shortest single cycle in an unweighted graph n<=1e6
shortest single cycle in an unweighted graph n<=1e6
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Is it a directed or an undirected graph?
If it's an undirected graph, you can construct a DFS Tree, and every back-edge defines a cycle
Shortest cycle length here $$$= 3$$$, not defined by only one back edge
I think this can help you
orz dequy hai
dijme pupil rack
It can't be solved in better than $$$O(nm)$$$, where $$$m$$$ is the number of edges.
https://en.m.wikipedia.org/wiki/Girth_(graph_theory)#Computation