Compilare: main.cpp: In function 'void computePi(std::__cxx11::string)': main.cpp:20:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < x.size()) ~~^~~~~~~~~~ main.cpp: In function 'void KMP(std::__cxx11::string, std::__cxx11::string)': main.cpp:48:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < text.size()) ~~^~~~~~~~~~~~~ main.cpp:66:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(len == pat.size()) ~~~~^~~~~~~~~~~~~