Prim's Kruskal Algorithm

This is a discussion on Prim's Kruskal Algorithm within the C Programming forums, part of the General Programming Boards category; What property of the graph will result in prim's and kruskal's algorithm giving different minimum spanning tree's? Please help....

  1. #1
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    Prim's Kruskal Algorithm

    What property of the graph will result in prim's and kruskal's algorithm giving different minimum spanning tree's?

    Please help.

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    I believe that if the graph allows for negative weights, then the two algorithms will produce different results.

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    are you sure that the algorithm runs for graph's containing negative edge's?

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    C++まいる!Cをこわせ! Elysia's Avatar
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    Prim's algorithm cannot handle negative edges. Kruskal, OTOH, doesn't care.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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    can Prim’s yieeld different MST’s dependiing on which verteex was set as the startting point?

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    C++まいる!Cをこわせ! Elysia's Avatar
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    Do you have a theory? Have you thought about the question?
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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    Quote Originally Posted by Elysia View Post
    Do you have a theory? Have you thought about the question?
    I don't get your point?

    I think it will not give different MST's when the starting vertex is changed

    Please help.

  8. #8
    C++まいる!Cをこわせ! Elysia's Avatar
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    I am asking if you have put any thought to the question. For example, have you tried to think what happens if you changed the starting point? Have you tried doing an experiment by writing down on a paper or some such?
    Why do you think it won't change?
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  9. #9
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    i think the edges in the graph can change but the total edge cost cannot change. Any don't agree?

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