Compilare: user.cpp: In function ‘void BKTR(int, long long int)’: user.cpp:14:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lvl>=Div.size() || Div.empty()) ^ user.cpp: In function ‘int main()’: user.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ANS.size();++i) ^ user.cpp:62:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ANS.size();++i) ^