Compilare: user.cpp: In function ‘void init_tables()’: user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void print_tables()’: user.cpp:41: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void print_list(std::vector<int, std::allocator<int> >*)’: user.cpp:53: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:109: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:110: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:113: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:116: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘ht_pointer find(int)’: user.cpp:79: warning: ‘htp.ht_pointer::list’ may be used uninitialized in this function user.cpp: In function ‘void print_tables()’: user.cpp:37: warning: ‘i’ is used uninitialized in this function