View Compilation Error

0_0_3019921_30119.cpp: In function `int main()':
0_0_3019921_30119.cpp:65: error: `Node' undeclared (first use this function)
0_0_3019921_30119.cpp:65: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3019921_30119.cpp:65: error: expected `;' before "H"