Compilare: user.cpp: In constructor ‘AIB::AIB(std::vector<int>)’: user.cpp:48:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int idx = 0; idx < list.size(); idx++) ^ user.cpp:53:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int idx = 1; idx < m_array.size(); idx++) ^ user.cpp:56:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (idx2 < m_array.size()) ^ user.cpp: In member function ‘void AIB::update(int, int)’: user.cpp:80:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (++idx; idx < m_array.size(); idx += idx & -idx) ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:11:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:33:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^