Course Solutions Uncategorized (Solved) : 4 5 Pts Extra Credit Verifying Shortest Paths Sometimes One Verify Correctness Answers Eff Q33200632 . . . .

(Solved) : 4 5 Pts Extra Credit Verifying Shortest Paths Sometimes One Verify Correctness Answers Eff Q33200632 . . . .

 

4. (5 pts extra credit) Verifying Shortest Paths Sometimes one can verify the correctness of answers more efficiently than computing the answers. (We will revisit this idea when we cover NP Completeness.) For example You are organizing a programming competition where contestants implement Dijkstras algorithm under time pressure. Given an input graph G=(VE) and a starting vertex s e V, their programs are supposed to output tuples (v, v.d, v.TT) for each vertex vEV. Describe an O(V+E) algorithm that given the original graph G, starting vertex s and the output of such a program checks whether the program computed 

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