Compilare: user.c: In function ‘lgput’: user.c:22:20: warning: operation on ‘l’ may be undefined [-Wsequence-point] return ((l = lgput(n, p >> 1)) * l) % mod; ^ user.c: In function ‘main’: user.c:29:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN, "r", stdin); ^ user.c:30:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT, "w", stdout); ^ user.c:32:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lu %lu", &n, &p); ^