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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. int main()
  5. {
  6. 	char a[256] =  { 0 };
  7. 	int b[256] = { 0 };
  8. 	int nab = 0, i, j;
  9. 	char s[51] = "";
  10.  
  11.     fflush(stdin);
  12.     gets(s);
  13.  
  14. 	for ( i = 0; i < strlen(s); i++)
  15. 	{
  16. 		int giatri = s[i];
  17.  
  18. 		int vitri = strchr(s, giatri) - s;
  19.  
  20. 		if ( vitri < 0)
  21.             continue;
  22.  
  23.         if ( vitri == i)
  24.              {
  25.                 a[nab] = giatri;
  26.                 b[nab] = 1;
  27.                 nab++;
  28.              }
  29.         else
  30.             b[vitri]++;
  31. 	}
  32.  
  33.     for ( i = 0; i < nab - 1; i++)
  34.         for ( j = i + 1 ; j < nab; j++)
  35.             if ( b[i] < b[j])
  36.             {
  37.                 int tam1 = b[i];
  38.                 b[i] = b[j];
  39.                 b[j] = tam1;
  40.  
  41.                 char tam2 = a[i];
  42.                 a[i] = a[j];
  43.                 a[j] = tam2;
  44.             }
  45.  
  46.     for ( i = 0; i < nab; i++)
  47.         printf("%c xuat hien %d lan \n", a[i], b[i]);
  48.  
  49.     return 0;
  50.  
  51. }
  52.  
  53.  
Success #stdin #stdout 0s 10320KB
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https://ideone.com/WXIgA7
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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