You are given two strings current and correct representing two timestamps in a $24$ hour format "HH:MM".

In a single operation, you can increase current by $1$, $5$, $15$, or $60$ minutes. You may apply this operation any number of times.

Return the minimum number of operations required to transform current into correct.

Constraints:

• current and correct are in the format "HH:MM"

• current $\leq$ correct

Now, let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.