Compilare: user.cpp: In function ‘bool BFS(int)’: user.cpp:37:38: 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:60:39: 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:87:29: 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]); ^ user.cpp: In function ‘int main()’: user.cpp:133:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<solv.size();++i) g<<solv[i]<<"\n"; ^ user.cpp:92:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^