Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:20:5: error: reference to ‘cin’ is ambiguous cin >> n >> m; ^~~ user.cpp:4:10: note: candidates are: std::ifstream cin ifstream cin("dfs.in"); ^~~ In file included from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:75:0, from user.cpp:1: /usr/include/c++/6/iostream:60:18: note: std::istream std::cin extern istream cin; /// Linked to standard input ^~~ user.cpp:24:9: error: reference to ‘cin’ is ambiguous cin >> x >> y; ^~~ user.cpp:4:10: note: candidates are: std::ifstream cin ifstream cin("dfs.in"); ^~~ In file included from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:75:0, from user.cpp:1: /usr/include/c++/6/iostream:60:18: note: std::istream std::cin extern istream cin; /// Linked to standard input ^~~ user.cpp:31:5: error: reference to ‘cout’ is ambiguous cout << c; ^~~~ user.cpp:5:10: note: candidates are: std::ofstream cout ofstream cout("dfs.out"); ^~~~ In file included from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:75:0, from user.cpp:1: /usr/include/c++/6/iostream:61:18: note: std::ostream std::cout extern ostream cout; /// Linked to standard output ^~~~