Compilare: main.cpp: In function 'void precompute()': main.cpp:20:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i=2;i<pat.size();i++) | ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for(int i=1;i<s.size();i++){ | ~^~~~~~~~~ main.cpp:51:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | if(l==pat.size()-1){ | ~^~~~~~~~~~~~~~