Compilare: main.cpp: In function 'void radix_sort(int, std::__cxx11::string&)': main.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < cur_suf.size(); ++ i) ~~^~~~~~~~~~~~~~~~ main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < cur_suf.size(); ++ i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void suffix_array(std::__cxx11::string&, int)': main.cpp:83:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < cur_suf.size(); ++ i) ~~^~~~~~~~~~~~~~~~