Compilare: user.cpp: In function ‘void bfs(node)’: user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:134: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long int’ user.cpp:134: warning: format ‘%02d’ expects type ‘int’, but argument 4 has type ‘long int’ user.cpp:105: warning: ‘start’ may be used uninitialized in this function