added Maximum Sum of Distinct Subarrays With Length K problem

Hashing/Maximum Sum of Distinct Subarrays With Length K.cpp

@@ -0,0 +1,51 @@
+class Solution
+{
+public:
+    long long maximumSubarraySum(vector<int> &nums, int k)
+    {
+        long long maxSum = 0;
+        long long sumOfCurr = 0;
+        unordered_map<int, int> mp;
+        int n = nums.size();
+        int countOfSame = 0;
+        for (int i = 0; i < k; i++)
+        {
+            if (mp[nums[i]] > 0)
+            {
+                countOfSame++;
+            }
+            mp[nums[i]] += 1;
+            sumOfCurr += nums[i];
+        }
+
+        if (countOfSame == 0)
+        {
+            maxSum = max(sumOfCurr, maxSum);
+        }
+        int i = k;
+        while (i < n)
+        {
+            sumOfCurr -= nums[i - k];
+            if (mp[nums[i - k]] > 1)
+            {
+                countOfSame--;
+            }
+            mp[nums[i - k]] -= 1;
+
+            if (mp[nums[i]])
+            {
+                countOfSame++;
+            }
+            mp[nums[i]] += 1;
+            sumOfCurr += nums[i];
+
+            if (countOfSame == 0)
+            {
+                maxSum = max(sumOfCurr, maxSum);
+            }
+            i++;
+        }
+
+        return maxSum;
+    }
+};