Compilare: user.cpp: In constructor ‘fenwickTree::fenwickTree(int)’: user.cpp:72:8: warning: ‘fenwickTree::n’ will be initialized after [-Wreorder] int n; ^ user.cpp:71:16: warning: ‘std::vector<int> fenwickTree::tree’ [-Wreorder] vector<int> tree; ^ user.cpp:74:4: warning: when initialized here [-Wreorder] fenwickTree(int _n = 0) : n(_n), tree(vector<int>(_n + 1)) { ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:35:51: 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:13:47: 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); ^