View Compilation Error

0_0_29088081_23456.cpp: In member function 'void treenode::mergeQuery(int)':
0_0_29088081_23456.cpp:51:20: error: 'nodes' was not declared in this scope
   maxv = max(maxv, nodes[p].maxv);
                    ^
0_0_29088081_23456.cpp: In member function 'void treenode::updateFromSon()':
0_0_29088081_23456.cpp:55:10: error: 'nodes' was not declared in this scope
   maxv = nodes[lson()].maxv;
          ^