Added solution

22. Pairs/solution.cpp

@@ -0,0 +1,44 @@
+/*
+    Topic : Algorithms
+    Subtopic : Pairs
+    Language : C++
+    Problem Statement :
+        Given an array of integers and a target value, determine the number of pairs of array elements that have a difference equal to the target value.
+    Url : https://www.hackerrank.com/challenges/pairs/problem
+*/
+#include <bits/stdc++.h>
+
+using namespace std;
+
+string ltrim(const string &);
+string rtrim(const string &);
+vector<string> split(const string &);
+
+/*
+ * Complete the 'pairs' function below.
+ *
+ * The function is expected to return an INTEGER.
+ * The function accepts following parameters:
+ *  1. INTEGER k
+ *  2. INTEGER_ARRAY arr
+ */
+
+int pairs(int k, vector<int> arr) {
+    map <int, int> m;
+    for(int x : arr)
+    {
+        m[x]++;
+    }
+    int c = 0;
+    int i;
+    for(i = 0; i < arr.size(); i++)
+    {
+        m[arr[i]]--;
+        if(m[k + arr[i]] > 0)
+        {
+            c++;
+        }
+        m[arr[i]]++;
+    }
+    return(c);
+}

22. Pairs/solution.py

@@ -0,0 +1,53 @@
+'''
+    Topic : Algorithms
+    Subtopic : Pairs
+    Language : Python 3
+    Problem Statement :
+        Given an array of integers and a target value, determine the number of pairs of array elements that have a difference equal to the target value.
+    Url : https://www.hackerrank.com/challenges/pairs/problem
+'''
+#!/bin/python3
+
+import os
+
+#
+# Complete the 'pairs' function below.
+#
+# The function is expected to return an INTEGER.
+# The function accepts following parameters:
+#  1. INTEGER k
+#  2. INTEGER_ARRAY arr
+#
+
+def pairs(k, arr):
+    # Write your code here
+    m = {}
+    for _ in arr:
+        if(_ not in m.keys()):
+            m[_] = 1
+        else:
+            m[_] += 1
+    c = 0
+    for i in range(len(arr)):
+        if((k + arr[i]) in m.keys()):
+            if(m[k + arr[i]] > 0):
+                c += 1
+        m[arr[i]] += 1
+    return(c)
+
+if __name__ == '__main__':
+    fptr = open(os.environ['OUTPUT_PATH'], 'w')
+
+    first_multiple_input = input().rstrip().split()
+
+    n = int(first_multiple_input[0])
+
+    k = int(first_multiple_input[1])
+
+    arr = list(map(int, input().rstrip().split()))
+
+    result = pairs(k, arr)
+
+    fptr.write(str(result) + '\n')
+
+    fptr.close()