( 4 )已知一个栈的进栈序列是 1 , 2 , 3 ,..., n ,其输出序列的第一个元素是 i ( 1 ≤ i ≤ n )则第 j ( 1 ≤ j ≤ n )个出栈元素是( )。
A.
i
B.
n - i
C.
j - i +1
D.
不确定
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