Finished Sprint

names/binary_search_tree.py

@@ -0,0 +1,32 @@
+class BSTNode:
+    def __init__(self, value):
+        self.value = value
+        self.left = None
+        self.right = None
+
+    def insert(self, value):
+        if value < self.value:
+            if self.left == None:
+                self.left = BSTNode(value)
+            else:
+                self.left.insert(value)
+        else:
+            if self.right == None:
+                self.right = BSTNode(value)
+            else:
+                self.right.insert(value)
+
+    def contains(self, target):
+        if self.value == target:
+            return True
+        else:
+            if target < self.value:
+                if self.left == None:
+                    return False
+                else:
+                    return self.left.contains(target)
+            else:
+                if self.right == None:
+                    return False
+                else:
+                    return self.right.contains(target)

names/names.py

@@ -1,4 +1,5 @@
 import time
+from binary_search_tree import BSTNode
 
 start_time = time.time()
 
@@ -13,10 +14,12 @@
 duplicates = []  # Return the list of duplicates in this data structure
 
 # Replace the nested for loops below with your improvements
-for name_1 in names_1:
-    for name_2 in names_2:
-        if name_1 == name_2:
-            duplicates.append(name_1)
+bst = BSTNode("Name")
+for name in names_1:
+    bst.insert(name)
+for name in names_2:
+    if bst.contains(name):
+        duplicates.append(name)
 
 end_time = time.time()
 print (f"{len(duplicates)} duplicates:\n\n{', '.join(duplicates)}\n\n")

reverse/reverse.py

@@ -39,4 +39,10 @@ def contains(self, value):
         return False
 
     def reverse_list(self, node, prev):
-        pass
+        if node is None:
+            self.head = prev
+            return
+
+        next_node = node.get_next()
+        node.set_next(prev)
+        self.reverse_list(next_node, node)

ring_buffer/ring_buffer.py

@@ -1,9 +1,20 @@
 class RingBuffer:
     def __init__(self, capacity):
-        pass
+        self.capacity = capacity
+        self.storage = []
+        self.index = 0
 
     def append(self, item):
-        pass
+        if len(self.storage) < self.capacity:
+            self.storage.append(item)
+        else:
+            self.storage[self.index] = item
+
+        self.index += 1 
+
+        if self.index == self.capacity:
+            self.index = 0 
 
     def get(self):
-        pass
+        return self.storage
+