Compilare: user.cpp: In function ‘bool good(int)’: user.cpp:17:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<input.size();j++) { ^ user.cpp: In function ‘void query()’: user.cpp:29:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<names.size();i++) { ^ user.cpp:41:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<possible.size();i++) { ^ user.cpp:43:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (mlen > possible[i].first.size()) { ^ user.cpp: In function ‘void update(int)’: user.cpp:55:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<names.size();i++) { ^ user.cpp: In function ‘void solve()’: user.cpp:69:14: warning: statement has no effect [-Wunused-value] input; f>>input; ^