Compilare: user.cpp: In function ‘int main()’: user.cpp:36:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < Used.size(); ++i ) ^ user.cpp:39:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < Hash[Used[i]].size(); ++j ) ^ user.cpp:48:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < Used2.size(); ++j ) ^