Compilare: user.cpp: In function ‘void KMP(std::__cxx11::string, std::__cxx11::string)’: user.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < x.size(); ++i){ ~~^~~~~~~~~~ user.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < y.size(); ++i){ ~~^~~~~~~~~~ user.cpp:31:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == x.size() - 1){ ~~^~~~~~~~~~~~~~~ user.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); ++i){ ~~^~~~~~~~~~