Compilare: user.cpp: In function ‘int* precalc(const string&)’: user.cpp:14:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1,len=0;i<pat.size();) ^ user.cpp: In function ‘std::vector<int> kmp(const string&, const string&)’: user.cpp:43:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<txt.size();) ^ user.cpp:50:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==pat.size()) ^ user.cpp:67:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==pat.size()) ^ user.cpp: In function ‘int main()’: user.cpp:79:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<1000 && i<sol.size();i++) ^