Eroare de compilare: user.cpp:7: error: expected initializer before 'vr' user.cpp: In function 'int main()': user.cpp:17: error: 'a' was not declared in this scope user.cpp:21: error: 'a' was not declared in this scope user.cpp:25: error: 'a' was not declared in this scope user.cpp: In function 'void BFS()': user.cpp:40: error: 'vr' was not declared in this scope user.cpp:40: error: 'vc' was not declared in this scope user.cpp:41: error: 'a' was not declared in this scope user.cpp:50: error: 'r' was not declared in this scope user.cpp:50: error: 'c' was not declared in this scope