#include <stdio.h>
int main()
{
 int count=1;
 while(1)
 {
	 int i,a[6],s=0,k=0,k1=0;
	 for(i=0;i<6;i++)
	 {
		 scanf("%d",a+i);
		 if(a[i]==0) k++;
		 if((i+1)%2==0) a[i]=a[i]%2;
		 else 
		 { 
			 if((i+1)!=1) a[i]=a[i]%12;
		 }
		 s+=a[i]*(i+1);
	 }
	 if(k==6) break;
	 if(s%2==1) 
	 {
		printf("Collection #%d:\nCan't be divided.\n\n",count++);
		 continue;
	 }
	 int mid=s/2;
	 int j=0;
	 for(i=5;i>=0;i--)
	 {   
		 for(j=0;j<a[i];j++)
		 {
			 mid-=i+1;
			 if(mid<=0) break;
		 }
		 if(mid<0) mid+=i+1;
		 if(mid==0)
		 {
	    printf("Collection #%d:\nCan be divided.\n\n",count++);
		 break;
		 }
		 if(i==0&&mid>0)
		 {
			 int t;
			 i=5;
			 k1=0;;
			 mid=s/2;
			 for(t=5;t>=0;t--) //回溯
			 {		
				 if(a[t]>0) 
				 {
					 a[t]--;
					 break;
				 }
				 else k1++;
			 }
		 }
		 if(k1==6) break; 

	 }
   if(mid>0)
   {
	   printf("Collection #%d:\nCan't be divided.\n\n",count++);
   }
 }
   return 0;
 }

我用随机数测了好几百次都没错，一提交就WA,郁闷死了。