Strongly Connected Components
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Problem Description
Connectivity in an undirected graph means that every vertex can reach every other vertex via any path. If the graph is not connected the graph can be broken down into Connected Components.
Strong Connectivity applies only to directed graphs. A directed graph is strongly connected if there is a directed path from any vertex to every other vertex. This is same as connectivity in an undirected graph, the only difference being strong connectivity applies to directed graphs and there should be directed paths instead of just paths. Similar to connected components, a directed graph can be broken down into Strongly Connected Components.
Bounds Chart
Step Chart
Improvement Table
Complexity Classes  Algorithm Paper Links  Lower Bounds Paper Links 

Exp/Factorial  
Polynomial > 3  
Cubic  
Quadratic  Paul Purdom; 1970 (1970)  
nlogn  Munro’s algorithm (1971)  
Linear  Kosaraju's algorithm (1978)
Tarjan's strongly connected components algorithm (1972) Pathbased strong components algorithm; Dikjstra (1976) 

logn 