Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:27:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nou].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:72:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a[x].size();j++) ^ user.cpp:38:12: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] {int x,y,i,r; ^