Compilare: user.cpp: In function ‘int main()’: user.cpp:47:9: warning: unused variable ‘w’ [-Wunused-variable] int w; ^ user.cpp: In function ‘int bfs(int)’: user.cpp:91:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[x].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:63:30: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << mini << " " << mid; ^