> For the complete documentation index, see [llms.txt](https://jaywin.gitbook.io/leetcode/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jaywin.gitbook.io/leetcode/solutions/1056-confusing-number.md).

# 1056. Confusing Number

<https://leetcode.com/problems/confusing-number>

## Description

A **confusing number** is a number that when rotated `180` degrees becomes a different number with **each digit valid**.

We can rotate digits of a number by `180` degrees to form new digits.

* When `0`, `1`, `6`, `8`, and `9` are rotated `180` degrees, they become `0`, `1`, `9`, `8`, and `6` respectively.
* When `2`, `3`, `4`, `5`, and `7` are rotated `180` degrees, they become **invalid**.

Note that after rotating a number, we can ignore leading zeros.

* For example, after rotating `8000`, we have `0008` which is considered as just `8`.

Given an integer `n`, return `true` *if it is a **confusing number**, or* `false` *otherwise*.

**Example 1:**

![](https://assets.leetcode.com/uploads/2019/03/23/1268_1.png)

```
**Input:** n = 6
**Output:** true
**Explanation:** We get 9 after rotating 6, 9 is a valid number, and 9 != 6.
```

**Example 2:**

![](https://assets.leetcode.com/uploads/2019/03/23/1268_2.png)

```
**Input:** n = 89
**Output:** true
**Explanation:** We get 68 after rotating 89, 86 is a valid number and 86 != 89.
```

**Example 3:**

![](https://assets.leetcode.com/uploads/2019/03/26/1268_3.png)

```
**Input:** n = 11
**Output:** false
**Explanation:** We get 11 after rotating 11, 11 is a valid number but the value remains the same, thus 11 is not a confusing number
```

**Example 4:**

![](https://assets.leetcode.com/uploads/2019/03/23/1268_4.png)

```
**Input:** n = 25
**Output:** false
**Explanation:** We get an invalid number after rotating 25.
```

**Constraints:**

* `0 <= n <= 109`

## ac

```java
```


---

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