Eroare de compilare: main.cpp: In function 'int main()': main.cpp:19:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < sir.size()) ~~^~~~~~~~~~~~ main.cpp:24:25: error: request for member 'push_back' in 'a.std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator[]<char, std::char_traits<char>, std::allocator<char> >(((std::__cxx11::basic_string<char>::size_type)vf))', which is of non-class type '__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type {aka char}' a[vf].push_back(sir[i++]); ^~~~~~~~~ main.cpp:33:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < sir.size() && (isalpha(sir[i]) || isalnum(sir[i]))) ~~^~~~~~~~~~~~ main.cpp:34:23: error: request for member 'push_back' in 'a.std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator[]<char, std::char_traits<char>, std::allocator<char> >(((std::__cxx11::basic_string<char>::size_type)vf))', which is of non-class type '__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type {aka char}' a[vf].push_back(sir[i++]); ^~~~~~~~~ main.cpp:51:18: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type {aka char}[int]' for array subscript if(a[i][0] >= 'a' && a[i][0] <= 'z') ^ main.cpp:51:36: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type {aka char}[int]' for array subscript if(a[i][0] >= 'a' && a[i][0] <= 'z') ^ Non zero exit status: 1