Compilare: user.cpp: In function ‘std::pair<int, int> dp(int, int, bool, const string&)’: user.cpp:10:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos == s.size()) { ^ user.cpp:14:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ok && pos > s.size() - bit - 1) ^ user.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos == s.size() - bit - 1 and i != 1) ^