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# D1 Help Required on Maximum Flows watch

1. I need a decent person to explain better this stuff than the d1 heinemann book.( im having difficulty doing chap 8C) exam is on thursday too so it will be a nice recap for u guys as well.

I dont especially understand how to select flow-augmenting routes? do u select randomly and how does the back flow work? How do u find da minimum cuts? is there any tips to find it easily? I know dat max flow is da minimum cut but i can neva see which one it is and also for finding maximal flows by labelling whats the best procedure to use?

Yeh there r many qs but i just need a summarised way of doing these typical qs. Please help.. 3 days left for exaaam!
2. post some exampel questions if u want
3. TO find flow augmenting routes u have to look at the whole flow system.
If you are getting from A to Z or from the left to the right, u start from the left (source) and find routes where a flow is possible and end at the right(sink). Then this flow augmenting route will have the maximum flow of sumthing. This is ur first augmenting route. There may be more routes as well.

Once u have finished labelling the whole flow system, the maximum flow = the minimum cut.
Its a trial thing here.
If a maximum flow was 30. (I.e. You have 30 going out from the source)
U jus cut the routes/arcs so it actually splits the flow system in two.
U add up all the flows from the cut routes and if it adds up to 30 then max flow is 30. If it doesnt then u have to finds another cut elsewhere.
One tip to finding this is look at where the saturated routes/arcs are.
Where the flow = capacity of that route. The cut usually lies about that place.

I also have an exam too.
4. (Original post by DaveManUK)
post some exampel questions if u want
I agree with Dave.
Its hard to explain when u dont have a diagram as almost all of D1 required the information done on a diagram.
5. (Original post by goku999)
I agree with Dave.
Its hard to explain when u dont have a diagram as almost all of D1 required the information done on a diagram.
ok i will post qs tonite so u can explain me how u do it.. ty

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