大佬求调

#include<iostream>
using namespace std;
char map[1003][1003];
int main()
{
	int n,m;
	cin>>n>>m;
	char faek='A'-1;
	int x,y;
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=m;j++)
		{
			cin>>map[i][j];
			if(map[i][j]!='#')
			{
				if(map[i][j]>faek)
				{
					faek=map[i][j];
					x=i;
					y=j;
				}
			}
		}
	}
	cout<<map[x][y];
	int xx[]={0,-1,0,0,1};
	int yy[]={0,0,-1,1,0};
	char fak=(char)(0);
	int ansx=-1,ansy=-1;
	for(int i=1;i<=4;i++)
	{
		int nx=x+xx[i];
		int ny=y+yy[i];
		if(map[nx][ny]!='#'&&nx>=1&&nx<=n&&ny>=1&&ny<=m&&map[nx][ny]>fak)
		{
			fak=map[nx][ny];
			ansx=nx;
			ansy=ny;
		}
	}
	if(ansx==ansy&&ansx==-1)return 0;
	if(map[ansx][ansy]==map[x][y])return 0;
	cout<<map[ansx][ansy];
	return 0;
}

50分不知道错哪里了