Compilare: main.cpp: In member function 'void AhoCorasick::insert(std::string&)': main.cpp:40:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:108:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 108 | for(int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:106:9: warning: unused variable 'ans' [-Wunused-variable] 106 | int ans = 0; | ^~~