①处应填( )
0
n
1
-1
②处应填( )
1
2
n
0
③处应填(
stack2[top2]=stackl[top1]
top1=top2
stack2[top1]=stackl[top1]
stack2[top1]=stack1[top2]
④处应填()
stackl[top1]=stack2[top1]
stackl[top2]-stack2[top1]
stackl[top1]=stack2[top2]
stack1[top2]-stack2[top2]
⑤处应填()
top1
top2
top1-1
top2-1
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