Compilare: main.cpp: In function 'void dfs(int)': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<vecin[k].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:78:13: warning: unused variable 'x' [-Wunused-variable] int x=v[i].nre; ^