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} }

Ëã·¨(¶þ) Void exchange ( BiTree root )

{

p=root; if ( p->LChild != NULL || p->RChild != NULL )

{

exchange ( p->LChild ); exchange ( p->RChild ); temp = p->LChild;

p->LChild = p->RChild;

p->RChild = temp; } }

temp = p->LChild;

p->LChild = p->RChild; p->RChild = temp;

exchange ( p->LChild ); exchange ( p->RChild );

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