
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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