void main();
#include <stdio.h>
#define width (rings+1)
void main()
{
intrings, last, next, x, z[500], s[3];
printf("how many rings? "); scanf("%d",&rings);
for(x=1; x<=rings; x++) /* putrings on first peg */
z[x]=width-x;
for(x=0; x<=2*width; x+=width) /* set base for each peg */
z[x]=1000;
/* if even number of rings, put first ringon second peg; if odd, on third */
if(rings%2==0)
{
last=1; s[2]=0; s[1]=1;
z[width+1]=z[rings];
}
else
{
last=2; s[1]=0; s[2]=1;
z[2*width+1]=z[rings];
}
printf("from 1 to %d\n",last+1); s[0]=rings-1;
while(s[0]+s[1]) /* while firstand second pegs aren't empty */
{
/* next ring to move is smaller of rings onthe two pegs not moved onto last */
if(last==0) next=z[width+s[1]]<z[2*width+s[2]]?1:2;
if(last==1) next=z[s[0]]<z[2*width+s[2]]?0:2;
if(last==2) next=z[s[0]]<z[width+s[1]]?0:1;
/* top ring of 'to' peg must be larger andan even 'distance' away */ if((z[next*width+s[next]])>(z[last*width+s[last]])||((z[last*width+s[last]]-z[next*width+s[next]])%2==0))
last=3-next-last;
printf("from %d to %d\n",next+1,last+1);
s[next]=s[next]-1; s[last]=s[last]+1; /* move from 'next' to 'last' peg*/
z[last*width+s[last]]=z[next*width+s[next]+1];
}
}
