Compilare: user.cpp: In function ‘void bpi(std::string, std::string)’: user.cpp:24:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<pat.size();++i) ^ user.cpp: In function ‘std::vector<int> KMP(std::string, std::string)’: user.cpp:38:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<str.size();++i) ^ user.cpp:42:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k==pat.size()) ans.push_back(i-pat.size()+1); ^ user.cpp: In function ‘int main()’: user.cpp:62:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<posf.size();++i) ^ user.cpp:69:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<poss.size()) ^ user.cpp:71:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j<posf.size() && posf[j] < poss[i]) ++j; ^