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Maximum Flow Algorithms
Algorithms

Detailed Description

This group contains the algorithms for finding maximum flows and feasible circulations [6], [1].

The maximum flow problem is to find a flow of maximum value between a single source and a single target. Formally, there is a $G=(V,A)$ digraph, a $cap: A\rightarrow\mathbf{R}^+_0$ capacity function and $s, t \in V$ source and target nodes. A maximum flow is an $f: A\rightarrow\mathbf{R}^+_0$ solution of the following optimization problem.

\[ \max\sum_{sv\in A} f(sv) - \sum_{vs\in A} f(vs) \]

\[ \sum_{uv\in A} f(uv) = \sum_{vu\in A} f(vu) \quad \forall u\in V\setminus\{s,t\} \]

\[ 0 \leq f(uv) \leq cap(uv) \quad \forall uv\in A \]

LEMON contains several algorithms for solving maximum flow problems:

In most cases the Preflow algorithm provides the fastest method for computing a maximum flow. All implementations also provide functions to query the minimum cut, which is the dual problem of maximum flow.

Circulation is a preflow push-relabel algorithm implemented directly for finding feasible circulations, which is a somewhat different problem, but it is strongly related to maximum flow. For more information, see Circulation.

Classes

class  Circulation< GR, LM, UM, SM, TR >
 Push-relabel algorithm for the network circulation problem. More...
 
class  EdmondsKarp< GR, CAP, TR >
 Edmonds-Karp algorithms class. More...
 
class  Preflow< GR, CAP, TR >
 Preflow algorithm class. More...
 
struct  Circulation< GR, LM, UM, SM, TR >::SetElevator< T >
 Named parameter for setting Elevator type More...
 
struct  Circulation< GR, LM, UM, SM, TR >::SetFlowMap< T >
 Named parameter for setting FlowMap type More...
 
struct  Circulation< GR, LM, UM, SM, TR >::SetStandardElevator< T >
 Named parameter for setting Elevator type with automatic allocation More...
 
struct  EdmondsKarp< GR, CAP, TR >::SetFlowMap< T >
 
struct  Preflow< GR, CAP, TR >::SetElevator< T >
 Named parameter for setting Elevator type More...
 
struct  Preflow< GR, CAP, TR >::SetFlowMap< T >
 Named parameter for setting FlowMap type More...
 
struct  Preflow< GR, CAP, TR >::SetStandardElevator< T >
 Named parameter for setting Elevator type with automatic allocation More...
 

Files

file  circulation.h
 Push-relabel algorithm for finding a feasible circulation.
 
file  edmonds_karp.h
 Implementation of the Edmonds-Karp algorithm.
 
file  preflow.h
 Implementation of the preflow algorithm.