Compilare: user.cpp: In member function ‘void Trie::add(std::string&, int)’: user.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) { ^ In file included from /usr/include/c++/4.8/cassert:43:0, from user.cpp:5: user.cpp: In function ‘int main()’: user.cpp:84:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(strlen(sir) == p); ^ user.cpp:95:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(strlen(sir) == p); ^ user.cpp:68:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sabin.in", "rt", stdin); ^ user.cpp:69:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sabin.out", "wt", stdout); ^