View Compilation Error

0_0_36667244_30548.cpp: In function 'void buildtree(int, int, int&, node*&)':
0_0_36667244_30548.cpp:27:29: error: no matching function for call to 'node::node(int&)'
     root = new node(in[flag]);
                             ^
0_0_36667244_30548.cpp:27:29: note: candidates are:
0_0_36667244_30548.cpp:8:8: note: node::node()
 struct node
        ^
0_0_36667244_30548.cpp:8:8: note:   candidate expects 0 arguments, 1 provided
0_0_36667244_30548.cpp:8:8: note: constexpr node::node(const node&)
0_0_36667244_30548.cpp:8:8: note:   no known conversion for argument 1 from 'int' to 'const node&'
0_0_36667244_30548.cpp:8:8: note: constexpr node::node(node&&)
0_0_36667244_30548.cpp:8:8: note:   no known conversion for argument 1 from 'int' to 'node&&'