Compilare: main.cpp: In function 'void makeprefix()': main.cpp:12:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int i=1; i<pat.size(); ++i) | ~^~~~~~~~~~~ main.cpp: In function 'void KMP()': main.cpp:22:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int i=1; i<s.size(); ++i) | ~^~~~~~~~~ main.cpp:26:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | if(k==pat.size()-1) v.push_back(i-pat.size()+1) ; | ~^~~~~~~~~~~~~~