View Compilation Error

0_0_38023103_9134.cpp:41:11: error: no matching function for call to 'node::node()'
 }tr[N << 2];
           ^
0_0_38023103_9134.cpp:41:11: note: candidates are:
0_0_38023103_9134.cpp:38:5: note: node::node(int, int, int, int, int, int)
     node(int x1,int x2,int x3,int x4,int x5,int x6 ) {
     ^
0_0_38023103_9134.cpp:38:5: note:   candidate expects 6 arguments, 0 provided
0_0_38023103_9134.cpp:33:8: note: constexpr node::node(const node&)
 struct node{
        ^
0_0_38023103_9134.cpp:33:8: note:   candidate expects 1 argument, 0 provided
0_0_38023103_9134.cpp:33:8: note: constexpr node::node(node&&)
0_0_38023103_9134.cpp:33:8: note:   candidate expects 1 argument, 0 provided