Compilare: user.cpp: In function ‘int bfs(int, int)’: user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[s].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:48:10: warning: variable ‘z’ set but not used [-Wunused-but-set-variable] int n,a,z; ^ user.cpp: In function ‘int bfs(int, int)’: user.cpp:43:9: warning: ‘z’ may be used uninitialized in this function [-Wmaybe-uninitialized] return z; ^