Compilare: user.cpp: In function ‘bool bfs(int, int*, int**, int**)’: user.cpp:59:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < V[c].size(); i++) ^ user.cpp: In function ‘void bfs2(int, int*, int**, int**, int, int)’: user.cpp:89:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < V[n].size(); i++) ^ user.cpp: In function ‘void flow(int, int**)’: user.cpp:115:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < V[sink].size(); i++) ^