Solution (leetcode-in-java 1.19 API)

java.lang.Object
- g2401_2500.s2437_number_of_valid_clock_times.Solution

```
public class Solution
extends Object
```
2437 - Number of Valid Clock Times.
Easy

You are given a string of length 5 called time, representing the current time on a digital clock in the format "hh:mm". The earliest possible time is "00:00" and the latest possible time is "23:59".

In the string time, the digits represented by the ? symbol are unknown , and must be replaced with a digit from 0 to 9.

Return an integer answer, the number of valid clock times that can be created by replacing every ?with a digit from 0 to 9.

Example 1:

Input: time = “?5:00”

Output: 2

Explanation: We can replace the ? with either a 0 or 1, producing “05:00” or “15:00”. Note that we cannot replace it with a 2, since the time “25:00” is invalid. In total, we have two choices.

Example 2:

Input: time = “0?:0?”

Output: 100

Explanation: Each ? can be replaced by any digit from 0 to 9, so we have 100 total choices.

Example 3:

Input: time = “??:??”

Output: 1440

Explanation: There are 24 possible choices for the hours, and 60 possible choices for the minutes. In total, we have 24 * 60 = 1440 choices.

Constraints:
- time is a valid string of length 5 in the format "hh:mm".
- "00" <= hh <= "23"
- "00" <= mm <= "59"
- Some of the digits might be replaced with '?' and need to be replaced with digits from 0 to 9.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  Solution()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  int countTime(String time)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- Solution
```
public Solution()
```

Method Detail
- countTime
```
public int countTime(String time)
```