Python在求大神救救孩子

Question

 

Answer 1

s=input()
flag=0
t1=0
t2=0
for i in range(len(s)):
    if s[i]=='L':
        t1=t1+1
        t2=0
        if(t1>1):
            flag=1
            break
    elif s[i]=='D':
        t2=t2+1
        if (t2 == 3):
            flag = 1
            break
    else:
        t2=0
if(flag==1):
    print("No")
else:
    print("YES")