Compilare: user.cpp: In function ‘long long int hashString(const string&)’: user.cpp:18:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < str.length(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:40:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < table[h % M].size(); j++){ ^ user.cpp:46:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = len; i < text.length(); i++){ ^ user.cpp:48:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < table[h % M].size(); j++){ ^ user.cpp:47:59: warning: ‘len’ may be used uninitialized in this function [-Wmaybe-uninitialized] h = (h - code(text[i - len])) / 3 + pow(3, len - 1) * code(text[i]); ^