Breaking the Sorting Barrier for Directed Single-Source Shortest Paths [pdf]

Abstract:

We give a deterministic O(m log2/3 n)-time algorithm for single-source shortest paths (SSSP) on directed graphs with real non-negative edge weights in the comparison-addition model.

This is the first result to break the O(m + n log n) time bound of Dijkstra’s algorithm on sparse graphs, showing that Dijkstra’s algorithm is not optimal for SSSP.