Compilare: user.cpp: In function ‘std::pair<int, std::vector<int> > reduceTrie(Trie*, int)’: user.cpp:39:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < right.second.second.size(); i++) ^ user.cpp:46:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < right.second.second.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:86:56: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 2 has type ‘int’ [-Wformat=] printf("%lld\n", reduceTrie(trieRoot, 20).first); ^ user.cpp:73:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("yamstp.out", "w", stdout); ^