Compilare: main.cpp: In function 'int main()': main.cpp:130:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("dragonball.in","r",stdin); ^ main.cpp:131:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("dragonball.out","w",stdout); ^ main.cpp: In function 'std::istream& operator>>(std::istream&, HugeNumber&)': main.cpp:105:13: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized] int p; ^