#include "stdio.h"#include "string.h" int main(){ char str[30] = "acegfddcbag"; char *p, *q, *r, c; for(p=str; *p; p++){  for(q=r=p; *q; q++)   if(*r > *q) r = q;  if(r != q){   c = *r; *r = *p; *p = c;  } } for (p=str; *p; p++){  for(q=p; *p==*q; q++)   ;  strcpy(p+1, q); } printf("%s", str);  return 0;}

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