modify the Bellman-Ford algorithm
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Show how to modify the Bellman-Ford algorithm to find and print a negative weight cycle (reachable from the source, s) in a weighted directed graph G if one exists. If there is no negative weight cycle, your algorithm should print out "no negative weight cycle reachable from". If there is a negative weight cycle reachable from the source vertex, your algorithm should display one such cycle.
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for v in V
d[v]=infinity
d[s] = 0
for (i = 1 to |V|-1)
for each (u,v) in E
if (d[v] > d[u] + w(u, v))
d[v]=d[u] + w(u, v)
parent[v] = u
for ...
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