Compilare: user.cpp: In function ‘void bpi(std::string)’: user.cpp:19:25: 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:33:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<str.size();++i) ^ user.cpp:37:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k==pat.size()) ans.push_back(i-pat.size()+1); ^