Given a directed graph, searchZeroCycle search paths
in it that forms a zero weight cycle. The function finishes
when found one cycle.
Usage
searchZeroCycle(nodes, arcs)
Arguments
nodes
vector containing the nodes of the graph,
identified by a number that goes from $1$ to the
order of the graph.
arcs
matrix with the list of arcs of the graph.
Each row represents one arc. The first two columns
contain the two endpoints of each arc and the third
column contains their weights.
Value
searchZeroCycle returns a vector with the nodes and
a matrix with a list of arcs of the cycle found.