Added sliding windows technique logic

CPP/Window sliding technique.txt

@@ -0,0 +1,33 @@
+////////////////////////////////////////////////////////////////////
+///////////////WINDOW SLIDING TECHNIQUE/////////////////////////////
+////ref- https://www.geeksforgeeks.org/window-sliding-technique/////////////////////////////
+#include <bits/stdc++.h>
+using namespace std;
+#define beastslayer ios_base::sync_with_stdio(false);cin.tie(NULL);
+#define ll long long
+
+//Q- Find the maximum sum of a k length subarray from a given array
+
+int main()
+{
+    beastslayer;
+
+    int arr[10]={5,1,-9,2,3,5,7,11,12,50};
+    int k;   //Length of subarrays
+    cin>>k;
+
+    int max_sum=0;        //Final answer to be found
+    for(int i=0;i<k;++i)
+        max_sum+=arr[i];
+
+    int window_sum=max_sum;  //current window pane sum
+
+    for(int i=k;i<10;++i)
+    {
+        window_sum+=arr[i]-arr[i-k];    //going to every element and removing the one (i-k)th for creating new pale window
+        max_sum=max(window_sum,max_sum);
+    }
+    cout<<max_sum<<endl;
+
+    return 0;
+}