Compilare: main.cpp: In function 'void add()': main.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int i = 0; i < ans.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | while(pos < s.size() - 1) { | ~~~~^~~~~~~~~~~~~~ main.cpp:66:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for(int i = 1; i < ans.size(); i++) { | ~~^~~~~~~~~~~~