1736. Latest Time by Replacing Hidden Digits

https://leetcode.com/problems/latest-time-by-replacing-hidden-digits

Description

You are given a string time in the form of hh:mm, where some of the digits in the string are hidden (represented by ?).

The valid times are those inclusively between 00:00 and 23:59.

Return the latest valid time you can get from time by replacing the hidden digits.

Example 1:

**Input:** time = "2?:?0"
**Output:** "23:50"
**Explanation:** The latest hour beginning with the digit '2' is 23 and the latest minute ending with the digit '0' is 50.

Example 2:

**Input:** time = "0?:3?"
**Output:** "09:39"

Example 3:

**Input:** time = "1?:22"
**Output:** "19:22"

Constraints:

• time is in the format hh:mm.

• It is guaranteed that you can produce a valid time from the given string.

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