diff --git a/left_rotate_by_D.cpp b/left_rotate_by_D.cpp
new file mode 100644
index 0000000..b24d85f
--- /dev/null
+++ b/left_rotate_by_D.cpp
@@ -0,0 +1,24 @@
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+
+void reverse(int arr[], int low, int high)
+{
+	while(low < high)
+	{
+		swap(arr[high], arr[low]);
+
+		low++;
+		high--;
+	}
+}   
+
+void leftRotate(int arr[], int d, int n)
+{
+	reverse(arr, 0, d - 1);
+
+	reverse(arr, d, n - 1);
+
+	reverse(arr, 0, n - 1);
+}