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睡醒来才发现原来那16种操作可以提前存起来,差别居然这么大!汗...In Reply To:BFS能过吗?我的为什么还超时,请牛人指点!谢谢! Posted by:nuanran at 2006-08-15 08:19:36 > #include <stdio.h>
> #include <string.h>
> #define MAXN 131100
> int mat[MAXN];
> int queue[MAXN];
> int father[MAXN];
> int path[MAXN];
> int op[MAXN];
> int main()
> {
> char map[6][6];
> int t,count,top,tmp,i,j,k,p,f;
> t=0;
> count=0;
> for(i=0;i<4;i++)
> {
> scanf("%s",map[i]);
> for(j=0;j<4;j++)
> {
> if(map[i][j]=='+') t+=(1<<count);
> count++;
> }
> }
> if(t==0) printf("0\n");
> else
> {
> top=0;
> queue[0]=t;
> father[0]=-1;
> memset(mat,0,sizeof(mat));
> mat[t]=1;
> f=0;
> for(i=0;i<=top;i++)
> {
> for(j=0;j<4;j++)
> {
> for(k=0;k<4;k++)
> {
> tmp=queue[i];
> for(p=j*4;p<j*4+4;p++) tmp^=(1<<p);
> for(p=k;p<16;p+=4)
> {
> if(p/4==j) continue;
> tmp^=(1<<p);
> }
> if(!mat[tmp])
> {
> top++;
> queue[top]=tmp;
> father[top]=i;
> path[top]=j*4+k;
> mat[tmp]=1;
> if(tmp==0) f=1;
> }
> if(f) break;
> }
> if(f) break;
> }
> if(f) break;
> }
> count=-1;
> while(top>0)
> {
> count++;
> op[count]=path[top];
> top=father[top];
> }
> printf("%d\n",count+1);
> for(i=count;i>=0;i--) printf("%d %d\n",op[i]/4+1,op[i]%4+1);
> }
> //while(1);
> return 0;
> }
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