diff --git a/DailyQuestion/1052_Grumpy_bookstore_owner.py b/DailyQuestion/1052_Grumpy_bookstore_owner.py
new file mode 100644
index 0000000..f9eaa94
--- /dev/null
+++ b/DailyQuestion/1052_Grumpy_bookstore_owner.py
@@ -0,0 +1,35 @@
+def maxSatisfied(customers, grumpy, minutes):
+        """
+        :type customers: List[int]
+        :type grumpy: List[int]
+        :type minutes: int
+        :rtype: int
+        """
+        # Sliding Window Approach
+        i = 0
+        j = 0
+        sum_unsatisfied = 0
+        max_sum = float('-inf')
+
+        # Using sliding window
+        while j < len(grumpy):
+            if grumpy[j] == 1:  # Calculation part
+                sum_unsatisfied += customers[j]
+
+            if j - i + 1 < minutes:
+                j += 1
+            elif j - i + 1 == minutes:
+                max_sum = max(max_sum, sum_unsatisfied)
+                if grumpy[i] == 1:  # Removing calculation part using i
+                    sum_unsatisfied -= customers[i]
+                i += 1  # Sliding the window
+                j += 1
+
+        for k in range(len(customers)):  # Now finding only satisfied customers (grumpy[k] == 0)
+            if grumpy[k] == 0:
+                max_sum += customers[k]
+
+        return max_sum
+        
+        
+maxSatisfied([1,0,1,2,1,1,7,5], [0,1,0,1,0,1,0,1], 3)
\ No newline at end of file
diff --git a/NeetCodeRoadmap/Arrays_and_Hashing/66_Plus_One.py b/NeetCodeRoadmap/Arrays_and_Hashing/66_Plus_One.py
index 16a8b58..5694f1c 100644
--- a/NeetCodeRoadmap/Arrays_and_Hashing/66_Plus_One.py
+++ b/NeetCodeRoadmap/Arrays_and_Hashing/66_Plus_One.py
@@ -1,7 +1,18 @@
 def plusOne(digits):
     zeros = 0
     if digits[-1] == 9:
-        digits[-1] = 1
+        if len(digits) < 2:
+            digits[-1] = 1
+            digits.append(0)
+            return digits
+        for i in range(len(digits)):
+            if digits[i] == 9:
+                zeros += 1
+                if digits[i-1] == 9:
+                    digits[i] = 0
+                else:
+                    digits[i] = 1
+                    break
         digits.append(0)
     else:
         digits[-1] = digits[-1] + 1