View Compilation Error

0_0_17241733_5230.cpp:15:12: error: no matching function for call to 'node::node()'
 node a[maxn];
            ^
0_0_17241733_5230.cpp:15:12: note: candidates are:
0_0_17241733_5230.cpp:10:5: note: node::node(int, int)
     node (int xx,int hh){
     ^
0_0_17241733_5230.cpp:10:5: note:   candidate expects 2 arguments, 0 provided
0_0_17241733_5230.cpp:8:8: note: constexpr node::node(const node&)
 struct node{
        ^
0_0_17241733_5230.cpp:8:8: note:   candidate expects 1 argument, 0 provided
0_0_17241733_5230.cpp:8:8: note: constexpr node::node(node&&)
0_0_17241733_5230.cpp:8:8: note:   candidate expects 1 argument, 0 provided