Python (Micro)

Master the small Python code shapes that combine into full algorithms and data-structure solutions.

Values & Types

Scripts, a sorted variable shelf, numeric behavior, sentinels, and type hints.

List construction, copying, mutation, matrices, and prefix accumulation.

Lookup, counting, grouping, membership, and nested collections.

Branches, loop forms, comprehensions, two pointers, and sliding windows.

Signatures, unpacking, closures, recursive base cases, and caching.

Bare nodes, linked structures, tries, dataclasses, protocols, and shared references.

List-backed stacks, conditional deque operations, BFS frontiers, and monotonic deques.

Key functions, deterministic tie-breakers, bisect helpers, and manual bounds.

Separate min/max heap facets, priority tuples, and disjoint-set compression.

Adjacency lists, BFS, DFS, grid movement, indegrees, and topological order.

Rolling state, memoized grids, mutable paths, snapshots, and undo steps.

Masks, XOR, digit carry, Unicode, byte data, parsing, exceptions, and assertions.

Verify the compact Python forms used by algorithm and data-structure solutions.