In this HackerRank Sorting Array of Strings problem in C programming problem we have given an array of strings, you need to implement a string_sort function which sorts the strings according to a comparison function.

## HackerRank Sorting Array of Strings in c problem solution

``` int lexicographic_sort(const char* a, const char* b){
return strcmp(a, b) > 0;
}

int lexicographic_sort_reverse(const char* a, const char* b){
return strcmp(a, b) <= 0;
}

int sort_by_number_of_distinct_characters(const char* a, const char* b){
int c1 = 0, c2 = 0;
int hsh1[26] = {0}, hsh2[26] = {0};
int n1 = strlen(a);
int n2 = strlen(b);

for(int i = 0; i < n1; i++){
hsh1[a[i] - 'a'] = 1;
}

for(int i = 0; i < n2; i++){
hsh2[b[i] - 'a'] = 1;
}

for(int i = 0; i < 26; i++){
if(hsh1[i])
c1++;
if(hsh2[i])
c2++;
}
if( c1 != c2)
return c1 > c2;
else
return strcmp(a, b)  > 0;

}

int sort_by_length(const char* a, const char* b){
if(strlen(a) != strlen(b))
return strlen(a) > strlen(b);
else
return strcmp(a, b) >  0;
}

void string_sort(char** arr,const int len,int (*cmp_func)(const char* a, const char* b)){
for(int i = 1; i < len; i++){
int j = i;
char* p = arr[i];
while(j > 0){
if((*cmp_func)(arr[j-1],p) > 0 )
arr[j] = arr[j-1];
else
break;
j--;
}
arr[j] = p;
}
}
```