Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:21:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[k].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:48:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v[i].size(); j++) ^ user.cpp:87:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ;j < v[i].size(); j++) ^ user.cpp:94:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v[n].size(); j++) ^