测试用例过但全紫求调！

#include <bits/stdc++.h>
using namespace std;
int h[1000500][4];
bool s[101][101];
int dx[4]={-1,1,0,0};
int dy[4]={0,0,-1,1};
int main(){
	int n,m;
	cin >> n >> m;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			char x;
			cin >>x;
			if(x=='#') s[i][j]=0;
			else s[i][j]=1;
		}
	}
	h[1][0]=1;
	h[1][1]=1;
	h[1][2]=0;
	int head=0,tail=1;
	do{
		head++;
		for(int i=0;i<4;i++){
			int x=h[head][0]+dx[i];
			int y=h[head][1]+dy[i];
			if(x>0&&x<=n&&y>0&&y<=m&&s[x][y]){
				tail++;
				h[tail][0]=x;
				h[tail][1]=y;
				h[tail][2]=h[head][2]+1;
				if(x==n&&y==m){
					cout << "Yes";
					return 0;
				}
			}
		}
	}while(head < tail);
	cout << "No";
	return 0;
}