Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=nr;i++){for(j=0;j<sol[i].size();j++) fout<<sol[i][j]<<" "; fout<<"\n";} ~^~~~~~~~~~~~~~