Compilare: user.cpp: In function ‘int main()’: user.cpp:299:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); ++ i) ^ user.cpp:300:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << sol[i] << " \n"[i + 1 == sol.size()]; ^ user.cpp: In function ‘void bringToCol(int, int, int)’: user.cpp:149:15: warning: ‘col’ may be used uninitialized in this function [-Wmaybe-uninitialized] -- col; ^ user.cpp:168:9: warning: ‘lin’ may be used uninitialized in this function [-Wmaybe-uninitialized] while (lin0 < lin) ^