Full Schedule

Contains Dup, Valid Anagram, Two Sum, Group Anagrams, Top K

Product Except Self, Valid Sudoku, Encode/Decode, Longest Consecutive

Valid Palindrome, 3Sum, Container With Most Water, Trapping Rain Water

Best Stock, Longest Substr, Char Replacement, Permutation in String

Write pattern summaries. What did you struggle with? What was easy?

Binary Search, Search 2D Matrix, Koko Bananas, Find Min/Search Rotated

Valid Parentheses, Min Stack, RPE, Daily Temperatures, Largest Rectangle

Reverse LL, Merge Sorted, Cycle Detection, Remove Nth Node

Copy Random, LRU Cache, Merge K Lists, Add Two Numbers

Re-solve one problem you found hard without looking at solution

Invert, Max Depth, Diameter, Balance, Same, Subtree, LCA BST

Level Order, Right Side, Validate BST, Kth Smallest

Max Path Sum, Serialize/Deserialize, Build from Preorder+Inorder

K Closest Points, Find Median Data Stream, Merge K Sorted Lists

Focus: explain each solution to yourself out loud (rubber duck)

Climbing Stairs, House Robber I & II, Palindromic Substr, Coin Change

Decode Ways, LIS (O(n log n)), Word Break, Partition Equal Subset

Unique Paths, LCS, Edit Distance, Coin Change II

Number of Islands, Course Schedule I & II, Pacific Atlantic, Rotting Oranges

Max Subarray, Jump Game I & II, Merge Intervals, Meeting Rooms II

URL Shortener design (full) + Twitter Feed design (full)

Subsets, Combination Sum, Permutations — understand the template

All 4 algorithms, Redis implementation, distributed rate limiting

Redis deep dive, eviction policies, multi-channel notification system

Parking Lot, SOLID principles, design patterns (Factory, Observer, Strategy)

Re-solve 3–4 problems you struggled with this week without hints

Set 45-min timer. Pick random medium problem. Narrate your thinking.

Design Twitter. Use the 5-step framework (STAR-D). Time: 45 min.

Prepare 3 STAR stories: technical challenge, conflict, production incident

Complexity table, patterns cheatsheet, system design key numbers