Compilare: user.cpp: In function ‘int main()’: user.cpp:27:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int p = 0; p < s[i].size(); p ++ ) ^ user.cpp:29:29: warning: narrowing conversion of ‘(((((std::basic_string<char>::size_type)p) - s[i].std::basic_string<_CharT, _Traits, _Alloc>::size<char, std::char_traits<char>, std::allocator<char> >()) + ((std::basic_string<char>::size_type)p)) + 1u)’ from ‘std::basic_string<char>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] q.push( { p - ( s[i].size() - p - 1 ), s[i].size() } ); ^ user.cpp:29:66: warning: narrowing conversion of ‘s[i].std::basic_string<_CharT, _Traits, _Alloc>::size<char, std::char_traits<char>, std::allocator<char> >()’ from ‘std::basic_string<char>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] q.push( { p - ( s[i].size() - p - 1 ), s[i].size() } ); ^