Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:22:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < A[P].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:55:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < A[postordine[i]].size(); j++) ^ user.cpp:74:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < A[postordine[i]].size(); j++) ^