Eroare de compilare: user.cpp: In function ‘bool exista(unsigned int)’: user.cpp:13:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (H[i][j] == x) ^ user.cpp: In function ‘int main()’: user.cpp:33:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[i].size();++i) ^ user.cpp:34:15: error: cannot bind ‘std::basic_ostream<char>’ lvalue to ‘std::basic_ostream<char>&&’ g<<H[i]<<" "; ^ In file included from /usr/include/c++/4.8/istream:39:0, from /usr/include/c++/4.8/sstream:38, from /usr/include/c++/4.8/complex:45, from /usr/include/c++/4.8/ccomplex:38, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/4.8/ostream:602:5: error: initializing argument 1 of ‘std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = std::vector<int>]’ operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x) ^