题目描述
Given is $a permutation P_1, \ldots, P_N$ of $1, \ldots, N$.
Find the number of integers $i (1 \leq i \leq N)$ that satisfy the following condition:
- For any integer $j (1 \leq j \leq i), P_i \leq P_j$.
-----Constraints-----
- $1 \leq N \leq 2 \times 10^5$
- $P_1, \ldots, P_N$ is a permutation of $1, \ldots, N$.
- All values in input are integers.
-----Input-----
Input is given from Standard Input in the following format:
N
P_1 ... P_N
-----Output-----
Print the number of integers i that satisfy the condition.
-----Sample Input-----
5
4 2 5 1 3
-----Sample Output-----
3
i=1, 2, and 4 satisfy the condition, but i=3 does not - for example, P_i > P_j holds for j = 1.
Similarly, i=5 does not satisfy the condition, either. Thus, there are three integers that satisfy the condition.
输入格式
见题面
输出格式
见题面