Eroare de compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:10:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[nod].size(); i++) if (!viz[v[nod][i]]) dfs(v[nod][i]); ^ user.cpp: In function ‘int main()’: user.cpp:13:5: error: reference to ‘cin’ is ambiguous cin >> n; ^ user.cpp:3:10: note: candidates are: std::ifstream cin ifstream cin("dfs.in"); ^ In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:74:0, from user.cpp:1: /usr/include/c++/4.8/iostream:60:18: note: std::istream std::cin extern istream cin; /// Linked to standard input ^ user.cpp:14:5: error: reference to ‘cin’ is ambiguous cin >> m; ^ user.cpp:3:10: note: candidates are: std::ifstream cin ifstream cin("dfs.in"); ^ In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:74:0, from user.cpp:1: /usr/include/c++/4.8/iostream:60:18: note: std::istream std::cin extern istream cin; /// Linked to standard input ^ user.cpp:17:9: error: reference to ‘cin’ is ambiguous cin >> a; ^ user.cpp:3:10: note: candidates are: std::ifstream cin ifstream cin("dfs.in"); ^ In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:74:0, from user.cpp:1: /usr/include/c++/4.8/iostream:60:18: note: std::istream std::cin extern istream cin; /// Linked to standard input ^ user.cpp:18:9: error: reference to ‘cin’ is ambiguous cin >> b; ^ user.cpp:3:10: note: candidates are: std::ifstream cin ifstream cin("dfs.in"); ^ In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:74:0, from user.cpp:1: /usr/include/c++/4.8/iostream:60:18: note: std::istream std::cin extern istream cin; /// Linked to standard input ^ user.cpp:28:5: error: reference to ‘cout’ is ambiguous