Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:17:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:41:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (used[i] != v[i].size()) ^ user.cpp:56:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < rasp[i].size(); ++j) ^