Compilare: main.cpp: In instantiation of 'RangeMinimumQuery<T>::RangeMinimumQuery(int, T (*)(T, T)) [with T = int]': main.cpp:62:44: required from here main.cpp:40:17: warning: 'RangeMinimumQuery<int>::f' will be initialized after [-Wreorder] T (*f) (T, T); ^ main.cpp:39:29: warning: 'std::vector<std::vector<int>, std::allocator<std::vector<int> > > RangeMinimumQuery<int>::table' [-Wreorder] vector < vector < T > > table; ^~~~~ main.cpp:8:5: warning: when initialized here [-Wreorder] RangeMinimumQuery (int _N, T (*_f) (T, T)): ^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("rmq.in", "r", stdin); ^ main.cpp:58:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("rmq.out", "w", stdout); ^ main.cpp:61:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &M); ^ main.cpp:65:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &x); ^ main.cpp:71:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &l, &r); ^