Score : $100$ points

问题描述

给定一个序列 $P$，它是 $(1,2,\dots,N)$ 的一个排列，并给定一个整数 $X$。序列 $P$ 的第 $i$ 项的值为 $P_i$。请输出满足 $P_k = X$ 的 $k$ 值。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

You are given a sequence $P$ that is a permutation of $(1,2,…,N)$, and an integer $X$. The $i$-th term of $P$ has a value of $P_i$. Print $k$ such that $P_k = X$.

Constraints

• $1 \leq N \leq 100$
• $1 \leq X \leq N$
• $P$ is a permutation of $(1,2,…,N)$.
• All values in the input are integers.

Input

The input is given from Standard Input in the following format:

$N$ $X$

$P_1$ $P_2$ $\ldots$ $P_N$

Output

Print the answer.

Sample Input 1

4 3
2 3 1 4

Sample Output 1

2

We have $P = (2,3,1,4)$, so $P_2 = 3$. Thus, you should print $2$.

Sample Input 2

5 2
3 5 1 4 2

Sample Output 2

5

Sample Input 3

6 6
1 2 3 4 5 6

Sample Output 3

6

update @ 2024/3/10 11:38:53