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jan31.cpp
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#include<iostream>
using namespace std;
bool check(char a[1000][1000],int m,int n)
{
int i,j;
if(a[0][0]=='W'||a[0][n-1]=='W')
{
return 0;
}
if(a[0][0]=='A')
{
if(a[0][0]=='W')
return 0;
}
if(a[0][0]=='B')
{
if(a[1][0]=='A')
return 0;
}
if(a[m-1][n-1]=='A')
{
if(a[m-2][n-1]=='W'||a[m-2][n-2]=='W'||a[m-2][n-1]=='B')
return 0;
}
if(a[m-1][0]=='A')
{
if(a[m-1][1]=='W'||a[m-2][0]=='W'||a[m-2][0]=='B')
return 0;
}
if(a[m-1][0]=='W'||a[m-1][n-1]=='W')
return 0;
for(i=1;i<m-1;i++)
{
if(a[i][0]=='B')
{
if(a[i+1][0]=='A'||a[i+1][0]=='W')
return 0;
}
else if(a[i][0]=='A')
{
if(a[i][1]=='W')
return 0;
}
if(a[i][n-1]=='B')
{
if(a[i+1][n-1]=='A'||a[i+1][n-1]=='W')
return 0;
}
else if(a[i][n-1]=='A')
{
if(a[i][n-2]=='W')
return 0;
}
if(a[i][0]=='W'||a[i][n-1]=='W')
return 0;
}
for(i=1;i<n-1;i++)
{
if(a[0][i]=='B')
{
if(a[1][i]=='A')
return 0;
}
else if(a[0][i]=='A')
{
if(a[0][i-1]=='W'||a[0][i+1]=='W')
return 0;
}
else if(a[0][i]=='W')
{
if(a[0][i-1]=='A'||a[0][i+1]=='A'||a[1][i]=='A')
return 0;
}
if(a[m-1][i]=='W')
{
if(a[m-1][i-1]=='A'||a[m-1][i+1]=='A'||a[m-2][i]=='B')
return 0;
}
else if(a[m-1][i]=='A')
{
if(a[m-1][i-1]=='W'||a[m-1][i+1]=='W'||a[m-2][i]=='W'||a[m-2][i]=='B')
return 0;
}
}
return 1;
}
int main()
{
char a[1000][1000];
int no,m,n,i,j,flag;
cin>>no;
while(no--)
{
cin>>m>>n;
for(i=0;i<m;i++)
for(j=0;j<n;j++)
cin>>a[i][j];
flag=0;
if(check(a,m,n))
{
for(i=1;i<m-1;i++)
{
for(j=1;j<n-1;j++)
{
if(a[i][j]=='W')
{
if(a[i][j-1]=='A'||a[i+1][j]=='A'||a[i][j+1]=='A'||a[i-1][j]=='B')
{
flag=1;break;
}
}
else if(a[i][j]=='A')
{
if(a[i][j-1]=='W'||a[i][j+1]=='W'||a[i-1][j]=='W'||a[i-1][j]=='B')
{
flag=1;break;
}
}
else if(a[i][j]=='B')
{
if(a[i+1][j]=='A')
{
flag=1;break;
}
}
}
if(flag)
break;
}
if(flag)
cout<<"no\n";
else
cout<<"yes\n";
}
else
cout<<"no\n";
}
}