struct d_array {
    void *a;
    size_t e_siz, siz, max_siz;
    char *(*__tostr_el)(const void *);
    char *t__;
    char sep, pr_c, ps_c;
};
typedef struct d_array d_array;

char *d_array__tostr(d_array *da, size_t si, size_t ei);
d_array *d_array__new(size_t n, size_t e, char *(*__tef)(const void *), const char *__t,
		      char __sep, char __pr_c, char __ps_c);
void d_array__insert(d_array *da, void *e, size_t i);
void d_array__append(d_array *da, void *e);
void d_array__remove(d_array *da, size_t i);
void *d_array__get(d_array *da, size_t i);
void d_array__getcpy(void *p, d_array *da, size_t i);
void d_array__set(d_array *da, size_t i, void *p);
void d_array__free(d_array *da);

double normalcdf(double x, double mu, double s);
double normalpdf(double x, double mu, double s);

struct ht_node {
    char *str;
    struct ht_node *next;
};
typedef struct ht_node ht_node;

struct h_table {
    ht_node **table;
    int siz;
}
typedef struct h_table h_table;

h_table *new_h_table(int s);
int hfunc(char *s, int siz);
void h_table_insert(h_table *ht, char *s);
int h_table_nsearch(h_table *ht, char *s);
void free_h_table(h_table *ht);