320A Magic Numbers

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  1. #include<iostream>
    2. 

  2. using namespace std;
    3. 

  3. int main(){
    4. 

  4.    string s;
    5. 

  5.    cin>>s;
    6. 

  6.    int ln=s.length();
    7. 

  7.    bool f=0;
    8. 

  8.    for(int i=0;i<ln;i++){
    9. 

  9.    if(s[i]=='4' and s[i+1]=='4' and s[i+2]=='4')
    10. 

  10.  {  f=1;
    11. 

  11.     }
    12. 

  12.     else  if(s[i]!='1' and s[i]!='4')
    13. 

  13.   { f=1;
    14. 

  14.   }
    15. 

  15.     else  if(s[0]=='4' )
    16. 

  16.   { f=1;
    17. 

  17.   }
    18. 

  18.    }
    19. 

  19.    if(f==1) cout<<"NO"<<endl;
    20. 

  20.    else cout<<"YES";
    21. 

  21.  
    22. 

  22.  
    23. 

  23. }
    24. 

  24.

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