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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void solve(int i, string &s) {
  5.   if (i == s.size()) {
  6.     cout << "Yes";
  7.     return;
  8.   }
  9.  
  10.   if ((i + 1) % 2 == 0) {
  11.     if (s[i] == tolower(s[i])) {
  12.       cout << "No";
  13.       return;
  14.     } else {
  15.       solve(i + 1, s);
  16.     }
  17.   } else {
  18.     if (s[i] == toupper(s[i])) {
  19.       cout << "No";
  20.       return;
  21.     } else {
  22.       solve(i + 1, s);
  23.     }
  24.   }
  25. }
  26.  
  27. int main() {
  28.   string s;
  29.   cin >> s;
  30.   if (s.size() == 1) {
  31.     if (s[0] == toupper(s[0])) {
  32.       cout << "No";
  33.     } else {
  34.       cout << "Yes";
  35.     }
  36.   } else {
  37.     solve(0, s);
  38.   }
  39.   return 0;
  40. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
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Standard input is empty
stdout
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Yes
https://ideone.com/uEjS3u
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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