Next Closest Time
We can simulate the clock going forward by one minute at a time, and we’ll check whether the current time can be represented by the digits in the input time. We’ll continue doing this until we find the next valid time. Here’s the stepbystep process:
 Parse the Input: Extract the digits from the input time, and store them in a set for quick access.
 Initialize Current Time: Start from the given time.
 Increment Time: Increment the time by one minute, and wrap around to “00:00” if we pass “23:59”.
 Check Validity: Check if the new time consists of the same digits as the given time.
 Repeat: Repeat steps 34 until we find the valid time.
Here’s the code:


The time complexity of this code is (O(1)) since the while loop will run at most 1440 times (the number of minutes in a day), and the space complexity is also (O(1)).