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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int state = 0;
  5.     char c;
  6.     while((scanf("%c",&c) == 1) && (c == 'a' || c == 'b')) {
  7.         switch (state) {
  8.             case 0:
  9.                 if (c == 'a') state = 1;
  10.                 break;
  11.             case 1:
  12.                 if (c == 'b') state = 2;
  13.                 break;
  14.             case 2:
  15.                 if (c == 'b') state = 3;
  16.                 else state = 1;
  17.                 break;
  18.             case 3:
  19.                 if (c == 'b') state = 0;
  20.                 else {
  21.                     puts("abba!!!");
  22.                     return 0;
  23.                     };
  24.                 break;
  25.             }
  26.         }
  27.     puts(" No abba :(");
  28.     }
  29.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
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abbbaaaabbabbbbaaa
stdout
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abba!!!
https://ideone.com/XcPYKx
language:
C (gcc 8.3)
created:
5 years ago
visibility:
secret

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