Are These Two Friends? Adjacency Lists and Grids
Answer "are these two already friends?" in one step without running out of memory, before every Add friend button: why reading a friend list and a box for every pair both fall short at a million people, and how to choose between an adjacency list, a set per person and an adjacency matrix.
Updated

- Category
- Data Structures
- Level
- Journeyman
- Tags
- Adjacency List, Adjacency Matrix, data structures, Edge, Graph, Vertex