Compilare: main.cpp: In function 'void KMP(std::__cxx11::string, std::__cxx11::string, int)': main.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < a.size(); ++i){ ~~^~~~~~~~~~ main.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < b.size(); ++i){ ~~^~~~~~~~~~ main.cpp:32:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == a.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main(int, const char**)': main.cpp:66:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); ++i) ~~^~~~~~~~~~