Compilare: user.cpp: In function ‘void DF(int, int, int)’: user.cpp:22:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[nod].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:55:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol1.size(); i++) { ^ user.cpp:60:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol2.size(); i++) ^