Sword finger offer17- print from 1 to the maximum n digits - Analog

Original link

The code is as follows ：

class Solution {
    
public:
    vector<int> printNumbers(int n) {
    
        int m = 9;
        vector<int> ans;
        if(n == 0)  return ans;
        for(int i = 2; i <= n; i ++){
    
            m = m * 10 + 9;
        }
        for(int i = 1; i <= m; i ++)
            ans.push_back(i);
        return ans;
    }
};