题解 | #提取不重复的整数#

#include <stdio.h>
#include <string.h>

#define max 1000

//2021/7/3-16:07
//2021/7/3-16:21

/*
输入：9876673
输出：37689
*/

int main()
{
   char s[max];
   char a[32];
   char v[32];
   int i, j;

   gets(s);

   memset(a, 0, 32);

   for (i = strlen(s) - 1, j = 0; i >= 0; i--)
   {
      if (a[s[i] - '0'] == 0)
      {
         v[j++] = s[i];
         a[s[i] - '0'] = 1;
      }
   }

   v[j] = 0;

   puts(v);

   return 0;
}