Compilare: user.cpp: In function ‘std::pair<int, int> query(std::pair<int, int>)’: user.cpp:46:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ht[key].size(); ++i) ^ user.cpp: In function ‘unsigned int getInt()’: user.cpp:22:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^ user.cpp:26:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^