Compilare: user.cpp: In function ‘void dfs(int, std::vector<int>*)’: user.cpp:13:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<a[nod].size(); i++){ ^ user.cpp: In function ‘void dfs1(int, std::vector<int>*)’: user.cpp:24:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<t[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:60:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<sol[i].size(); j++){ ^