View Compilation Error

0_0_20691814_3542.cpp:79:16: error: no matching function for call to 'node::node()'
 } p[maxn * maxm];
                ^
0_0_20691814_3542.cpp:79:16: note: candidates are:
0_0_20691814_3542.cpp:72:2: note: node::node(int, int, int)
  node(int a, int x, int y) : a(a), x(x), y(y) {}
  ^
0_0_20691814_3542.cpp:72:2: note:   candidate expects 3 arguments, 0 provided
0_0_20691814_3542.cpp:67:8: note: constexpr node::node(const node&)
 struct node
        ^
0_0_20691814_3542.cpp:67:8: note:   candidate expects 1 argument, 0 provided
0_0_20691814_3542.cpp:67:8: note: constexpr node::node(node&&)
0_0_20691814_3542.cpp:67:8: note:   candidate expects 1 argument, 0 provided