struct?TriTreeNode
{
TriTreeNode?*LeftChild;
TriTreeNode?*RightChild;
TriTreeNode?*BaseNeighbor;
TriTreeNode?*LeftNeighbor;
TriTreeNode?*RightNeighbor;
};????//有一個結構體定義如上所述
if?(tri->LeftChild)
if?(!tri->LeftChild)
if?(tri->LeftChild?!=?NULL)???//這三種條件應該怎么理解，條件1和3有區別么
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