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B.cpp
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B.cpp
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#include<bits/stdc++.h>
using namespace std;
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL)
int main()
{
fastio;
int t,n,m,i,j,up[50],left[50],p,r,mu,ml;
char ara[20][20];
cin>>t;
while(t--)
{
cin>>n>>m;
r=0;
p=0;
for(i=0;i<n;i++)
{
for(j=0;j<m;j++)
{
cin>>ara[i][j];
if(ara[i][j]=='R')
{
up[r]=i;
left[r]=j;
r++;
}
}
}
for(i=0;i<r;i++)
{
p=0;
for(j=0;j<r;j++)
{
if(up[j]<up[i] || left[j]<left[i])
{
p=1;
break;
}
}
if(p==0)
break;
}
if(p==0)
cout<<"YES"<<"\n";
else
cout<<"NO"<<"\n";
}
return 0;
}