Compilare: main.cpp: In function 'void precalc(const std::string&)': main.cpp:13:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | while(i<s.size()) | ~^~~~~~~~~ main.cpp: In function 'void kmp(const std::string&, const std::string&)': main.cpp:38:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | while(i<b.size()) | ~^~~~~~~~~ main.cpp:56:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | if(j==a.size()) | ~^~~~~~~~~~