Compilare: user.cpp: In function ‘int main()’: user.cpp:6:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vase.in","r",stdin); ^ user.cpp:7:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vase.out","w",stdout); ^ user.cpp:68:17: warning: ‘vd’ may be used uninitialized in this function [-Wmaybe-uninitialized] vd+=V[i]; ^ user.cpp:67:17: warning: ‘vs’ may be used uninitialized in this function [-Wmaybe-uninitialized] vs-=V[i]; ^