①处应填()
cur<upper bound
cur<=upper bound
cur>upper bound
cur>=upper bound
②处应填()
left child
right child
alroot].left child
alroot .right child
③处应填()
left child
right child
cur+1
cur
④处应填( )
left child
upper bound-1
right child
upper bound
⑤处应填( )
-1
0
1
2
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