Interview Prep Roadmap
A 4-week, pattern-by-pattern path through the core interview toolkit.
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Week 1 — Arrays, Hashing & Two Pointers
Build the muscle memory the rest of the plan leans on.
Two SumStart here
The canonical hash-map lookup. Start here.
Best Time to Buy and Sell Stock
Product of Array Except Self
Prefix/suffix products — no division allowed.
Group Anagrams
Top K Frequent Elements
Move Zeroes
Container With Most Water
3Sum
Sort + two pointers; watch the duplicate skipping.
Week 2 — Sliding Window, Stack & Binary Search
Longest Substring Without Repeating Characters
The template window problem.
Longest Repeating Character Replacement
Valid Parentheses
Min Stack
Daily Temperatures
Monotonic stack — keep indices, not values.
Search in Rotated Sorted Array
Find Minimum in Rotated Sorted Array
Koko Eating Bananas
Binary search on the answer, not the array.
Week 3 — Linked Lists & Trees
Reverse Linked List
Merge Two Sorted Lists
Linked List Cycle
Add Two Numbers
Symmetric Tree
Binary Tree Level Order Traversal
BFS with a level-size loop — reused everywhere.
Validate Binary Search Tree
Binary Tree Right Side View
Lowest Common Ancestor of a Binary Tree