Compilare: user.cpp: In function ‘int main()’: user.cpp:23:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minlcm.in","r",stdin); ^ user.cpp:24:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minlcm.out","w",stdout); ^ user.cpp:30:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&test); ^ user.cpp:32:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:33:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i=1; i<=n; ++i) {scanf("%d",&a[i]);} ^ user.cpp:15:28: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (!a || !b) return a+b; ^ user.cpp:46:12: note: ‘x2’ was declared here int x1,x2; ^ user.cpp:15:28: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (!a || !b) return a+b; ^ user.cpp:46:9: note: ‘x1’ was declared here int x1,x2; ^