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What we cover

Every part of data structures your course covers.

Linear

  • Dynamic arrays
  • Singly and doubly linked lists
  • Stacks and queues
  • Circular buffers

Trees

  • Binary search trees
  • AVL and red-black trees
  • Heaps
  • Tries

Hashing

  • Hash tables
  • Collision resolution
  • Hash sets and maps
  • Bloom filters

Graphs

  • Adjacency lists
  • BFS and DFS
  • Union-find
  • Topological sort
Example order

One data structures order, start to finish.

What the student uploaded, what came back, and how the price was set.

01The brief
Data StructuresUndergradDue in 3 days

AVL tree with rotations

Implement a self-balancing AVL tree with insert, delete and contains, plus a method that verifies the AVL invariant. Analyze the time complexity of each operation.

Requirements
  • Single and double rotations
  • Height stored in each node
  • isBalanced() invariant check
  • Randomized tests with 10,000 inserts
02The solution
AVLTree.java16 lines
1private Node insert(Node n, int key) {
2 if (n == null) return new Node(key);
3 if (key < n.key) n.left = insert(n.left, key);
4 else if (key > n.key) n.right = insert(n.right, key);
5 else return n; // no duplicates
6
7 update(n); // refresh height
8 int bf = balance(n);
9 // left heavy
10 if (bf > 1 && key < n.left.key) return rotateRight(n);
11 if (bf > 1) { n.left = rotateLeft(n.left); return rotateRight(n); }
12 // right heavy
13 if (bf < -1 && key > n.right.key) return rotateLeft(n);
14 if (bf < -1) { n.right = rotateRight(n.right); return rotateLeft(n); }
15 return n;
16}
18 tests passing · 10,000 random inserts balanced
03The explanation doc
explanation.pdf
1.
The four cases
Left-left and right-right need one rotation; left-right and right-left need two.
2.
Heights after rotation
update() runs bottom-up, so the child is fixed before its new parent.
3.
Why O(log n)
An AVL tree’s height is at most about 1.44 log₂ n, so every path is logarithmic.
04The price
AI predicted budget
$90–$160
Level · UndergradIncluded
Deadline · 3 daysStandard
Shown before any contact details were shared.
Final price from our team
$120
Delivered 7h early
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Typical orders

Common data structures assignments and typical budgets.

Linked list, stack or queue
$60–$130
Usually 2–3 days
typical range
BST, AVL or red-black tree
$90–$180
Usually 2–4 days
typical range
Hash table with collisions
$80–$160
Usually 2–3 days
typical range
Graph traversal project
$100–$220
Usually 3–5 days
typical range

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