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Depends on method for finding augmenting path.

Use breadth-first search (Edmonds-Karp Algorithm). Thus, the augmenting path is shortest from s to t.

Theorem 27.9

The total number of augmentations is , per augmentation. Thus the algorithm has run time O(VE2).

Preflow-Push method yields O(V2E) (Section 27.4), and
Lift-to-Front method yields O(
V3) (Section 27.5).

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