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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int myStrlen(char s[])
  5. {
  6.     int i;
  7.     for (i = 0; s[i] != '\0'; i++)
  8.         ;
  9.     return i;
  10. }
  11.  
  12. int check(char s[])
  13. {
  14.     int n = myStrlen(s);
  15.     int i = 0;
  16.     while (s[i] == s[n - i - 1])
  17.     {
  18.         if (i >= n / 2)
  19.             return 1;
  20.         i++;
  21.     }
  22.     return 0;
  23. }
  24.  
  25. char *setPalindrome(char s[])
  26. {
  27.     char *tmp;
  28.     int n = myStrlen(s), i;
  29.     tmp = (char *)malloc(sizeof(char) * (n * 2 + 1));
  30.  
  31.     for (i = 0; i < n; i++)
  32.     {
  33.         tmp[i] = s[i];
  34.     }
  35.     tmp[n] = '\0';
  36.  
  37.     if (check(tmp) == 1)
  38.         return tmp;
  39.  
  40.     for (i = 1; i < n; i++)
  41.     {
  42.         for (int k = 0; k < i; k++)
  43.         {
  44.             tmp[k + n] = s[i - k - 1];
  45.         }
  46.         tmp[i + n] = '\0';
  47.         if (check(tmp) == 1)
  48.         {
  49.             return tmp;
  50.         }
  51.     }
  52.  
  53.     return tmp;
  54. }
  55.  
  56. int main()
  57. {
  58.     int i;
  59.     char nyuryoku[1024];
  60.     char *kaibun;
  61.     scanf("%s", nyuryoku);
  62.     kaibun = setPalindrome(nyuryoku);
  63.     printf("%s\n  -> %s\n", nyuryoku, kaibun);
  64.     free(kaibun);
  65.     return 0;
  66. }
Success #stdin #stdout 0s 5288KB
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stdin
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kogakuin
stdout
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kogakuin
  -> kogakuiniukagok
https://ideone.com/mlJk8t
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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