序列与查询 38 - 题目

#18796. 序列与查询 38

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最初有一个包含一个 0 的数组 $A$。接下来需要执行以下查询：

1 x：在 $A$ 的末尾添加 x。
2 x：从 $A$ 中删除 x。如果 $A$ 中有两个或更多个 x，则只删除最前面出现的一个。保证查询中 $A$ 中一定包含 x。
3：输出 $A$ 中所有元素的和。
4：输出 $A$ 中所有元素的异或值。

输入格式

第一行包含一个整数 $M$，表示查询的数量。接下来 $M$ 行，每行一个查询。

输出格式

每当出现类型 3 或类型 4 的查询时，输出答案，每个答案占一行。

样例

输入样例 1

输出样例 1

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