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:46:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < table[h % M].size(); j++){ ^ user.cpp:53:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = len; i < text.length(); i++){ ^ user.cpp:54:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < table[h % M].size(); j++){ ^ user.cpp:45:49: warning: ‘len’ may be used uninitialized in this function [-Wmaybe-uninitialized] long long h = hashString(text.substr(0, len)); ^