Compilare: user.cpp: In function ‘int main()’: user.cpp:24: warning: cannot pass objects of non-POD type ‘class std::bitset<1000005u>::reference’ through ‘...’; call will abort at runtime user.cpp:9: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:13: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result