Compilare: user.cpp: In function ‘void ins(Trie*, int, int)’: user.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p == aux.size()) ^ user.cpp: In function ‘void precalc()’: user.cpp:69:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v.size() ; ++i){ ^