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#include<stdio.h>
int q[ 20 ], top = -1, front = -1, rear = -1, a[ 20 ][ 20 ], vis[ 20 ], stack[ 20 ];
int delete();
void add ( int item );
void bfs( int s, int n );
void dfs( int s, int n );
void push( int item );
int pop();
main()
{
int n, i, s, ch, j;
char c, dummy;
printf( "ENTER THE NUMBER VERTICES " );
scanf( "%d", &n );
for ( i = 1;i <= n;i++ )
{
for ( j = 1;j <= n;j++ )
{
printf( "ENTER 1 IF %d HAS A NODE WITH %d ELSE 0 ", i, j );
scanf( "%d", &a[ i ][ j ] );
}
}
printf( "THE ADJACENCY MATRIX IS\n" );
for ( i = 1;i <= n;i++ )
{
for ( j = 1;j <= n;j++ )
{
printf( " %d", a[ i ][ j ] );
}
printf( "\n" );
}
do
{
for ( i = 1;i <= n;i++ )
vis[ i ] = 0;
printf( "\nMENU" );
printf( "\n1.B.F.S" );
printf( "\n2.D.F.S" );
printf( "\nENTER YOUR CHOICE" );
scanf( "%d", &ch );
printf( "ENTER THE SOURCE VERTEX :" );
scanf( "%d", &s );
switch ( ch )
{
case 1:
bfs( s, n );
break;
case 2:
dfs( s, n );
break;
}
printf( "DO U WANT TO CONTINUE(Y/N) ? " );
scanf( "%c", &dummy );
scanf( "%c", &c );
}
while ( ( c == 'y' ) || ( c == 'Y' ) );
}
void bfs( int s, int n )
{
int p, i;
add
( s );
vis[ s ] = 1;
p = delete();
if ( p != 0 )
printf( " %d", p );
while ( p != 0 )
{
for ( i = 1;i <= n;i++ )
if ( ( a[ p ][ i ] != 0 ) && ( vis[ i ] == 0 ) )
{
add
( i );
vis[ i ] = 1;
}
p = delete();
if ( p != 0 )
printf( " %d ", p );
}
for ( i = 1;i <= n;i++ )
if ( vis[ i ] == 0 )
bfs( i, n );
}
void add
( int item )
{
if ( rear == 19 )
printf( "QUEUE FULL" );
else
{
if ( rear == -1 )
{
q[ ++rear ] = item;
front++;
}
else
q[ ++rear ] = item;
}
}
int delete()
{
int k;
if ( ( front > rear ) || ( front == -1 ) )
return ( 0 );
else
{
k = q[ front++ ];
return ( k );
}
}
void dfs( int s, int n )
{
int i, k;
push( s );
vis[ s ] = 1;
k = pop();
if ( k != 0 )
printf( " %d ", k );
while ( k != 0 )
{
for ( i = 1;i <= n;i++ )
if ( ( a[ k ][ i ] != 0 ) && ( vis[ i ] == 0 ) )
{
push( i );
vis[ i ] = 1;
}
k = pop();
if ( k != 0 )
printf( " %d ", k );
}
for ( i = 1;i <= n;i++ )
if ( vis[ i ] == 0 )
dfs( i, n );
}
void push( int item )
{
if ( top == 19 )
printf( "Stack overflow " );
else
stack[ ++top ] = item;
}
int pop()
{
int k;
if ( top == -1 )
return ( 0 );
else
{
k = stack[ top-- ];
return ( k );
}
}