Compilare: user.cpp: In member function ‘void InputReader::adv()’: user.cpp:49:50: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, sizeof(char), BUFF_SIZE, fin); ^ user.cpp: In function ‘int main()’: user.cpp:99:56: warning: ‘c2’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << l1 << " " << c1 << " " << l2 << " " << c2; ^ user.cpp:99:41: warning: ‘l2’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << l1 << " " << c1 << " " << l2 << " " << c2; ^ user.cpp:99:28: warning: ‘c1’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << l1 << " " << c1 << " " << l2 << " " << c2; ^ user.cpp:99:15: warning: ‘l1’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << l1 << " " << c1 << " " << l2 << " " << c2; ^