Thank you very much mate! That is the reason.
在 2020年4月14日星期二 UTC+8上午3:35:11，porker2008写道：
>
> if (ne > -1) {
> System.out.println(ne + 1);
> bit = input.nextInt();
> ne_change = a[ne] != bit;
> i++; // removing this line
> } else {
> System.out.println("1");
> bit = input.nextInt();
> }
>
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