Compilare: main.cpp: In function 'void dfs(int)': main.cpp:26:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[ns].size();i++) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:41:29: warning: variable 'u' set but not used [-Wunused-but-set-variable] struct nod{int x;int y;}u[nr+2];int contor=1; ^