Score : $100$ points

问题描述

Takahashi 参加了一次面试。

已知面试官的人数 $N$，以及一个长度为 $N$ 的字符串 $S$，表示面试官对他的评价。对于每个 $i=1,2,\ldots,N$，$S$ 中的第 $i$ 个字符代表第 $i$ 位面试官的评价；其中 o 表示好，- 表示一般，x 表示差。

Takahashi 通过面试的条件是同时满足以下两个条件，否则将失败：

• 至少有一位面试官给出的好评（Good）。
• 没有任何一位面试官给出差评（Poor）。

请确定 Takahashi 是否通过了面试。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

Takahashi had a job interview.

You are given the number of interviewers, $N$, and a string $S$ of length $N$ representing the interviewers' evaluations of him.
For each $i=1,2,\ldots,N$, the $i$-th character of $S$ corresponds to the $i$-th interviewer's evaluation; o means Good, - means Fair, and x means Poor.

Takahashi will pass if both of the following conditions are satisfied, and fail otherwise.

• At least one interviewer's evaluation is Good.
• No interviewer's evaluation is Poor.

Determine whether Takahashi passes.

Constraints

• $1 \leq N \leq 100$
• $S$ is a string of length $N$ consisting of o, -, and x.

Input

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

$N$

$S$

Output

If Takahashi passes, print Yes; otherwise, print No.

Sample Input 1

4
oo--

Sample Output 1

Yes

The first and second interviewers' evaluations are Good, and no interviewer's evaluation is Poor, so he passes.

Sample Input 2

3
---

Sample Output 2

No

No interviewer's evaluation is Good, so he fails.

Sample Input 3

1
o

Sample Output 3

Yes

Sample Input 4

100
ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooox

Sample Output 4

No

The $100$-th interviewer's evaluation is Poor, so he fails.

update @ 2024/3/10 12:21:25