1.3 KB | 1314 chars
"""
[22686: Dance Dance Revolution](https://www.acmicpc.net/problem/22686)
Tier: Bronze 1
Category: implementation, string
"""
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
SYS_INPUT = True
RECURSION_LIMIT = 10 ** 7
SET_RECURSION = False
BLANK = " "
if SET_RECURSION:
sys.setrecursionlimit(RECURSION_LIMIT)
inp = lambda : sys.stdin.readline().rstrip() if SYS_INPUT else input()
mii = lambda : [*map(int,inp().split())]
mfi = lambda : [*map(float,inp().split())]
ii = lambda : int(inp())
fi = lambda : float(inp())
isplit = lambda : inp().split()
p = print
def gcd(a, b): return gcd(b, a % b) if b > 0 else a
def lcm(a, b): return a * b // gcd(a, b)
def solve():
s = inp()
n = len(s)
directions = [-1] * n
for i in range(n):
if s[i] == 'L':
directions[i] = 0
elif s[i] == 'R':
directions[i] = 1
for i in range(n - 1):
if s[i] == s[i + 1]:
return "No"
st = -1
for i in range(n):
if directions[i] >= 0:
st = i
break
crt = 1 - directions[st]
for i in range(st + 1, n):
if directions[i] >= 0:
if crt != directions[i]:
return "No"
crt = 1 - crt
return "Yes"
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
ret = solve()
p(ret)