Compilare: main.cpp: In function 'int main()': main.cpp:53:34: warning: narrowing conversion of 'S.std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length<char, std::char_traits<char>, std::allocator<char> >()' from 'std::__cxx11::basic_string<char>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] V.push_back({S.length(), i, S}); ~~~~~~~~^~ main.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V.size(); ++i) { ~~^~~~~~~~~~