0_0_14834503_1363.cpp: In member function 'int Node::lson()':
0_0_14834503_1363.cpp:18:3: error: 'tree' was not declared in this scope
tree[++tot].clear();
^
0_0_14834503_1363.cpp: In member function 'int Node::rson()':
0_0_14834503_1363.cpp:24:3: error: 'tree' was not declared in this scope
tree[++tot].clear();
^
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