// vim:fileencoding=utf-8:foldmethod=marker

#ifndef GRAPH_H
#define GRAPH_H

/*	graph.h

	Header file for pointer-based graph data type
*/

/* Copyright 2003-2020 by Steven S. Skiena; all rights reserved.
Permission is granted for use in non-commerical applications
provided this copyright notice remains intact and unchanged.

These programs appear in my books:

"The Algorithm Design Manual" by Steven Skiena, second edition, Springer,
London 2008.  See out website www.algorist.com for additional information
or https://www.amazon.com/exec/obidos/ASIN/1848000693/thealgorith01-20

"Programming Challenges: The Programming Contest Training Manual"
by Steven Skiena and Miguel Revilla, Springer-Verlag, New York 2003.
See our website www.programming-challenges.com for additional information,
or https://www.amazon.com/exec/obidos/ASIN/0387001638/thealgorithmrepo/
*/

#include <stdbool.h>

/* #define _NULL       0       null pointer */

/*	DFS edge types		*/

#define TREE        0       /* tree edge */
#define BACK        1       /* back edge */
#define CROSS       2       /* cross edge */
#define FORWARD     3       /* forward edge */

/* [[[ graph_struct_cut */
/* [[[ maxv_cut */
#define MAXV        100     /* maximum number of vertices */
/* ]]] */

/* [[[ edge_struct_only_cut */
typedef struct edgenode {
    int y;                   /* adjacency info */
    int weight;              /* edge weight, if any */
    struct edgenode *next;   /* next edge in list */
} edgenode;
/* ]]] */

/* [[[ graph_struct_only_cut */
typedef struct {
    edgenode *edges[MAXV+1];  /* adjacency info */
    int degree[MAXV+1];       /* outdegree of each vertex */
    int nvertices;            /* number of vertices in the graph */
    int nedges;               /* number of edges in the graph */
    int directed;             /* is the graph directed? */
} graph;
/* ]]] */
/* ]]] */

void process_vertex_early(int v);
void process_vertex_late(int v);
void process_edge(int x, int y);

void initialize_graph(graph *g, bool directed);
void read_graph(graph *g, bool directed);
void print_graph(graph *g);
graph *transpose(graph *g);

#endif // !GRAPH_H
