diff --git a/eating_cookies/eating_cookies.py b/eating_cookies/eating_cookies.py
index aef505784..320c59acd 100644
--- a/eating_cookies/eating_cookies.py
+++ b/eating_cookies/eating_cookies.py
@@ -2,10 +2,13 @@
 Input: an integer
 Returns: an integer
 '''
-def eating_cookies(n):
-    # Your code here
-
-    pass
+def eating_cookies(n,):
+    
+    if n == 0:
+        return 1
+    if n < 0:
+        return 0
+    return eating_cookies(n-1) + eating_cookies(n-2) + eating_cookies(n-3)
 
 if __name__ == "__main__":
     # Use the main function here to test out your implementation
diff --git a/moving_zeroes/moving_zeroes.py b/moving_zeroes/moving_zeroes.py
index 2976ae48f..70f7993de 100644
--- a/moving_zeroes/moving_zeroes.py
+++ b/moving_zeroes/moving_zeroes.py
@@ -4,8 +4,10 @@
 '''
 def moving_zeroes(arr):
     # Your code here
-
-    pass
+    for i in arr:
+        if i == 0:
+            arr.append(arr.pop(arr.index(i)))
+    return arr
 
 
 if __name__ == '__main__':
diff --git a/product_of_all_other_numbers/product_of_all_other_numbers.py b/product_of_all_other_numbers/product_of_all_other_numbers.py
index 7d976257a..efcee8686 100644
--- a/product_of_all_other_numbers/product_of_all_other_numbers.py
+++ b/product_of_all_other_numbers/product_of_all_other_numbers.py
@@ -2,10 +2,18 @@
 Input: a List of integers
 Returns: a List of integers
 '''
+
+from functools import reduce
+
 def product_of_all_other_numbers(arr):
     # Your code here
+    prod = []
 
-    pass
+    for num in range(0, len(arr)):
+        prod.append(reduce(lambda x, y: x*y,
+        [x for i, x in enumerate(arr) if i != num]))
+    return prod
+    
 
 
 if __name__ == '__main__':
diff --git a/single_number/single_number.py b/single_number/single_number.py
index be6fd6278..18caeaa8e 100644
--- a/single_number/single_number.py
+++ b/single_number/single_number.py
@@ -4,8 +4,8 @@
 '''
 def single_number(arr):
     # Your code here
+    return 2 * sum(set(arr)) - sum(arr) 
 
-    pass
 
 
 if __name__ == '__main__':
diff --git a/sliding_window_max/sliding_window_max.py b/sliding_window_max/sliding_window_max.py
index 518ed36a2..eac7d8383 100644
--- a/sliding_window_max/sliding_window_max.py
+++ b/sliding_window_max/sliding_window_max.py
@@ -4,8 +4,11 @@
 '''
 def sliding_window_max(nums, k):
     # Your code here
-
-    pass
+    con = []
+    while k < len(nums) + 1:
+        con.append(max(nums[0:k]))
+        nums.pop(0)
+    return con
 
 
 if __name__ == '__main__':