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#18781. 序列与查询23

통계

给定一个长度为 $N$ 的数列 $A_1, A_2, \ldots, A_N$。请编写一个程序来处理以下查询:

  • s e:输出满足 $s \le i < j \le e$ 且 $A_i > A_j$ 的 $(i, j)$ 对的个数。($1 \le s \le e \le N$)

输入格式

第一行包含数列的长度 $N$ ($1 \le N \le 100{,}000$) 和查询的个数 $M$ ($1 \le M \le 100{,}000$)。

第二行包含 $A_1, A_2, \ldots, A_N$。($1 \le A_i \le 1{,}000{,}000{,}000$)

接下来 $M$ 行,每行包含一个查询。

输出格式

对于每个查询,输出其答案,每个答案占一行。

样例

样例输入 1

5 3
1 4 2 3 1
1 2
3 5
1 5

样例输出 1

0
2
5

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