Eroare de compilare: user.cpp: In function ‘void solve2()’: user.cpp:109:5: error: reference to ‘cout’ is ambiguous cout << 1 << ' ' << N << '\n'; ^ user.cpp:92:14: note: candidates are: std::ofstream cout ofstream cout("puzzle2.out"); ^ In file included from user.cpp:6:0: /usr/include/c++/4.8/iostream:61:18: note: std::ostream std::cout extern ostream cout; /// Linked to standard output ^ user.cpp:112:9: error: reference to ‘cout’ is ambiguous cout << node << ' '; ^ user.cpp:92:14: note: candidates are: std::ofstream cout ofstream cout("puzzle2.out"); ^ In file included from user.cpp:6:0: /usr/include/c++/4.8/iostream:61:18: note: std::ostream std::cout extern ostream cout; /// Linked to standard output ^ user.cpp:121:5: error: reference to ‘cout’ is ambiguous cout << end << '\n'; ^ user.cpp:92:14: note: candidates are: std::ofstream cout ofstream cout("puzzle2.out"); ^ In file included from user.cpp:6:0: /usr/include/c++/4.8/iostream:61:18: note: std::ostream std::cout extern ostream cout; /// Linked to standard output ^ user.cpp: In function ‘std::vector<int> bfs(int, std::vector<int>&)’: user.cpp:129:9: warning: unused variable ‘start’ [-Wunused-variable] int start = node, end = -1; ^ user.cpp: In function ‘void solve()’: user.cpp:176:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < path.size(); ++i) { ^ user.cpp:184:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < path.size(); ++i) { ^ user.cpp:188:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < path2.size(); ++i) { ^ user.cpp:193:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < path.size(); ++i) { ^ user.cpp:196:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < path2.size(); ++i) {