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Pattern Learning Roadmap

What to study first based on interview frequency

You've explored 0/29 patterns

Tier 1: Must Know

10 patterns

Hash Map Counting

~2hBeginner

Two Pointers

~3hBeginner

Sliding Window

~3hBeginner

DFS (Pre/In/Post-Order)

~4hIntermediate

BFS (Level-Order)

~3hIntermediate

Binary Search

~4hBeginner

Greedy

~3hIntermediate

Two Sum Pattern

~2hBeginner

Backtracking

~4hIntermediate

Fibonacci Pattern

~3hBeginner

Tier 2: Should Know

8 patterns

Prefix Sum

~2hBeginner

Merge Intervals

~2hIntermediate

Topological Sort

~3hAdvanced

0/1 Knapsack

~4hIntermediate

Kadane's Algorithm

~1hBeginner

Bucket Sort / Top-K

~2hIntermediate

Monotonic Stack/Queue

~3hAdvanced

Trie

~3hAdvanced

Tier 3: Nice to Know

11 patterns

Fast & Slow Pointers

~2hBeginner

Linked List Reversal

~1hBeginner

Union-Find

~3hAdvanced

Longest Common Subsequence

~2hIntermediate

Two Heaps

~2hIntermediate

K-way Merge

~2hIntermediate

Unbounded Knapsack

~2hIntermediate

Bit Manipulation

~2hAdvanced

Cyclic Sort

~1hBeginner

DP on Trees

~3hAdvanced

Matrix / Grid DP

~2hIntermediate