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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int check = 0;
  5. void find_magic (string s)
  6. {
  7.     int len = s.length();
  8.     string S1="", S2="", S3="";
  9.     if (len >= 1) S1 = S1 + s[0];
  10.     if (len >= 2) S2 = S2 + s[0] + s[1];
  11.     if (len >= 3) S3 = S3 + s[0] + s[1] + s[2];
  12.     if (S1 == "1" && s.length()>=1)
  13.     {
  14.         if (len == 1)
  15.         {
  16.             check = 1;
  17.             return;
  18.         }
  19.         else find_magic (s.substr(1, s.length()-1));
  20.     }
  21.     if (S2 == "14" && len>=2)
  22.     {
  23.         if (len == 2)
  24.         {
  25.             check = 1;
  26.             return;
  27.         }
  28.         else find_magic (s.substr(2, s.length()-2));
  29.     }
  30.     if (S3 == "144" && len>=3)
  31.     {
  32.         if (len == 3)
  33.         {
  34.             check = 1;
  35.             return;
  36.         }
  37.         else find_magic (s.substr(3, s.length()-3));
  38.     }
  39.     return;
  40. }
  41.  
  42. int main ()
  43. {
  44.     string s;
  45.     cin>>s;
  46.     find_magic (s);
  47.     if (check == 1) cout<<"YES";
  48.     else cout<<"NO";
  49.     return 0;
  50. }
Success #stdin #stdout 0s 4360KB
comments (?)
stdin
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114144
stdout
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YES
https://ideone.com/jQgbvM
v- P151PROH - ROUND 1H - Số ma thuật
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
secret

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