Compilare: 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); ^ 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 function ‘int main()’: user.cpp:103:28: warning: ‘ans_col’ may be used uninitialized in this function [-Wmaybe-uninitialized] recon(ans_lin, ans_col); ^ user.cpp:103:28: warning: ‘ans_lin’ may be used uninitialized in this function [-Wmaybe-uninitialized]