Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:44:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[x].size();++i) if(viz[G[x][i]] != ok) ^ user.cpp: In function ‘void Bellman()’: user.cpp:75:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();++i) if(F[x][v[x][i]] < Cap[x][v[x][i]] && d[v[x][i]] > d[x] + Cst[x][v[x][i]]) ^ user.cpp: In function ‘int main()’: user.cpp:142:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[x].size();++i) ^ user.cpp:164:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[x].size();++i) if(w2[i+1] != -1) ^ user.cpp:177:23: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while(cost = Flux()) cmin += cost; ^