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BFS 为何Runtime Error?

Posted by Paige at 2014-08-09 17:30:55 on Problem 2248
#include <stdio.h>
#include <string.h>
int now,later,n,a[100];
struct P
{
    int cur,p_pre;
}q[10000];
void bfs()
{
	now=-1;
	later=0;
    P head,i_s,j_s;
	head.cur=1;
	head.p_pre=-1;
	q[0]=head;
    while (1)
    {
        now++;
		i_s=q[now];
        int i=now,j=now;
        while(i>=0)
		{
			j_s=i_s;
              while(j>=0)
			  {
        	      later++;
                  q[later].cur=q[i].cur+q[j].cur;
                  q[later].p_pre=now;
                  if (q[later].cur==n)  return;
			      j=j_s.p_pre;
			      j_s=q[j_s.p_pre];
			  }			      
			  i=i_s.p_pre;
			  i_s=q[i_s.p_pre];
		}
    }
}
void getflo()
{
	a[0]=later;

	int i=1;
    while (q[later].p_pre!=0)
    {
        a[i++]=q[later].p_pre;
        later=q[later].p_pre;
    }
    a[i]=0;
    while(i)
	{
		printf("%d ",q[a[i]].cur);
		i--;
		
	}
	printf("%d\n",n);
}


int main()
{
	while(scanf("%d",&n),n)
	{   
	
	    if(n>1)
		{
		bfs();
		getflo();
		}
		else 		printf("%d\n",n);

	}

    return 0;
}

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