Compilare: user.cpp: In function ‘bool BFS(int)’: user.cpp:36:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s!=D) for(i=0;i<v[s].size();++i) if(!viz[v[s][i]] && F[s][v[s][i]] < C[s][v[s][i]]) ^ user.cpp: In function ‘void Flow()’: user.cpp:59:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(BFS(S)) for(i=0;i<v[D].size();++i) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:89:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) if(C[x][v[x][i]] != F[x][v[x][i]] && !mark[v[x][i]]) DFS(v[x][i]); ^