Compilare: main.cpp: In function 'int main()': main.cpp:29:39: warning: converting to 'std::queue<std::pair<long int, int> >' from initializer list would use explicit constructor 'std::queue<_Tp, _Sequence>::queue(_Sequence&&) [with _Tp = std::pair<long int, int>; _Sequence = std::deque<std::pair<long int, int>, std::allocator<std::pair<long int, int> > >]' queue<pair<int64_t, int>> q[2] = {}; ^ main.cpp:29:39: note: in C++11 and above a default constructor can be explicit