View Compilation Error

0_0_36494434_28878.cpp: In function 'void change(int, int, int)':
0_0_36494434_28878.cpp:3:8: error: 'node' was not declared in this scope
     if(node[i].l==node[i].r)
        ^
0_0_36494434_28878.cpp:8:14: error: 'node' was not declared in this scope
     int mid=(node[i].l+node[i].r)/2;
              ^