Compilare: user.c: In function ‘find’: user.c:29:37: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] struct hash_line *New = (struct hash_line*) malloc(sizeof(struct hash_line)); ^ user.c:29:49: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] struct hash_line *New = (struct hash_line*) malloc(sizeof(struct hash_line)); ^ user.c: In function ‘main’: user.c:40:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("loto.out", "w", stdout); ^ user.c:46:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &S); ^ user.c:49:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &A[i]); ^