What do the absolute value bars mean in graph theory?
notation
Solution
The vertical bars indicate the cardinality (or size) of a set. In the case of Dijkstra's algorithm, `|E|` is the number of edges and `|V|` is the number of vertices.
Problem
Just wanted to know, for example in the wikipedia page Dijkstra's algorithm what the absolute value bars meant in `O(|E| + |V|log|V|)`