Compilare: user.cpp: In function ‘void RemoveLinks(int)’: user.cpp:36:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[id].kids.size();i++) ^ user.cpp: In function ‘void interpret(char*, Pair*, int)’: user.cpp:44:17: warning: unused variable ‘ov’ [-Wunused-variable] bool coef=1,ov=0; ^ user.cpp: In function ‘int main()’: user.cpp:124:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i< tmp->_coef.size();i++) ^ user.cpp:127:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i< tmp->kids.size();i++) ^