Compilare: user.cpp: In function ‘void mk_suffix_array(int, int, std::vector<std::vector<std::array<int, 9u> > >&)’: user.cpp:43:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1, val = 0; i < sa.size(); ++i){ ^ user.cpp: In function ‘bool nr_good(int, int, const std::vector<std::vector<std::array<int, 9u> > >&, int, int)’: user.cpp:72:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1, val = 1; i < sa.size(); ++i){ ^ user.cpp:71:9: warning: unused variable ‘rez’ [-Wunused-variable] int rez = 1; ^