# Implementation of depth-first traversal of images c/c ++ DFS, deep dfs

Source: Internet
Author: User

Implementation of depth-first traversal of images c/c ++ DFS, deep dfs

# Include <iostream>

# Include <stdio. h>

# Include <stdlib. h>

# Include <string. h>

Using namespace std;

# Deprecision MAX 100

# Define LENGTH (a) (sizeof (a)/sizeof (a )

Int visited [MAX];

Typedef struct _ graph {

Char vexs [MAX];

Int vexnum;

Int edgnum;

Int matrix [MAX] [MAX];

} Graph, * PGgraph;

Static int get_position (Graph g, char ch ){

For (int I = 0; I <g. vexnum; I ++ ){

If (ch = g. vexs [I])

Return I;

}

Return-1;

}

Char ch;

While (! (Ch)> = 'A') & (ch) <= 'Z') | (ch)> = 'A ') & (ch) <= 'Z '))))

Ch = getchar ();

Return ch;

}

Graph creat_graph (){

Char c1, c2;

Int v, e;

Int p1, p2;

Graph pG;

Cout <"input number of vex> ";

Cin> v;

Cout <"input number of edge> ";

Cin> e;

// Memset (pG, 0, sizeof (Graph ));

PG. vexnum = v;

PG. edgnum = e;

// Initialize vexs

For (int I = 0; I <pG. vexnum; I ++ ){

// PG. vexs [I] = read_char ();

Cin> pG. vexs [I];

}

// Initialize edges

For (int I = 0; I <pG. edgnum; I ++ ){

Cin> c1> c2;

Cout <c1 <c2 <endl;

P1 = get_position (pG, c1 );

P2 = get_position (pG, c2 );

PG. matrix [p1] [p2] = 1;

PG. matrix [p2] [p1] = 1;

}

Return pG;

}

Static int next_vertex (Graph g, int v, int w ){

If (v <0 | v> g. vexnum-1 | w <0 | w> (g. vexnum-1) return-1;

For (int I = w + 1; I <g. vexnum; I ++ ){

If (g. matrix [v] [I] = 1) return I;

}

Return-1;

}

Static int first_vertex (Graph g, int v ){

If (v <0 | v> g. vexnum-1) return-1;

For (int I = 0; I <g. vexnum; I ++ ){

If (g. matrix [v] [I] = 1) return I;

}

Return-1;

}

Void DFS (Graph g, int I ){

If (visited [I] = 0 ){

Visited [I] = 1;

Cout <g. vexs [I] <"";

}

Int w = first_vertex (g, I );

For (; w> = 0; w = next_vertex (g, I, w )){

If (! Visited [w]) DFS (g, w );

}

}

Int main (int argc, const char * argv []) {

For (int I = 0; I <MAX; I ++ ){

Visited [I] = 0;

}

Graph g;

G = creat_graph ();

For (int I = 0; I <g. vexnum; I ++ ){

If (! Visited [I]) DFS (g, I );

}

Return 0;

}

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