View Compilation Error

0_0_38313394_25407.cpp:7:8: error: 'N' was not declared in this scope
 } node[N];
        ^
0_0_38313394_25407.cpp:8:7: error: 'N' was not declared in this scope
 int G[N];
       ^
0_0_38313394_25407.cpp: In function 'int main()':
0_0_38313394_25407.cpp:24:16: error: 'G' was not declared in this scope
         memset(G, 0, sizeof(G));
                ^
0_0_38313394_25407.cpp:25:16: error: 'node' was not declared in this scope
         memset(node, 0, sizeof(node));
                ^