Compilare: main.cpp: In function 'void KMP(std::__cxx11::string, std::__cxx11::string)': main.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < a.size(); ++i) ~~^~~~~~~~~~ main.cpp:28:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < b.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); ++i) ~~^~~~~~~~~~