Maximum 69 Number
Easy
You receive a positive integer num consisting only of digits 6 and 9.
Find and provide 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 largest number is 9969.
Example 2
Input: num = 9996
Output: 9999
Explanation: Changing the last digit 6 to 9 results in the largest number.
Example 3
Input: num = 9999
Output: 9999
Explanation: It is better not to apply any change.
Constraints
1 <= num <= 10^4numconsists of only6and9digits.
Did this problem appear in one of your interviews?
Responses stay private.