diff --git a/Coding/Window Sliding Technique.cpp b/Coding/Window Sliding Technique.cpp
new file mode 100644
index 00000000..96a5e4e8
--- /dev/null
+++ b/Coding/Window Sliding Technique.cpp	
@@ -0,0 +1,35 @@
+// O(n*k) solution for finding maximum sum of
+// a subarray of size k
+#include <bits/stdc++.h>
+using namespace std;
+
+// Returns maximum sum in a subarray of size k.
+int maxSum(int arr[], int n, int k)
+{
+	// Initialize result
+	int max_sum = INT_MIN;
+
+	// Consider all blocks starting with i.
+	for (int i = 0; i < n - k + 1; i++) {
+		int current_sum = 0;
+		for (int j = 0; j < k; j++)
+			current_sum = current_sum + arr[i + j];
+
+		// Update result if required.
+		max_sum = max(current_sum, max_sum);
+	}
+
+	return max_sum;
+}
+
+// Driver code
+int main()
+{
+	int arr[] = { 1, 4, 2, 10, 2, 3, 1, 0, 20 };
+	int k = 4;
+	int n = sizeof(arr) / sizeof(arr[0]);
+	cout << maxSum(arr, n, k);
+	return 0;
+}
+
+// This code is contributed by Aditya Kumar (adityakumar129)
diff --git a/Matrix multiplication in C++.cpp b/Matrix multiplication in C++.cpp
new file mode 100644
index 00000000..a080f5bc
--- /dev/null
+++ b/Matrix multiplication in C++.cpp	
@@ -0,0 +1,48 @@
+#include <iostream>  
+using namespace std;  
+int main()  
+{  
+int a[10][10],b[10][10],mul[10][10],r,c,i,j,k;    
+cout<<"enter the number of row=";    
+cin>>r;    
+cout<<"enter the number of column=";    
+cin>>c;    
+cout<<"enter the first matrix element=\n";    
+for(i=0;i<r;i++)    
+{    
+for(j=0;j<c;j++)    
+{    
+cin>>a[i][j];  
+}    
+}    
+cout<<"enter the second matrix element=\n";    
+for(i=0;i<r;i++)    
+{    
+for(j=0;j<c;j++)    
+{    
+cin>>b[i][j];    
+}    
+}    
+cout<<"multiply of the matrix=\n";    
+for(i=0;i<r;i++)    
+{    
+for(j=0;j<c;j++)    
+{    
+mul[i][j]=0;    
+for(k=0;k<c;k++)    
+{    
+mul[i][j]+=a[i][k]*b[k][j];    
+}    
+}    
+}    
+//for printing result    
+for(i=0;i<r;i++)    
+{    
+for(j=0;j<c;j++)    
+{    
+cout<<mul[i][j]<<" ";    
+}    
+cout<<"\n";    
+}    
+return 0;  
+}