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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int myStrlen(char s[]){
  5.     int i;
  6.     for(i=0;s[i]!='\0';i++);
  7.     return i;
  8. }
  9.  
  10. int isPalindrome(char s[]){
  11.     int i=0, j,a;
  12.     for(j=0;s[j+1]!='\0';j++);
  13.     for(i=0; i<=j; i++){
  14.         if(s[i]!=s[j] && s[i]!='?'){
  15.         a=0;
  16.         break;
  17.         }
  18.         a=1;
  19.         j--;
  20.     }
  21.     return a;
  22. }
  23.  
  24. // 関数の中でtmpに対してmallocして
  25. // そこに回文を代入してreturnで返しましょう
  26. char *setPalindrome(char s[]){
  27. 	char *tmp;
  28. 	//以下に必要な宣言を含めて書いてください
  29. 	int i,j,num;
  30. 	num = myStrlen(s);
  31. 	tmp = (char *)malloc(sizeof(char)*(2*num+1));
  32. 	if(tmp == NULL){
  33.         printf("error\n");
  34.         return NULL;
  35.     }
  36.  
  37. 	for(i=0; i<num; i++){
  38. 		tmp[i] = s[i];
  39. 	}
  40.  
  41. 	tmp[num] = '\0';
  42. 	int judg = isPalindrome(tmp);
  43. 	while(1){
  44. 		if(judg==0){
  45. 			i++;
  46. 			tmp[i] = '?';
  47. 			tmp[i+1] = '\0';
  48. 			judg = isPalindrome(tmp);
  49. 		}
  50. 		else{
  51. 			break;
  52. 		}
  53. 	}
  54.  
  55. 	for(j=0; j<=i; j++){
  56. 		if(tmp[i]=='?'){
  57. 			tmp[i--] = tmp[j];
  58. 		}
  59. 	}
  60.  
  61. 	return tmp;
  62. }
  63.  
  64.  
  65. //メイン関数はいじる必要はありません
  66. int main(){
  67. 	int i;
  68.     char nyuryoku[1024]; //入力
  69.     char *kaibun;   //回文を受け取る
  70.     scanf("%s",nyuryoku);
  71.     kaibun = setPalindrome(nyuryoku);
  72.     printf("%s\n  -> %s\n",nyuryoku,kaibun);
  73.     free(kaibun);
  74.     return 0;
  75. }
  76.  
Runtime error #stdin #stdout 0.04s 5224KB
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abcd
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Standard output is empty
https://ideone.com/JUOY3I
language:
C (gcc 8.3)
created:
13 days ago
visibility:
public

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