Compilare: user.cpp: In function ‘void dump(std::deque<int, std::allocator<int> >)’: user.cpp:11: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dump(std::deque<char, std::allocator<char> >)’: user.cpp:18: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:97: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:98: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:99: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result