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  1. #include<iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  6.  
  7.     string s;
  8.     cin >> s; 
  9.     bool flag = true; 
  10.     for (int i = 0; i < s.size(); i++) {
  11.         if (i % 2 == 0) { 
  12.             if (s[i] != 'D' && s[i] != 'U' && s[i] != 'L') {
  13.                 flag = false;
  14.                 break;
  15.             }
  16.         } else {
  17.             if (s[i] != 'D' && s[i] != 'U' && s[i] != 'R') {
  18.                 flag = false;
  19.                 break;
  20.             }
  21.         }
  22.     }
  23.  
  24.     if (flag) {
  25.         cout << "Yes" << "\n";
  26.     } else {
  27.         cout << "No" << "\n";
  28.     }
  29.  
  30.     return 0;
  31. }
  32.  
  33.  
  34.  
Success #stdin #stdout 0s 5272KB
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stdin
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Standard input is empty
stdout
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Yes
https://ideone.com/ljIBVS
language:
C++ (gcc 8.3)
created:
86 days ago
visibility:
public

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