jakaria_hossain

codeforce - magic numbers

Apr 10th, 2019
68
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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5. int i,len;
  6. string s;
  7. getline(cin,s);
  8. len=s.size();
  9. for(i=0;i<len;i++)
  10. {
  11. if(s[0]!='1')break;
  12. if(s[i]=='1')continue;
  13. if(s[i]=='4')
  14. {
  15. if(s[i+1]=='4' && s[i+2]=='4')break;
  16. }
  17. else break;
  18. }
  19. if(i<len)printf("NO\n");
  20. else printf("YES\n");
  21. return 0;
  22. }
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