Compilare: user.c: In function ‘perim2’: user.c:35:7: warning: variable ‘rez’ set but not used [-Wunused-but-set-variable] int rez; ^ user.c: At top level: user.c:54:11: warning: return type of ‘main’ is not ‘int’ [-Wmain] long long main(){ ^ user.c: In function ‘main’: user.c:59:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%lld%lld%lld", &dr[i].x1, &dr[i].y1, &dr[i].x2, &dr[i].y2); ^