import math,sys;input=sys.stdin.readline;S=lambda:input().rstrip();I=lambda:int(S());M=lambda:map(int,S().split());L=lambda:list(M());mod1=1000000007;mod2=998244353
for _ in range(I()):
n=I();s=S();f=0
if n==1:
if s[0]=='W':print("YES")
else:print("NO")
continue
l=list(s.split('W'))
for i in l:
if len(i)>0 and (i=='R'*len(i) or i=='B'*len(i)):f=1;break
print("NO" if f else "YES")// Online C++ compiler to run C++ program online
#include <bits/stdc++.h>
using namespace std;
int main() {
int t;cin>>t;
while(t--){
int n;cin>>n;
string s;cin>>s;
int c=0,r=0,b=0;
string a;
for(int i=0;i<n;i++){
if(s[i]=='W'){
if(r==0 && b==0 || r>0 && b>0)r=0,b=0,c=0;
else{
a="N";
cout<<"No"<<endl;
break;
}
}
if(s[i]=='R')r++;
if(s[i]=='B')b++;
c++;
}
if(a!="N"){
if(r>0 && b>0 || r==0 && b==0)
cout<<"Yes"<<endl;
else cout<<"No"<<endl;
}
}
return 0;
}439A - Devu the Singer and Churu the Joker | 1323A - Even Subset Sum Problem |
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577A - Multiplication Table | 817C - Really Big Numbers |
1355A - Sequence with Digits | 977B - Two-gram |
993A - Two Squares | 1659D - Reverse Sort Sum |