View Compilation Error

0_0_30044693_28774.cpp:12:3: error: no matching function for call to 'Node::Node()'
 } buf;
   ^
0_0_30044693_28774.cpp:12:3: note: candidates are:
0_0_30044693_28774.cpp:8:5: note: Node::Node(int, int)
     Node(int hp, int id) : hp(hp), id(id) {}
     ^
0_0_30044693_28774.cpp:8:5: note:   candidate expects 2 arguments, 0 provided
0_0_30044693_28774.cpp:6:8: note: constexpr Node::Node(const Node&)
 struct Node {
        ^
0_0_30044693_28774.cpp:6:8: note:   candidate expects 1 argument, 0 provided
0_0_30044693_28774.cpp:6:8: note: constexpr Node::Node(Node&&)
0_0_30044693_28774.cpp:6:8: note:   candidate expects 1 argument, 0 provided