#include <stdio.h>
const int alph_length = 26;
int main() {
int i;
char text[81];
char *p;
int letters_encountered[alph_length];
for(i = 0;i< alph_length ; i++ )
letters_encountered[i]=0;
fgets(text,80,stdin);
p = text;
while(*p!=0) {
if(*p< 'a' || *p > 'z') {
p++;
continue;
};
letters_encountered[*(p++) -'a']++;
};
for(i=0;i<alph_length;i++) {
if(letters_encountered[i]==1)
printf("%c",'a'+(char)i);
};
return 0;
};
Следующий вариант
#include<stdio.h>
int Comp(const void* a, const void* b){
return *(char*)a-*(char*)b;
}
int main(){
char text[]="fghbnggnawqxw", *p=text;
qsort(text, sizeof(text)-1, sizeof(*text), Comp);
for(; *p; ++p){
if(*p==*(p+1)){
while(*p==*(p+1))++p;
}
else{
printf("%c", *p);
}
}
return 0;
}
Следующий вариант
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int Compare(const void* a, const void* b){
return *(char*)a-*(char*)b;
}
int main(){
char *matr[]={{"abcemn"},
{"fedkpo"},
{"ghijqr"},
{"xwvuts"},
{"yzaala"}}, res[100]={'\0'}, i, *a=res, *b=res;
for(i=0; i<sizeof(matr)/sizeof(*matr); i++){
strcat(res, matr[i]);
}
qsort(res, strlen(res), sizeof(*res), Compare);
for(; *b=*a; ++a){
if(*a!=*(a+1))++b;
}
puts(res);
return 0;
}
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