Compilare: user.cpp: In function ‘void mul(long long unsigned int*, long long unsigned int)’: user.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=V[0];i++) ^ user.cpp: In function ‘int main()’: user.cpp:90:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=rez[0];i++) ^ user.cpp:63:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sumall.in","r",stdin); ^ user.cpp:64:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sumall.out","w",stdout); ^