Compilare: user.cpp: In function ‘bool cuplaj(const int&)’: user.cpp:21:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp:33:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:77:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < A[i].size(); k ++) ^