View Compilation Error

0_0_14236081_31116.cpp: In function 'int main()':
0_0_14236081_31116.cpp:75:22: error: 'nn' was not declared in this scope
    if (x) set(root,0,nn,y-1,z);
                      ^
0_0_14236081_31116.cpp:76:37: error: 'nn' was not declared in this scope
    else printf("%I64d\n",get(root,0,nn,y-1,z-1).getmax());
                                     ^