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.dsy:it. : Powered by vBulletin version 2.3.1 .dsy:it. > Didattica > Corsi N - Z > Ricerca operativa > [compitino] secondo compitino
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Archimonde
.consigliere.

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grazie :D :D l'esercizio è il 4 del 05-04-06
24-01-2007 15:18
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dicane
.illuminato.

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A me non tornano i conti con la sezione di capacita' minima... restano raggiungibili da s i nodi: 1,2,3 e ho flusso uscente dalla sezione pari a 45, il flusso entrante invece mi risulta 0.

Non so se devo considerare l'arco 4-1 con flusso entrante 5.. pero' avendolo caricato con 5 e successivamente scaricato di 5 il suo flusso dovrebbe essere 0...
24-01-2007 15:20
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monik
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Originally posted by monik
Qualcuno sa risolvere l'es 6 dell'appello 01/06/04?
e l'es 5 dell'appello 17/11/04?


proviamo a fare questi?

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24-01-2007 15:20
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Archimonde
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xkè 0??
xkè è scarico?
24-01-2007 15:24
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XXXX
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fatto
mi viene 45
S=0,1,2,3
archi uscenti grafo originale=20+25=45
ok!!


cammini:
s-3,4,2-t
s-3-4-1-2-t
s-1-2-4-t
s-3-4-t
s-1-2-t
s-1-4-t

Last edited by XXXX on 24-01-2007 at 15:31
24-01-2007 15:25
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Archimonde
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aspè a me il flusso ora viene 45... xkè c'è anche s,1,2,4,t di flusso 5, cioè quello residuo sull'arco 2-4...
24-01-2007 15:33
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Archimonde
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ottimo allora ^^
24-01-2007 15:34
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monik
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Originally posted by XXXX
fatto
mi viene 45
S=0,1,2,3
archi uscenti grafo originale=20+25=45
ok!!


cammini:
s-3,4,2-t
s-3-4-1-2-t
s-1-2-4-t
s-3-4-t
s-1-2-t
s-1-4-t


ma non puo essere 20+25=45 perchè S=0,1,2,3 ha anche un 15 in uscita da S quindi è: 20+25+15=60

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24-01-2007 15:43
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XXXX
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quindi valore flusso max=45?
sezione d capacita minima?!?
e l'opportuno insieme d archi cn un associato peso unitario etc etc
come s fanno?sono domande sempre dello stesso esercizio..
24-01-2007 15:43
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XXXX
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Originally posted by monik
ma non puo essere 20+25=45 perchè S=0,1,2,3 ha anche un 15 in uscita da S quindi è: 20+25+15=60



no perche il valore 15 è tra l'arco 2 e 3
ma siccome fanno entrambi parte d s nn s considera
24-01-2007 15:45
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Archimonde
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allora mi illuminate sui tagli di gomoury?
24-01-2007 15:45
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monik
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Originally posted by XXXX
no perche il valore 15 è tra l'arco 2 e 3
ma siccome fanno entrambi parte d s nn s considera


ma 3 non fa parte di S perche non è piu raggiungibile da s!

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24-01-2007 15:47
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Archimonde
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si valore flusso max 45, la sezione di capacitò minima non è s,1,2,3? o mi confondo con il taglio di F-F??
24-01-2007 15:48
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XXXX
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dal nodo 2 è raggiungibile...e alla fine nn devi considerare tutti i nodi raggiungibili da quelli che fanno gia parte d s?!?
24-01-2007 15:48
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Archimonde
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non è raggiungibile? intendi non posso percorrere la strada s-1-2-3?
24-01-2007 15:49
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