Merge 240acd1448 into e3bd7721c8

data_structures/binary_tree/avl_tree.py

@@ -196,8 +196,13 @@ def get_left_most(root: MyNode) -> Any:
 
 
 def del_node(root: MyNode, data: Any) -> MyNode | None:
+    if root is None:
+        print("Node is empty, nothing to delete")
+        return None
+
     left_child = root.get_left()
     right_child = root.get_right()
+
     if root.get_data() == data:
         if left_child is not None and right_child is not None:
             temp_data = get_left_most(right_child)
@@ -209,32 +214,40 @@ def del_node(root: MyNode, data: Any) -> MyNode | None:
             root = right_child
         else:
             return None
-    elif root.get_data() > data:
+    elif data < root.get_data():
         if left_child is None:
-            print("No such data")
+            print(f"No such data ({data}) exists in the left subtree.")
             return root
         else:
             root.set_left(del_node(left_child, data))
-    # root.get_data() < data
     elif right_child is None:
+        print(f"No such data ({data}) exists in the right subtree.")
         return root
     else:
         root.set_right(del_node(right_child, data))
 
-    if get_height(right_child) - get_height(left_child) == 2:
+    # Update the height of the node
+    root.set_height(
+        1 + my_max(get_height(root.get_left()), get_height(root.get_right()))
+    )
+
+    # Get the balance factor
+    balance_factor = get_height(root.get_right()) - get_height(root.get_left())
+
+    # Balance the tree
+    if balance_factor == 2:
         assert right_child is not None
         if get_height(right_child.get_right()) > get_height(right_child.get_left()):
             root = left_rotation(root)
         else:
             root = rl_rotation(root)
-    elif get_height(right_child) - get_height(left_child) == -2:
+    elif balance_factor == -2:
         assert left_child is not None
         if get_height(left_child.get_left()) > get_height(left_child.get_right()):
             root = right_rotation(root)
         else:
             root = lr_rotation(root)
-    height = my_max(get_height(root.get_right()), get_height(root.get_left())) + 1
-    root.set_height(height)
+
     return root
 
 

data_structures/trie/radix_tree.py

@@ -62,12 +62,17 @@ class RadixNode:
         -- A   (leaf)
         --- A   (leaf)
         """
-        # Case 1: If the word is the prefix of the node
+        # Case 1: If the word is empty, mark current node as leaf
+        if not word:
+            self.is_leaf = True
+            return
+
+        # Case 2: If the word is the prefix of the node
         # Solution: We set the current node as leaf
         if self.prefix == word and not self.is_leaf:
             self.is_leaf = True
 
-        # Case 2: The node has no edges that have a prefix to the word
+        # Case 3: The node has no edges that have a prefix to the word
         # Solution: We create an edge from the current node to a new one
         # containing the word
         elif word[0] not in self.nodes:
@@ -79,12 +84,12 @@ class RadixNode:
                 word
             )
 
-            # Case 3: The node prefix is equal to the matching
+            # Case 4: The node prefix is equal to the matching
             # Solution: We insert remaining word on the next node
             if remaining_prefix == "":
-                self.nodes[matching_string[0]].insert(remaining_word)
+                incoming_node.insert(remaining_word)
 
-            # Case 4: The word is greater equal to the matching
+            # Case 5: The word is greater equal to the matching
             # Solution: Create a node in between both nodes, change
             # prefixes and add the new node for the remaining word
             else:

greedy_methods/fractional_knapsack.py

@@ -39,9 +39,11 @@ def frac_knapsack(vl, wt, w, n):
     return (
         0
         if k == 0
-        else sum(vl[:k]) + (w - acc[k - 1]) * (vl[k]) / (wt[k])
-        if k != n
-        else sum(vl[:k])
+        else (
+            sum(vl[:k]) + (w - acc[k - 1]) * (vl[k]) / (wt[k])
+            if k != n
+            else sum(vl[:k])
+        )
     )
 
 

matrix/matrix_class.py

@@ -204,9 +204,11 @@ class Matrix:
         return Matrix(
             [
                 [
-                    self.minors().rows[row][column]
-                    if (row + column) % 2 == 0
-                    else self.minors().rows[row][column] * -1
+                    (
+                        self.minors().rows[row][column]
+                        if (row + column) % 2 == 0
+                        else self.minors().rows[row][column] * -1
+                    )
                     for column in range(self.minors().num_columns)
                 ]
                 for row in range(self.minors().num_rows)