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<pre align="left"><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"><b>
<font color="#0033CC">Program:</font> <font color="#FF0000">find equivalence classes </font> O(m+ n)
<font color="#FF0000">m</font> ~ the number of related pairs input
<font color="#FF0000">n</font> ~ the number of objects
#include <stdio.h>
#include <alloc.h>
#define MAX_SIZE 24
#define IS_FULL(ptr) (!(ptr))
#define FALSE 0
#define TRUE 1
typedef struct node *node_opinter;
typedef sreuct node {
int data;
node_pointer link;
};
void <font color="#FF0033">main</font>(void)
{ short int out[MAX_SIZE];
node_pointer seq[MAX_SIZE];
node_pointer x,y,top;
int i,j,n;
printf("Enter the size (<= %d) ",MAX_SIZE);
scanf("%d",&n);
for ( i = 0; i<n; i++ ) {<i><font size="3" color="#FF0099"> /* initialize seq and out */</font></i>
out[i] = TRUE; seq[i] = NULL;
}
<i><font size="3" color="#FF0099">/* Phase 1: Input the equivalence pairs: */</font></i>
printf("Enter a pair of numbers ( -1 -1 to quit) : ");
scanf("%d%d",&i,&j);
while ( i>=0 ) {
x = (node_pointer)malloc(sizeof(node));
if ( IS_FULL(x) ) {
fprintf(stderr,"The memory is full\n");
exit(1);
}
x->data = j; x->link = seq[i]; seq[i] = x;
x = (node_pointer)malloc(sizeof(node));
if ( IS_FULL(x) ) {
printf(stderr, "The memory is full\n");
exit(1);
}
x->data = i; x->link = seq[j]; seq[j] = x;
printf("Enter a pair of number (-1 -1 to quit): ");
scanf("%d%d",&i,&j);
}</b></font></pre>
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<pre><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"><b><i><font size="3" color="#FF0099">/* Phase 2: output the equivalence classes */</font></i>
for ( i = 0; i<n; ++i )
if ( out [i] ) {
printf("\nNew class: %5d",i);
out[i] = FALSE; <i><font size="3" color="#FF0099">/* set class to false</font></i>
x = seq[i]; top = NULL; <i><font size="3" color="#FF0099">/* initialize stack */</font></i>
for ( ; ; ) { <i><font size="3" color="#FF0099">/* find rest of class */</font></i>
while ( x ) { <i><font size="3" color="#FF0099"> /* process list */</font></i>
j = x->data;
if ( out[j] ) {
printf("%5d",j); out[j] = FALSE;
y = x->link; x->link = top; top = x; x = y;
}
else x = x->link;
}
if ( !top ) break;</b></font></pre>
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<pre><img src="IMAGE/CH4-19.gif" width="156" height="199"></pre>
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<pre align="left"><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"><b> <i><font size="3" color="#FF0099"> /* unstack */</font></i>
x = seq[top->data]; top = top->link;
}
}
}</b></font>
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