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Arrays

Traversal, prefix sums, intervals and array patterns.

Aa

Strings

Manipulation, matching, parsing and string algorithms.

#

Hashing

Frequency maps, lookup optimization and sets.

⇆

Two Pointers

Solve array and string problems with coordinated pointers.

▣

Sliding Window

Master dynamic windows and contiguous subarrays.

⌕

Binary Search

Search spaces, monotonic predicates and answer search.

→

Linked List

Pointers, cycles, reversal and list transformations.

▤

Stack

Monotonic stacks, expression processing and simulation.