Write a method to count the number of 2s that appear in all the numbers between 0 and n (inclusive).
Example:
Input: 25 Output: 9 Explanation: (2, 12, 20, 21, 22, 23, 24, 25)(Note that 22 counts for two 2s.)
Note:
n <= 10^9
Write a method to count the number of 2s that appear in all the numbers between 0 and n (inclusive).
Example:
Input: 25 Output: 9 Explanation: (2, 12, 20, 21, 22, 23, 24, 25)(Note that 22 counts for two 2s.)
Note:
n <= 10^9