Question: Given a directed - acyclic - graph ( DAG ) G of n vertices and m edges, let s and t be two vertices of

Given a directed

-

acyclic

-

graph

(

DAG

)

G of n vertices and m edges, let s and t be two vertices of G

.

We explained how to find the shortest path from s to t in G in our class. Will the algorithm still work if the edges have different lengths? What if some edges have negative lengths? Please justify your answer in detail.

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