Compilare: main.cpp: In instantiation of 'SparseTable<T>::SparseTable(std::vector<_Tp>&, std::function<T(const T&, const T&)>) [with T = long long int]': main.cpp:87:70: required from here main.cpp:64:37: warning: 'SparseTable<long long int>::f' will be initialized after [-Wreorder] function<T(const T&, const T&)> f; ^ main.cpp:63:23: 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:65:5: warning: when initialized here [-Wreorder] SparseTable(vector<T> &a, function<T(const T&, const T&)> f) : f(f), table(a.size(), vector<T>(maxlog)) { ^~~~~~~~~~~ main.cpp:66:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); ++i) { main.cpp:70:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j + (1 << (i + 1)) <= a.size(); ++j) { main.cpp: In function 'int main()': main.cpp:143:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ksecv4.in", "r", stdin); ^ main.cpp:144:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ksecv4.out", "w", stdout); ^