View Compilation Error

0_0_39594478_1405.cpp: In function 'int main()':
0_0_39594478_1405.cpp:19:16: error: 'a' was not declared in this scope
   19 |         memset(a,0,sizeof(Node)*MAXN);
      |                ^
0_0_39594478_1405.cpp:19:27: error: 'Node' was not declared in this scope
   19 |         memset(a,0,sizeof(Node)*MAXN);
      |                           ^~~~