Compilare: user.cpp: In function ‘int main()’: user.cpp:61:11: warning: unused variable ‘it’ [-Wunused-variable] for(auto &it:ve) ^ user.cpp:63:11: warning: unused variable ‘it’ [-Wunused-variable] for(auto &it:ho) ^ user.cpp:29:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("coliziuni.in","r",stdin); ^ user.cpp:30:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("coliziuni.out","w",stdout); ^