Eroare de compilare: user.c:4:1: error: unknown type name ‘bool’ bool flag; ^ user.c: In function ‘main’: user.c:15:9: error: ‘true’ undeclared (first use in this function) flag = true; ^ user.c:15:9: note: each undeclared identifier is reported only once for each function it appears in user.c:20:11: error: ‘false’ undeclared (first use in this function) flag = false; ^ user.c:8:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("perechi.in", "r", stdin); ^ user.c:9:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("perechi.out", "w", stdout); ^ user.c:11:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &n); ^