Compilare: main.cpp: In instantiation of 'SparseTable<T>::SparseTable(std::vector<_Tp>&, T (*)(const T&, const T&)) [with T = long long int]': main.cpp:99:39: required from here main.cpp:66:29: warning: 'SparseTable<long long int>::f' will be initialized after [-Wreorder] T(*f)(const T&, const T&); ^ main.cpp:64:23: warning: 'std::vector<std::vector<long long int>, std::allocator<std::vector<long long int> > > SparseTable<long long int>::table' [-Wreorder] vector<vector<T>> table; ^~~~~ main.cpp:67:5: warning: when initialized here [-Wreorder] SparseTable(vector<T> &a, T(*f)(const T&, const T&))//; function<T(const T&, const T&)> &f) ^~~~~~~~~~~ main.cpp:70:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); ++i) { main.cpp:74:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j + (1 << (i + 1)) <= a.size(); ++j) {