void main();
#include <stdio.h>
#define width (rings+1)
void main()
{
int rings, last, next, x, z[500], s[3];
printf("how many rings? "); scanf("%d",&rings);
for(x=1; x<=rings; x++)
z[x]=width-x;
for(x=0; x<=2*width; x+=width)
z[x]=1000;
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])
{
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;
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;
z[last*width+s[last]]=z[next*width+s[next]+1];
}
}
请帮我把关键的地方尤其是WHILE循环里的判断条件为什么要这样判断说一下!!