Package g1301_1400.s1323_maximum_69_number

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    1323 - Maximum 69 Number.

    Easy

    You are given a positive integer num consisting only of digits 6 and 9.

    Return the maximum number you can get by changing at most one digit (6 becomes 9, and 9 becomes 6).

    Example 1:

    Input: num = 9669

    Output: 9969

    Explanation:

    Changing the first digit results in 6669.

    Changing the second digit results in 9969.

    Changing the third digit results in 9699.

    Changing the fourth digit results in 9666.

    The maximum number is 9969.

    Example 2:

    Input: num = 9996

    Output: 9999

    Explanation: Changing the last digit 6 to 9 results in the maximum number.

    Example 3:

    Input: num = 9999

    Output: 9999

    Explanation: It is better not to apply any change.

    Constraints:

    • <code>1 <= num <= 10<sup>4</sup></code>

    • num consists of only 6 and 9 digits.

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Integer maximum69Number(Integer num)

      • Methods inherited from class java.lang.Object

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