Package g2401_2500.s2437_number_of_valid_clock_times

Class Solution

java.lang.Object
g2401_2500.s2437_number_of_valid_clock_times.Solution
public class Solution extends java.lang.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

    Modifier and Type
    Method
    Description
    int
    countTime(java.lang.String time)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • countTime

      public int countTime(java.lang.String time)