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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. #define CLOSE_PROGRAM fclose(input); fclose(output); return 0;
  6.  
  7. int main(void)	{
  8. 	FILE *input = fopen("pal.in","r"), *output = fopen("pal.out","w");
  9. 	char *array;
  10. 	long int i,j,mid,len;
  11. 	fscanf(input,"%ld",&len);
  12. 	array = (char *) malloc(len);
  13. 	fscanf(input,"%s",array);
  14. 	if(len % 2)	{					//Βρίσκω το μέσο
  15. 		mid  = len / 2 + 1;			//
  16. 	}else	{						//
  17. 		mid = len / 2;				//
  18. 	}
  19. 	i = mid - 1;
  20. 	j = mid + 1;
  21. 	while(array[i] == array[j])	{	//Βρίσκω το μέχρι πού είναι ίδια τα indexes
  22. 		i--;						//
  23. 		j++;						//
  24. 	}
  25. 	if(i == 0 && j == len)	{ 		//Είναι παλίνδρομο!
  26. 		fprintf(input,"%ld",len);
  27. 		CLOSE_PROGRAM
  28. 	}
  29. 	array = (char *) realloc(array,len + (len - 1));
  30. 	for(mid = len - 1, i = mid - 1, j = mid + 1; i >= 0; i--, j++)	{
  31. 		array[j] = array[i];
  32. 	}
  33. 	fprintf(output,"%s",array);
  34. 	CLOSE_PROGRAM
  35. }
  36.  
Not running #stdin #stdout 0s 0KB
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stdout 
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https://ideone.com/doXzh
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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