再次排列 - Problème

#3918. 再次排列

Statistiques

AI Translation — This statement was translated using AI and may contain inaccuracies. Please refer to the original statement if in doubt.

给定一个包含 $N$ 个整数的序列 $A_i$。求满足子段 $\{A_L, A_{L+1}, \dots, A_R\}$ 是一个 $R - L + 1$ 的排列的数对 $(L, R)$ 的数量。

$K$ 的排列是指任何由 $1$ 到 $K$ 组成的序列，其中每个元素仅出现一次。

输入格式

第一行包含一个数字 $N$ —— 序列长度。第二行包含 $N$ 个整数 —— 序列 $A_i$ 的元素。

数据范围

$1 \le N \le 10^6$ $1 \le A_i \le N$

输出格式

输出满足条件的数对 $(L, R)$ 的数量。

样例

样例输入 1

3
3 1 2

样例输出 1

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