# 0681. Next Closest Time

https://leetcode.com/problems/next-closest-time

## Description

Given a `time` represented in the format `"HH:MM"`, form the next closest time by reusing the current digits. There is no limit on how many times a digit can be reused.

You may assume the given input string is always valid. For example, `"01:34"`, `"12:09"` are all valid. `"1:34"`, `"12:9"` are all invalid.

**Example 1:**

```
**Input:** time = "19:34"
**Output:** "19:39"
**Explanation:** The next closest time choosing from digits **1**, **9**, **3**, **4**, is **19:39**, which occurs 5 minutes later.
It is not **19:33**, because this occurs 23 hours and 59 minutes later.
```

**Example 2:**

```
**Input:** time = "23:59"
**Output:** "22:22"
**Explanation:** The next closest time choosing from digits **2**, **3**, **5**, **9**, is **22:22**.
It may be assumed that the returned time is next day's time since it is smaller than the input time numerically.
```

**Constraints:**

* `time.length == 5`
* `time` is a valid time in the form `"HH:MM"`.
* `0 <= HH < 24`
* `0 <= MM < 60`

## ac

```java
```
