fork download
copy 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define IO ios_base::sync_with_stdio(0), cin.tie(0),cout.tie(0)
  4. typedef long long ll;
  5. const int N = 1e5 + 4 , MOD = 1e9 + 7 ;
  6. string s ;
  7. bool ok ;
  8. bool solve(int idx)
  9. {
  10.     if(idx == s.size()+1)
  11.         return (ok == 1) ;
  12.     if(idx % 2 == 0 && islower(s[idx]) || idx % 2 == 1 && isupper(s[idx]))
  13.         ok = 0 ;
  14.     solve(idx + 1) ;
  15.     return (ok == 1 ) ;
  16. }
  17. int main() {
  18.     IO ;
  19.     cin>>s ;
  20.     ok = 1 ;
  21.     s = '*' + s ;
  22.     if(solve(1) == 1)
  23.         cout<<"Yes" ;
  24.     else
  25.         cout<<"No" ;
  26.     return 0;
  27. }
Success #stdin #stdout 0.01s 5528KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Yes
https://ideone.com/OjQeeM
language:
C++14 (gcc 8.3)
created:
311 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!