Compilare: user.cpp: In function ‘void bfs(std::vector<std::list<int, std::allocator<int> >, std::allocator<std::list<int, std::allocator<int> > > >&, int)’: user.cpp:16: warning: unused variable ‘i’ user.cpp:16: warning: unused variable ‘len’ user.cpp: In function ‘int main()’: user.cpp:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result