Compilare: user.cpp: In function ‘void Update(int, int, int)’: user.cpp:72:11: warning: statement has no effect [-Wunused-value] for (x; x <= n; x += (x & -x)) ^ user.cpp: In function ‘int Query(int)’: user.cpp:78:11: warning: statement has no effect [-Wunused-value] for (x; x; x -= (x & -x)) ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:36:51: 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); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:14:47: 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); ^