Compilare: user.cpp: In function ‘int BFS(int, std::vector<int>*, int*, int*)’: user.cpp:58:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<la[v].size(); ++i) { ^ user.cpp: In function ‘int BFS2(int, std::vector<int>*, int*, int*, int*)’: user.cpp:83:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<la[v].size(); ++i) { ^ user.cpp:93:9: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^ user.cpp: In function ‘int BFS(int, std::vector<int>*, int*, int*)’: user.cpp:67:9: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^