Compilare: user.cpp: In function ‘void RemoveLinks(int)’: user.cpp:37:35: 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:46:17: warning: unused variable ‘ov’ [-Wunused-variable] bool coef=1,ov=0; ^ user.cpp: In function ‘int main()’: user.cpp:122:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i< tmp->_coef.size();i++) ^ user.cpp:125:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i< tmp->kids.size();i++) ^