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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. int myStrlen(char s[]){
  6. 	int i;
  7. 	for(i=0;s[i]!='\0';i++);
  8. 	return i;
  9. }
  10.  
  11. char *setPalindrome(char s[]){
  12. 	int len = myStrlen(s);
  13. 	if (len == 0) {
  14. 		char *tmp = (char*)malloc(1);
  15. 		if (tmp) tmp[0] = '\0';
  16. 		return tmp;
  17. 	}
  18.  
  19. 	int i, j;
  20. 	int suffix_palindrome_start_index = 0;
  21. 	for (i = 0; i < len; i++) {
  22. 		int is_palindrome = 1;
  23. 		for (j = 0; j < (len - i) / 2; j++) {
  24. 			if (s[i + j] != s[len - 1 - j]) {
  25. 				is_palindrome = 0;
  26. 				break;
  27. 			}
  28. 		}
  29.  
  30. 		if (is_palindrome) {
  31. 			suffix_palindrome_start_index = i;
  32. 			break;
  33. 		}
  34. 	}
  35.  
  36. 	int chars_to_add = suffix_palindrome_start_index;
  37. 	char *result = (char*)malloc(len + chars_to_add + 1);
  38. 	if (result == NULL) {
  39. 		return NULL;
  40. 	}
  41.  
  42. 	strcpy(result, s);
  43.  
  44. 	int current_result_len = len;
  45. 	for (i = 0; i < chars_to_add; i++) {
  46. 		char char_to_append = s[chars_to_add - 1 - i];
  47. 		result[current_result_len + i] = char_to_append;
  48. 	}
  49.  
  50. 	result[len + chars_to_add] = '\0';
  51. 	return result;
  52. }
  53.  
  54. int main(){
  55. 	int i;
  56.  
  57. 	char nyuryoku[1024];
  58. 	char *kaibun;
  59. 	scanf("%s", nyuryoku);
  60. 	kaibun = setPalindrome(nyuryoku);
  61. 	printf("%s -> %s\n", nyuryoku, kaibun);
  62. 	free(kaibun);
  63. 	return 0;
  64. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
abab
stdout 
abab -> ababa
https://ideone.com/LEsx4A
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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