Compilare: main.cpp: In function 'bool dfs(int, int)': main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:66:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v2[k].size();++i) ~^~~~~~~~~~~~~ main.cpp:79:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();++i) g<<sol[i]<<' '; ~^~~~~~~~~~~