[Sword refers to offer.17] Print from 1 to the largest n digits

topic:

Enter the number n, and print out in order from 1 to the largest n-digit decimal number. For example, input 3, then 1, 2, 3 will be printed out up to the maximum 3 digits 999.

Example 1:

Input: n = 1
Output: [1,2,3,4,5,6,7,8,9]

Description:

• Instead of printing, return a list of integers
• n is a positive integer

Code:

class Solution {
    public int[] printNumbers(int n) {
       int[] out=new int[(int)(Math.pow(10,n))-1];
        for(int i=1;i<(Math.pow(10,n));i++){
          out[i-1]=i;
        }
       return out;
    }
}

Friends who don’t know the square root can see here: rounding, random number, square root, power, π, natural constant