What is the initial flow on all edges in Ford-Fulkerson algorithm?
The flow of all the edges is 0 at the beginning.
What is the termination criterion for Ford-Fulkerson algorithm?
Since ˆG has finite edge capacities, we already know that any execution of the Ford- Fulkerson algorithm on input ˆG will terminate with a flow f whose value is equal to the minimum cut capacity in ˆG.
What is an augmenting path in Ford-Fulkerson?
The idea behind the algorithm is as follows: as long as there is a path from the source (start node) to the sink (end node), with available capacity on all edges in the path, we send flow along one of the paths. Then we find another path, and so on. A path with available capacity is called an augmenting path.
What does Ford-Fulkerson algorithm do?
The Ford-Fulkerson algorithm is used to detect maximum flow from start vertex to sink vertex in a given graph. Flow on an edge doesn’t exceed the given capacity of that graph. Incoming flow and outgoing flow will also equal for every edge, except the source and the sink.
Why is Ford-Fulkerson polynomial time?
1 Answer. Yes, the Ford-Fulkerson algorithm is a pseudopolynomial time algorithm. Its runtime is O(Cm), where C is the sum of the capacities leaving the start node. Since writing out the number C requires O(log C) bits, this runtime is indeed pseudopolynomial but not actually polynomial.
Does Ford-Fulkerson terminate?
Notes There are bad ways to choose augmenting paths such that with irrational capacities, the Ford-Fulkerson algorithm will not terminate. However, even with integral capacities, there are bad ways to choose augmenting paths so that the Ford-Fulkerson algorithm does not terminate in polynomial time.
Which of the following is associated with Ford-Fulkerson algorithm?
Explanation: Ford-Fulkerson algorithm uses the idea of residual graphs which is an extension of naïve greedy approach allowing undo operations.
What is the augmenting path?
Given a flow network , an augmenting path is a simple path from the source to the sink in the corresponding residual network . Intuitively, an augmenting path tells us how we can change the flow on certain edges in. so that we increase the overall flow from the source to the sink.
What is augmenting path in algorithm?
A path constructed by repeatedly finding a path of positive capacity from a source to a sink and then adding it to the flow (Skiena 1990, p. 237). Augmenting paths are used in the blossom algorithm and Hungarian maximum matching algorithm for finding graph maximum matchings. …
Where is Ford-Fulkerson algorithm used?
Also known as the max-flow algorithm, the Ford-Fulkerson algorithm is used to find the maximum amount of flow that can pass through the network from a particular source node to a particular sink node.
Why is Edmonds-Karp faster than Ford-Fulkerson?
Edmonds-Karp differs from Ford-Fulkerson in that it chooses the next augmenting path using breadth-first search (bfs). So, if there are multiple augmenting paths to choose from, Edmonds-Karp will be sure to choose the shortest augmenting path from the source to the sink.