?

int ?sprime()
 {
???? int ?i,?j;
???? int ?b_size;
???? int ?MAXN? = ? 40000 ;
???? for ?(i = 2 ;?i < MAXN;?i ++ )?prime[i]? = ? 1 ;
???? for ?(i = 2 ;?i < MAXN;?i ++ )
???? {
???????? if ?(prime[i]? == ? 1 )
???????????? for ?(j = 2 ;?i * j < MAXN;?j ++ )
????????????????prime[i * j]? = ? 0 ;
????}
???? for (i? = ? 0 ,?j? = ? 0 ;?j? < ?MAXN;?j ++ )
???? {
???????? if (prime[j]? == ? 1 ) {
????????????b[i]? = ?j;
????????????i ++ ;
????????}
????}
????b_size? = ?i;
???? return ?b_size;
}