Compilare: user.cpp: In function ‘int main()’: user.cpp:77:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int state = 0; state < states[len].size(); state++) ^ user.cpp:88:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < nxt.size(); k++) ^ user.cpp:89:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int h = 0; h < nxt[k].size(); h++) ^