Compilare: user.cpp: In function ‘ull get_number(unsigned int, ull, ull)’: user.cpp:23:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int new_row = row > (1 << (n-1)) ? row - (1 << (n-1)) : row; ^ user.cpp:24:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int new_col = col > (1 << (n-1)) ? col - (1 << (n-1)) : col; ^