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求助,测的题里给的数据都对,为什么WA了?

Posted by ChineseTea at 2018-07-21 23:35:08 on Problem 2488
#include<stdio.h>
#include<string.h>
int a[8][2]={{-1,-2},{1,-2},{-2,-1},{2,-1},{-2,1},{2,1},{-1,2},{1,2}};
int p,q;
bool judge[27][27];
int fx[27],fy[27];
bool dfs(int x,int y,int num);
int main()
{ 
	int n,k,m;
	while(scanf("%d",&n) != EOF)
	{
		for(m=1;m<=n;m++)
		{
			memset(judge,false,sizeof(judge));
			judge[1][1]=true;
			scanf("%d%d",&p,&q);
			printf("Scenario #%d:\n",n);
			if(dfs(1,1,1))
			{
				for(k=1;k<=p*q;k++)
				printf("%c%d",fy[k],fx[k]);
			}
			else
			printf("impossible");
			printf("\n\n");
		}
	}
}
bool dfs(int x,int y,int num)
{
	fx[num]=x;fy[num]=y+'A'-1;
	int i,nx,ny;
	if(num==p*q)
	return true;
	for(i=0;i<8;i++)
	{
		nx=x+a[i][0];
		ny=y+a[i][1];
		if(nx<=p&&nx>=1&&ny<=q&&ny>=1&&!judge[nx][ny])
		{
			judge[nx][ny]=true;
			if(dfs(nx,ny,num+1))
			return true;
			else
			judge[nx][ny]=false;
		}
	}
	return false;
}

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