Class DirectedGraph<V, E>

Type Parameters

Hierarchy

Implements

  • IDirectedGraph<V, E>

Constructors

Properties

_inEdgeMap: Map<V, E[]> = ...
_outEdgeMap: Map<V, E[]> = ...
_vertices: Map<VertexId, V> = ...

Methods

  • The addEdge function adds an edge to a graph if the source and destination vertices exist.

    Parameters

    • edge: E

      The parameter edge is of type E, which represents an edge in the graph. It contains information about the source vertex (src) and the destination vertex (dest) of the edge.

    Returns boolean

    The addEdge function returns a boolean value. It returns true if the edge was successfully added to the graph, and false if either the source or destination vertices of the edge are not present in the graph.

  • The addVertex function adds a new vertex to a graph if it does not already exist.

    Parameters

    • newVertex: V

      The parameter "newVertex" is of type V, which represents a vertex in a graph.

    Returns boolean

    The method is returning a boolean value. If the newVertex is already contained in the graph, it will return false. Otherwise, it will add the newVertex to the graph and return true.

  • BellmanFord time:O(VE) space:O(V) one to rest pairs The bellmanFord function implements the Bellman-Ford algorithm to find the shortest path from a source vertex to all other vertices in a graph, and optionally detects negative cycles and generates the minimum path.

    Parameters

    • src: VertexId | V

      The src parameter is the source vertex from which the Bellman-Ford algorithm will start calculating the shortest paths. It can be either a vertex object or a vertex ID.

    • Optional scanNegativeCycle: boolean

      A boolean flag indicating whether to scan for negative cycles in the graph.

    • Optional getMin: boolean

      The getMin parameter is a boolean flag that determines whether the algorithm should calculate the minimum distance from the source vertex to all other vertices in the graph. If getMin is set to true, the algorithm will find the minimum distance and update the min variable with the minimum

    • Optional genPath: boolean

      A boolean flag indicating whether to generate paths for all vertices from the source vertex.

    Returns {
        distMap: Map<V, number>;
        hasNegativeCycle: undefined | boolean;
        min: number;
        minPath: V[];
        paths: V[][];
        preMap: Map<V, V>;
    }

    The function bellmanFord returns an object with the following properties:

    • distMap: Map<V, number>
    • hasNegativeCycle: undefined | boolean
    • min: number
    • minPath: V[]
    • paths: V[][]
    • preMap: Map<V, V>
  • The function checks if there is an edge between two vertices in a graph.

    Parameters

    • v1: VertexId | V

      The parameter v1 can be either a VertexId or a V. A VertexId represents the identifier of a vertex in a graph, while V represents the type of the vertex itself.

    • v2: VertexId | V

      The parameter v2 represents the second vertex in an edge. It can be either a VertexId or a V type.

    Returns boolean

    The function containsEdge returns a boolean value. It returns true if there is an edge between the vertices v1 and v2, and false otherwise.

  • The function checks if a vertex exists in a graph.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can accept either a vertex object (V) or a vertex ID (VertexId).

    Returns boolean

    The method containsVertex returns a boolean value.

  • The function "degreeOf" returns the total degree of a vertex, which is the sum of its out-degree and in-degree.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can be either a VertexId or a V.

    Returns number

    the sum of the out-degree and in-degree of the specified vertex or vertex ID.

  • Dijkstra algorithm time: O(logVE) space: O(V + E) The dijkstra function implements Dijkstra's algorithm to find the shortest path between a source vertex and an optional destination vertex, and optionally returns the minimum distance, the paths, and other information.

    Parameters

    • src: VertexId | V

      The src parameter represents the source vertex from which the Dijkstra algorithm will start. It can be either a vertex object or a vertex ID.

    • Optional dest: null | VertexId | V

      The dest parameter is the destination vertex or vertex ID. It specifies the vertex to which the shortest path is calculated from the source vertex. If no destination is provided, the algorithm will calculate the shortest paths to all other vertices from the source vertex.

    • Optional getMinDist: boolean

      The getMinDist parameter is a boolean flag that determines whether the minimum distance from the source vertex to the destination vertex should be calculated and returned in the result. If getMinDist is set to true, the minDist property in the result will contain the minimum distance

    • Optional genPaths: boolean

      The genPaths parameter is a boolean flag that determines whether or not to generate paths in the Dijkstra algorithm. If genPaths is set to true, the algorithm will calculate and return the shortest paths from the source vertex to all other vertices in the graph. If genPaths @returns The function dijkstrareturns an object of typeDijkstraResult`.

    Returns DijkstraResult<V>

  • Dijkstra algorithm time: O(VE) space: O(V + E) The function dijkstraWithoutHeap implements Dijkstra's algorithm to find the shortest path between two vertices in a graph without using a heap data structure.

    Parameters

    • src: VertexId | V

      The source vertex from which to start the Dijkstra's algorithm. It can be either a vertex object or a vertex ID.

    • Optional dest: null | VertexId | V

      The dest parameter in the dijkstraWithoutHeap function is an optional parameter that specifies the destination vertex for the Dijkstra algorithm. It can be either a vertex object or its identifier. If no destination is provided, the value is set to null.

    • Optional getMinDist: boolean

      The getMinDist parameter is a boolean flag that determines whether the minimum distance from the source vertex to the destination vertex should be calculated and returned in the result. If getMinDist is set to true, the minDist property in the result will contain the minimum distance

    • Optional genPaths: boolean

      The genPaths parameter is a boolean flag that determines whether or not to generate paths in the Dijkstra algorithm. If genPaths is set to true, the algorithm will calculate and return the shortest paths from the source vertex to all other vertices in the graph. If genPaths @returns The function dijkstraWithoutHeapreturns an object of typeDijkstraResult`.

    Returns DijkstraResult<V>

  • The function "edgesOf" returns an array of both outgoing and incoming edges of a given vertex or vertex ID.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can be either a VertexId or a V.

    Returns E[]

    The function edgesOf returns an array of edges.

  • Floyd algorithm time: O(V^3) space: O(V^2), not support graph with negative weight cycle all pairs The function implements the Floyd-Warshall algorithm to find the shortest path between all pairs of vertices in a graph.

    Returns {
        costs: number[][];
        predecessor: (null | V)[][];
    }

    The function floyd() returns an object with two properties: costs and predecessor. The costs property is a 2D array of numbers representing the shortest path costs between vertices in a graph. The predecessor property is a 2D array of vertices (or null) representing the predecessor vertices in the shortest path between vertices in the

    • costs: number[][]
    • predecessor: (null | V)[][]
  • The function getAllPathsBetween finds all paths between two vertices in a graph using depth-first search.

    Parameters

    • v1: VertexId | V

      The parameter v1 represents either a vertex object (V) or a vertex ID (VertexId). It is the starting vertex for finding paths.

    • v2: VertexId | V

      The parameter v2 represents the destination vertex or its ID. It is the vertex that we want to find paths to from the starting vertex v1.

    Returns V[][]

    an array of arrays of vertices (V[][]). Each inner array represents a path between the given vertices (v1 and v2).

  • The function getDestinations returns an array of destination vertices connected to a given vertex.

    Parameters

    • vertex: null | VertexId | V

      The vertex parameter represents the starting vertex from which we want to find the destinations. It can be either a V object, a VertexId (which is a unique identifier for a vertex), or null if we want to find destinations from all vertices.

    Returns V[]

    an array of vertices (V[]).

  • The function getEdge returns the first edge between two vertices, given their source and destination.

    Parameters

    • srcOrId: null | VertexId | V

      The srcOrId parameter can be either a vertex object (V), a vertex ID (VertexId), or null. It represents the source vertex of the edge.

    • destOrId: null | VertexId | V

      The destOrId parameter is either a vertex object (V), a vertex ID (VertexId), or null. It represents the destination vertex of the edge.

    Returns null | E

    an edge (E) or null.

  • The function "getEdgeDest" returns the vertex associated with the destination of an edge.

    Parameters

    • e: E

      The parameter e is of type E, which represents an edge in a graph.

    Returns null | V

    either a vertex object (of type V) or null.

  • The function "getEdgeSrc" returns the source vertex of an edge, or null if the edge does not exist.

    Parameters

    • e: E

      E - an edge object

    Returns null | V

    the source vertex of the given edge, or null if the edge does not exist.

  • The function "getEndsOfEdge" returns the source and destination vertices of an edge if it exists in the graph, otherwise it returns null.

    Parameters

    • edge: E

      The parameter "edge" is of type E, which represents an edge in a graph.

    Returns null | [V, V]

    an array containing two vertices [V, V] if the edge is found in the graph. If the edge is not found, it returns null.

  • The function getMinCostBetween calculates the minimum cost between two vertices in a graph, either based on edge weights or using a breadth-first search algorithm.

    Parameters

    • v1: VertexId | V

      The parameter v1 represents the starting vertex or vertex ID of the graph.

    • v2: VertexId | V

      The parameter v2 represents the second vertex in the graph. It can be either a vertex object or a vertex ID.

    • Optional isWeight: boolean

      isWeight is an optional parameter that indicates whether the graph edges have weights. If isWeight is set to true, the function will calculate the minimum cost between v1 and v2 based on the weights of the edges. If isWeight is set to false or not provided, the function will calculate the

    Returns null | number

    The function getMinCostBetween returns a number representing the minimum cost between two vertices (v1 and v2) in a graph. If the isWeight parameter is true, it calculates the minimum weight between the vertices. If isWeight is false or not provided, it calculates the minimum number of edges between the vertices. If the vertices are not

  • The function getMinPathBetween returns the minimum path between two vertices in a graph, either based on weight or using a breadth-first search algorithm.

    Parameters

    • v1: VertexId | V

      The parameter v1 represents the starting vertex or its ID.

    • v2: VertexId | V

      The parameter v2 represents the destination vertex or its ID. It is the vertex that we want to find the minimum path to from the source vertex v1.

    • Optional isWeight: boolean

      A boolean flag indicating whether to consider the weight of edges in finding the minimum path. If set to true, the function will use Dijkstra's algorithm to find the minimum weighted path. If set to false, the function will use breadth-first search (BFS) to find the minimum path. If

    Returns null | V[]

    The function getMinPathBetween returns an array of vertices (V[]) representing the minimum path between two vertices (v1 and v2). If no path is found, it returns null.

  • The function getNeighbors returns an array of neighboring vertices for a given vertex or vertex ID.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can be either a vertex object (V) or a vertex ID (VertexId).

    Returns V[]

    an array of vertices (V[]).

  • The function calculates the sum of weights along a given path.

    Parameters

    • path: V[]

      An array of vertices (V) representing a path in a graph.

    Returns number

    The function getPathSumWeight returns the sum of the weights of the edges in the given path.

  • The function getVertex returns the vertex object associated with a given vertex ID or vertex object, or null if it does not exist.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can be either a VertexId or a V.

    Returns null | V

    The function getVertex returns the vertex object (V) corresponding to the given vertexOrId parameter. If the vertex is found in the _vertices map, it is returned. Otherwise, null is returned.

  • The function getVertexId returns the id of a vertex, whether it is passed as an instance of AbstractVertex or as a VertexId.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can be either a vertex object (V) or a vertex ID (VertexId).

    Returns VertexId

    the id of the vertex.

  • The function "inDegreeOf" returns the number of incoming edges for a given vertex.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can be either a VertexId or a V.

    Returns number

    The number of incoming edges of the specified vertex or vertex ID.

  • The function incomingEdgesOf returns an array of incoming edges for a given vertex or vertex ID.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can be either a vertex object (V) or a vertex ID (VertexId).

    Returns E[]

    The method incomingEdgesOf returns an array of edges (E[]).

  • The function outDegreeOf returns the number of outgoing edges from a given vertex.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can be either a VertexId or a V.

    Returns number

    The number of outgoing edges from the specified vertex or vertex ID.

  • The function outgoingEdgesOf returns an array of outgoing edges from a given vertex or vertex ID.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can accept either a vertex object (V) or a vertex ID (VertexId).

    Returns E[]

    The method outgoingEdgesOf returns an array of outgoing edges from a given vertex or vertex ID.

  • The function removeAllEdges removes all edges between two vertices.

    Parameters

    • src: VertexId | V

      The src parameter represents the source vertex from which the edges will be removed. It can be either a VertexId or a V type, which represents the identifier or object of the vertex.

    • dest: VertexId | V

      The dest parameter represents the destination vertex of an edge. It can be either a VertexId or a vertex object V.

    Returns E[]

    An empty array is being returned.

  • The function removes all vertices from a graph and returns a boolean indicating if any vertices were removed.

    Parameters

    • vertices: VertexId[] | V[]

      The vertices parameter can be either an array of vertices (V[]) or an array of vertex IDs (VertexId[]).

    Returns boolean

    a boolean value. It returns true if at least one vertex was successfully removed, and false if no vertices were removed.

  • The removeEdge function removes an edge from a graph and returns the removed edge, or null if the edge was not found.

    Parameters

    • edge: E

      The edge parameter is an object that represents an edge in a graph. It has two properties: src and dest, which represent the source and destination vertices of the edge, respectively.

    Returns null | E

    The method removeEdge returns the removed edge (E) if it exists, or null if the edge does not exist.

  • The function removes an edge between two vertices in a directed graph and returns the removed edge.

    Parameters

    • srcOrId: VertexId | V

      The source vertex or its ID.

    • destOrId: VertexId | V

      The destOrId parameter in the removeEdgeBetween function represents the destination vertex of the edge that needs to be removed. It can be either a vertex object (V) or a vertex ID (VertexId).

    Returns null | E

    The function removeEdgeBetween returns the removed edge (E) if the edge between the source and destination vertices is successfully removed. If either the source or destination vertex is not found, or if the edge does not exist, it returns null.

  • The removeVertex function removes a vertex from a graph by its ID or by the vertex object itself.

    Parameters

    • vertexOrId: VertexId | V

      The parameter vertexOrId can be either a vertex object (V) or a vertex ID (VertexId).

    Returns boolean

    The method removeVertex returns a boolean value.

  • The function sets the weight of an edge between two vertices in a graph.

    Parameters

    • srcOrId: VertexId | V

      The srcOrId parameter can be either a VertexId or a V object. It represents the source vertex of the edge.

    • destOrId: VertexId | V

      The destOrId parameter represents the destination vertex of the edge. It can be either a VertexId or a vertex object V.

    • weight: number

      The weight parameter represents the weight of the edge between the source vertex (srcOrId) and the destination vertex (destOrId).

    Returns boolean

    a boolean value. If the edge exists between the source and destination vertices, the function will update the weight of the edge and return true. If the edge does not exist, the function will return false.

  • Tarjan is an algorithm based on DFS,which is used to solve the connectivity problem of graphs. Tarjan can find cycles in directed or undirected graph Tarjan can find the articulation points and bridges(critical edges) of undirected graphs in linear time, Tarjan solve the bi-connected components of undirected graphs; Tarjan can find the SSC(strongly connected components), articulation points, and bridges of directed graphs. The tarjan function is used to perform various graph analysis tasks such as finding articulation points, bridges, strongly connected components (SCCs), and cycles in a graph.

    Parameters

    • Optional needArticulationPoints: boolean

      A boolean value indicating whether or not to calculate and return the articulation points in the graph. Articulation points are the vertices in a graph whose removal would increase the number of connected components in the graph.

    • Optional needBridges: boolean

      A boolean flag indicating whether the algorithm should find and return the bridges (edges whose removal would increase the number of connected components in the graph).

    • Optional needSCCs: boolean

      A boolean value indicating whether the Strongly Connected Components (SCCs) of the graph are needed. If set to true, the function will calculate and return the SCCs of the graph. If set to false, the SCCs will not be calculated or returned.

    • Optional needCycles: boolean

      A boolean flag indicating whether the algorithm should find cycles in the graph. If set to true, the algorithm will return a map of cycles, where the keys are the low values of the SCCs and the values are arrays of vertices that form cycles within the SCCs.

    Returns {
        SCCs: Map<number, V[]>;
        articulationPoints: V[];
        bridges: E[];
        cycles: Map<number, V[]>;
        dfnMap: Map<V, number>;
        lowMap: Map<V, number>;
    }

    The function tarjan returns an object with the following properties:

    • SCCs: Map<number, V[]>
    • articulationPoints: V[]
    • bridges: E[]
    • cycles: Map<number, V[]>
    • dfnMap: Map<V, number>
    • lowMap: Map<V, number>
  • when stored with adjacency list time: O(V+E) when stored with adjacency matrix time: O(V^2) The topologicalSort function performs a topological sort on a directed graph and returns the sorted vertices in reverse order, or null if the graph contains a cycle.

    Returns null | (VertexId | V)[]

    The function topologicalSort() returns an array of vertices in topological order if there is no cycle in the graph. If there is a cycle in the graph, it returns null.

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